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This is a partial list of the British Air Ministry (AM) specifications for aircraft. A specification stemmed from an Operational Requirement, abbreviated "OR", describing what the aircraft would be used for. This in turn led to the specification itself, e.g. a two-engined fighter with 4 machine guns. So for example, OR.40 for a heavy bomber led to Specification B.12/36. Aircraft manufacturers would be invited to present design proposals to the Ministry, following which prototypes of one or more of the proposals might be ordered for evaluation. On very rare occasions, a manufacturer would design and build an aircraft using their own money as a "Private Venture" (PV). This would then be offered to the Ministry for evaluation. If the aircraft generated interest in the Ministry or RAF due to performance or some other combination of features then the Ministry might well issue a specification based on the Private Venture aircraft.

The system of producing aircraft to a specification ran from 1920 to 1949 during which the Air Ministry was replaced by first the Ministry of Aircraft Production (MAP) and then the Ministry of Supply (MoS). The system was applied to commercial aircraft as well, two being the de Havilland Comet and Vickers Viscount. During the period, over 800 specifications were issued.

Specification designations

Each specification name usually followed a pattern. A leading letter was usually present to identify the aircraft purpose. The codes used included B for "heavy bomber", e.g., B.12/36, P for "medium bomber", e.g., P.13/36, F for "fighter", e.g., F.10/35, and A for "army co-operation", e.g., A.39/34. The second part was a number identifying it in sequence and then after the slash, the year it was formulated, so in the example given above, B.12/36 signifies a specification for a heavy bomber, the twelfth specification of all types issued in 1936. Specifications were not always issued in sequence.

Admiralty specifications were identified by the letter N (Naval), e.g., N.21/45, and experimental specifications identified by the letter E (Experimental), e.g., E.28/39, with training aircraft signified by the letter T (Training), e.g., T.23/31, and unpowered aircraft, signified by the letter X, e.g., X.26/40. The letter G (General) signified a general-purpose aircraft, e.g., G.9/45, with an M (Multi-role) being applied to aircraft intended for more than one specific purpose, e.g., M.15/35.

The letter C (Cargo) was applied to military transport aircraft, e.g., C.1/42, with the letter O (Observation) used for a naval reconnaissance aircraft, e.g., O.8/38 - the letter S (Spotter) used for the more specialised role of naval spotting, i.e., observing and reporting back the fall of naval gunfire, e.g., S.38/34 - and R (Reconnaissance) for a reconnaissance type - often a flying boat, e.g., R.3/33. Special purpose aircraft would be signified by a letter Q, this being used to specify aircraft such as target-tugs, radio-controlled target drones, etc., e.g., Q.32/55.

Sometimes the purpose for which an aircraft is used in service would change from that for which the specification to which it was designed was issued, and so there are some discrepancies and inconsistencies in designation, the Royal Navy in particular liking to specify multiple roles for its aircraft in an attempt to make the best use of the necessarily limited hangar space onboard its aircraft carriers. In this case this resulted in several types designed to specifications originally intended to signify the naval Spotting role also being used for other purposes, e.g., S.15/33, resulting in the Blackburn Shark and Fairey Swordfish, the latter aircraft being primarily utilised as a torpedo bomber. Similarly S.24/37, which produced the Fairey Barracuda, again primarily designed for spotting, the dive bomber/torpedo bomber requirements being regarded as secondary when the specification was issued, but for which roles it was almost exclusively subsequently used, the original spotting requirement having been made obsolete with the introduction of radar.

In addition, some (mostly early) specifications appear to have no letter prefix at all, e.g., 1/21, the Vickers Virginia III.

List of specifications (incomplete)

The names of the aircraft shown in the table are not necessarily those they carried when provided for evaluation as at this point an aircraft would usually be referred-to as the Manufacturer X.XX/XX, e.g., the Avro B.35/46 - this is in addition to the manufacturer's own separate internal designation for the aircraft, e.g., Avro 698. With several manufacturers submitting designs to the same specification this could result in a number of different aircraft with the same X.XX/XX designation, e.g., Handley Page B.35/46, etc.

Upon acceptance of the design(s) the final service names would usually be chosen by the Air Ministry when they placed a production order, in the above B.35/46 cases, where two aircraft were accepted to this specification, Vulcan and Victor respectively.

Upon entering service, in the absence of any already-planned variants a new type would initially have no Mark Number after the aircraft name, being simply referred-to as the Manufacturer Service-name, e.g., the Avro Anson, however upon acceptance of a new variant the previous (initial) version automatically became the 'Mark I', so in the example given, the previous (first) version of the Anson retrospectively became the Avro Anson Mk I upon acceptance of an Avro Anson Mk II. Sometimes planned variants would be later cancelled leading to 'missing' Mark Numbers, or the extent of the changes may have justified given the new variant a completely new name, e.g., the Hawker Typhoon II subsequently becoming the Hawker Tempest, or the Avro Lancaster B.IV & B.V entering service as the Avro Lincoln. In a few cases the same aircraft ordered with differing engines would be allocated separate names for each variant, e.g., Hawker Typhoon and Hawker Tornado, or the Handley Page Hampden and Handley Page Hereford. Typographical designation of Mark Numbers (Mk.) varied over time and inconsistencies are common, e.g., Mark II, Mk. II, II, etc. Initially Roman numerals were used, changing to Arabic numerals post-World War II, e.g., Supermarine Spitfire Mk I to Supermarine Spitfire Mk 24.

Note 1: where possible Mark Numbers are given here in this list in the form that was used at the time of acceptance. Variations may be encountered due to changes in format/typographical convention over time.

Note 2: due to mergers and amalgamations within the UK aircraft industry sometimes the name of the manufacturer changed over time, e.g., English Electric later became part of the British Aircraft Corporation (BAC), so the English Electric Lightning then became the BAC Lightning; the British Aircraft Corporation itself and Hawker Siddeley (HS) then later merged and became British Aerospace, subsequently becoming BAe (now BAE Systems). Thus the previously mentioned Avro Vulcan was subsequently referred-to as the Hawker Siddeley Vulcan; similarly, the Blackburn Buccaneer later became the Hawker Siddeley Buccaneer. Where possible, for clarity the aircraft in this list are listed under the ORIGINATING company's name or the name of the manufacturer under which it first entered production.

Specifications within the tables are listed in numerical order by year of issue; where a given number appears more than once, with one or more letter prefixes, the entries are presented in alphabetical order.

Air Board Specifications (1917–1918)

In 1917, the Air Board began to issue specifications for new aircraft on behalf of the Royal Flying Corps and Royal Navy,[1] with separate series for the RFC and Navy.[2]

RFC Series
Spec. Type Designs (accepted and tendered)
A.1A Single seat fighter - Sopwith Camel replacement[3] Austin Osprey,[4] Boulton & Paul Bobolink,[3] Nieuport B.N.1,[5] Sopwith Snipe[6]
A.1C Single seat fighter - ABC Dragonfly engine, became RAF Type I specification.[7] Nieuport Nighthawk
A.2B Single- or twin-engined day bomber[8] Airco DH.10
A.3C Heavy bomber - superseded by RAF Type V[9] Abandoned
Royal Navy Series
Spec. Type Designs (accepted and tendered)
N.1A Single seat land or ship-based fighter.[10] Beardmore W.B.IV,[11] Beardmore W.B.V,[12] Mann Egerton Type H[10]
N.1B Single seat seaplane or flying boat fighter[13] Blackburn N.1B,[14] Norman Thompson N.1B,[1] Supermarine Baby,[14] Westland N.1B,[15] Wight Triplane Flying Boat[1]
N.1B Single seat torpedo bomber[16] Blackburn Blackburd,[17] Short Shirl[16]
N.2A Two-seat floatplane scout[18] Fairey N.9,[19] Fairey N.10,[20] Short N.2A[18]
N.2B Two-seat floatplane bomber, 600 lb (270 kg) bombload.[21] Fairey IIIB,[21] Short N.2B[22]
N.2C Twin engined patrol flying boat[23] Norman Thompson N.2C

RAF Specifications (1918–1920)

Spec. Type Designs (accepted and tendered)
Type I Fighter, ABC Dragonfly engine.[7] Armstrong Whitworth Ara, BAT Basilisk, Nieuport Nighthawk,[7] Siddeley Siskin,[24] Sopwith Snapper,[25] Sopwith Snark[26]
Type IA Long-distance (high altitude) BAT Bantam, Westland Wagtail
Type II Two-seat fighter Bristol Badger
Type III Two-seat fighter Austin Greyhound, Westland Weasel
Type IV
Type VI
Twin-engined bomber Avro 533 Manchester, Boulton Paul Bourges, de Havilland Oxford, Sopwith Cobham
Type VII Night Bomber Nieuport London
Type VIII Bomber Avro 533 Manchester, Boulton Paul Bourges, Bristol Braemar, de Havilland Oxford, Sopwith Cobham
Type IX Medium bomber de Havilland Okapi
Type XI Heavy bomber Siddeley Sinaia
Type XX Gloster Nightjar
Type XXI Two-seat amphibian fighter Bristol Type 35, Fairey Pintail
Type XXII Single-seat carrier based torpedo bomber (re-issued 1920) Blackburn Blackburd, Short Shirl, Blackburn Swift
Type XXX Flying boat[1] Short Cromarty, Vickers Valentia
Type XXXII Prototype training seaplane[27] (cancelled 1918) - Short Sporting Type produced to this specification
Type XXXIII Four-engined long range flying boat[1] Fairey N.4


Spec. OR Type Designs (accepted and tendered)
1/20 None First spec. issued: spares carrier Bristol Type 37 Tramp
2/20 'Interim' single-engine heavy bomber Avro Aldershot, De Havilland DH.27 Derby
3/20 Single-seat deck-landing torpedo-carrier - Spec. superseded by 32/22 (q.v.) Blackburn Dart (modified), Handley Page H.P.19 Hanley
4/20 Long-distance photographic and reconnaissance aeroplane Boulton & Paul Bolton
5/20 Troop Carrier Biplane Bristol Type 56, Vickers Victoria
6/20 Vimy Ambulance Vickers Vimy Ambulance
7/20 Fleet reconnaissance and fleet spotting amphibian[1] Supermarine Seagull
8/20 3-seat reconnaissance aircraft for Army/Navy Armstrong Whitworth Tadpole, Westland Walrus
9/20 Medium range postal monoplane Parnall Possum, Boulton & Paul Bodmin
10/20 Cantilever monoplane de Havilland Doncaster
11/20 Parnall Possum, Boulton & Paul Bodmin
1/21 Long-range bomber - Vimy replacement Vickers Virginia III
2/21 Experimental single-seat convertible biplane/monoplane fighter/interceptor/two-seat reconnaissance-fighter aircraft - written for Bullfinch Bristol Bullfinch
3/21 Naval Fleet spotter/reconnaissance aircraft Avro Bison, Blackburn Blackburn
5/21 Light day bomber - DH.9A replacement Fairey Fawn
7/21 Parnall Plover
12/21 Fleet spotting flying boat[28] English Electric Ayr[1]
13/21 Handley Page H.P.20
14/21 Felixstowe F.5 replacement[29] Supermarine Scylla
19/21 Two-seat reconnaissance aircraft - Bristol Fighter replacement Short Springbok
21/21 Supermarine Seagull II[1]
1/22 Vickers Vanguard
2/22 Vickers Viking V[1]
3/22 Two-seat fighter/reconnaissance powered by a supercharged engine - Bristol Fighter replacement Bristol Bloodhound
6/22 Naval carrier fighter with interchangeable wheel & float undercarriages using Jaguar or Jupiter engine - Nightjar replacement Fairey Flycatcher, Parnall Plover
7/22 Army reconnaissance aircraft Hawker Duiker
14/22 Armstrong Whitworth Siskin III
15/22 Fighter/interceptor Armstrong Whitworth Siskin III
16/22 Long range Torpedo Bomber to carry 21 inch torpedo Blackburn Cubaroo, Avro 557 Ava
20/22 English Electric P.5 Cork[1]
21/22 Twin-engined amphibian flying boat for civil operations[30] - see also R.18/24[31] Supermarine Swan
22/22 Two-seat fighter/reconnaissance powered by a supercharged engine - Bloodhound three aircraft order - revised from 3/22 (q.v.) Bristol Bloodhound
25/22 Single-seat night interceptor fighter Hawker Woodcock
30/22 Boulton & Paul Bugle
B.30/22 Heavy bomber - written for Bugle II production order but Sidestrand also apparently designed to this spec. Boulton Paul Bugle II, Boulton Paul Sidestrand
31/22 4-seat heavy night-bomber Handley Page Hyderabad
32/22 Single-seat deck-landing torpedo-carrier - Spec. supersedes 3/20 (q.v.) Blackburn Dart II, Bristol Brandon
37/22 Three-seat deck landing reconnaissance aircraft - Blackburn/Bison replacement Blackburn Airedale, Hawker Hedgehog
38/22 General Purpose seaplane/landplane Fairey IIID
40/22 Transport aeroplane - civil airliner - larger version of DH.34 de Havilland Highclere
41/22 'Middle East type transport aeroplane' - civil airliner Armstrong Whitworth Argosy, de Havilland Hercules
43/22 Vickers Vernon II
44/22 Single-engined long-range reconnaissance seaplane - intended for round-the-World flight Fairey Fremantle
46/22 Three-seat fleet-spotter amphibian[32] Vickers Vanellus
9/23 Superseded by 14/24[1] Blackburn Iris
13/23 Supermarine Seagull II[1]
16/23 None Spotting ship-plane Avro Bison
19/23 Fighter/interceptor - improved Siskin III Armstrong Whitworth Siskin IIIA
21/23 Fleet two-seat torpedo bomber Avro Buffalo, Blackburn Ripon, Handley Page H.P.31 Harrow
23/23 Coastal patrol and anti-submarine flying-boat English Electric Kingston[1]
25/23 Fleet two-seat torpedo bomber/bomber Handley Page H.P.25 Hendon
26/23 Two-seat long-range day-bomber Bristol Berkeley, Handley Page H.P.28 Handcross, Hawker Horsley, Westland Yeovil
28/23 Long-range bomber - Virginia production order Vickers Virginia
37/23 Single-engined fighter/interceptor - improved Grebe Gloster Gamecock
1/24 Three-seat fleet reconnaissance seaplane and amphibian Parnall Pike, Short S.6 Sturgeon, Bristol Type 87
2/24 Light Aeroplane Cancelled
3/24 Single-seat high-performance landplane Hawker Woodcock II (production)
4/24 "Twin-Engined Home Defence Fighter" armed with two 37 mm cannons Westland Westbury Bristol Bagshot
5/24 Advanced landplane, convertible to a seaplane, trainer for RAF and deck-landing trainer for FAA Cancelled replaced by 5A/24
5A/24 Floatplane trainer Vickers Vendace, Blackburn Sprat, Parnall Perch
6/24 Single-seat fighter Fairey Flycatcher I (production)
7/24 'High Powered Single-Seater Fighter Landplane' Avro Avenger, Fairey Firefly, Fairey Fox, Gloster Gorcock, Hawker Hornbill
8/24 Army co-operation aircraft de Havilland Dingo
9/24 Twin engine medium day-bomber - Sidestrand II production order - see also 25/27 Boulton Paul Sidestrand II
10/24 Fleet spotting ship-plane Blackburn Blackburn
11/24 Fleet spotting ship-plane Avro Bison II
12/24 Long-range bomber - Virginia production order Vickers Virginia
13/24 Patrol flying boat Blackburn Iris III, Short Singapore
14/24 Three-engined boat seaplane Blackburn Iris, Saunders Valkyrie
15/24 4-seat heavy night-bomber - initial production batch of Hyderabads Handley Page Hyderabad I
16/24 Submarine-borne reconnaissance seaplane Parnall Peto
17/24 Single-seat high-speed fighter landplane Gloster Guan
18/24 Twin-engined amphibian flying boat - military version of boat ordered to 21/22 Supermarine Southampton
19/24 Three-seat Spotter/Reconnaissance (FAA) /two-seat GP (RAF) aircraft with interchangeable land & float U/C & folding wings Fairey IIIF
20/24 All-metal monoplane flying boat Beardmore Inverness
21/24 Single-seat boat seaplane for storage in restricted space Parnall Prawn
22/24 Three-engine boat seaplane Saunders Valkyrie
23/24 Twin engine civil airliner Handley Page H.P.32 Hamlet
24/24 Conversion of Bison I to Bison Ia Avro Bison
25/24 Single-seater, high-speed fighter landplane Hawker Heron
26/24 Three-engined landplane for dutied in the Middle East Cancelled
27/24 Twin engine single-seat interceptor/night fighter Boulton Paul Bittern
28/24 Day and night fighter - Siskin replacement Armstrong Whitworth Starling
29/24 Twin-engined boat amphibian with Lynx engines (service aircraft) Supermarine Seamew
30/24 Two-seat reconnaissance/army co-operation aircraft de Havilland Hyena, Short Chamois, Vickers Vespa
31/24 Twin-engined boat amphibian with Lynx engines (civil aircraft) Saunders Medina
32/24 Training landplane with Lynx engines - replaced by 3/27 Avro 504N
33/24 Three-engined boat seaplane for civil use Not issued
34/24 Freight carrying landplane Vickers Vellore, Gloucester Goodwood
35/24 Three-engine landplane for Middle East transport Armstrong Whitworth Argosy
11/25 Supermarine Southampton
17/25 Naval single-seater fighter of all-metal stressed-skin construction with interchangeable wheel and float U/C powered by Lynx engine Avro 584 Avocet, Vickers Vireo
20/25 Army co-operation aeroplane - Bristol Fighter/DH.9A replacement Armstrong Whitworth Atlas, Bristol Boarhound
23/25 Two-seat day-bomber, reconnaissance & coastal torpedo-bomber Blackburn Beagle, Gloster Goring, Handley Page H.P.34 Hare, Hawker Harrier, Westland Witch
24/25 High altitude bomber - Horsely replacement Blackburn Beagle, Handley Page H.P.34 Hare, Vickers Vildebeest
7/26 Twin-float high-speed monoplane seaplane for 1927 Schneider Trophy competition Short Crusader
F.9/26 None Day and night 'zone' fighter - no design accepted and Spec. superseded by F.20/27 (q.v.) Armstrong Whitworth Starling II, Blackburn Blackcock/Turcock, Boulton Paul Partridge, Bristol Bulldog Mk.I, Bristol Bullpup, Gloster Goldfinch, Gloster SS.18, Hawker Hawfinch, Vickers Type 141
10/26 Long-range bomber - Virginia production order Vickers Virginia
12/26 Fast two-seat day bomber of all-metal construction using Rolls-Royce F.XIB engine Avro Antelope, Hawker Hart, Fairey Fox IIM
14/26 Passenger flying boat Short Calcutta
21/26 Naval Fleet fighter - see also N.21/26 Parnall Pipit, Vickers Type 141, Vickers Type 177
N.21/26 Naval Fleet fighter - see also 21/26 Armstrong Whitworth Starling II, Armstrong Whitworth AW XVI, Blackburn Blackcock/Turcock, Fairey Firefly III, Gloster Gnatsnapper, Hawker Hoopoe, Vickers Type 177
O.22/26 Naval high-speed, two-seat, Fleet fighter/reconnaissance Blackburn Nautilus, Fairey Fleetwing, Handley Page H.P.37F, Hawker Osprey, Short Gurnard
R.4/27 Maritime patrol flying boat Saunders Severn
R.5/27 Reconnaissance flying boat Blackburn Sydney
8/27 Long-range bomber - Virginia production order Vickers Virginia
F.10/27 Single-seat fighter armed with six machine guns Saunders A.10
B.19/27 Twin engine night-bomber - Virginia/Hinaidi replacement - Hendon winner but introduction delayed so runner-up (Heyford) accepted Avro Ava, Fairey Hendon, Handley Page Heyford, Vickers Type 150, Vickers Type 163, Vickers Type 195, Vickers Type 225, Bristol Type 108
C.20/27 Transport version of Hyderabad/Hinaidi - Chitral/Clive Handley Page Clive
F.20/27 'Interception single-seat fighter' Armstrong Whitworth Starling II, Bristol Bulldog Mk.II, de Havilland DH.77, Fairey Firefly II, Hawker Fury, Saunders A.10, Vickers Jockey, Westland Interceptor
B.22/27 Three engine night-bomber - abandoned due to delays and replaced by B.19/27 (q.v.) Boulton Paul P.32, de Havilland DH.72 Canberra
25/27 Twin engine medium day-bomber - Sidestrand II production order - see also 9/24 Boulton Paul Sidestrand II
26/27 General purpose aircraft - D.H.9A replacement Bristol Beaver, de Havilland Hound, Fairey Ferret, Gloster Goral, Vickers Valiant, Vickers Venture, Vickers Vixen, Westland Wapiti
F.29/27[33] Fighter utilizing a 37 mm cannon from Coventry Ordnance Works Vickers Type 161, Westland C.O.W. Gun Fighter, Bristol Type 112
33/27 'Postal Aircraft' - experimental very-long range aeroplane for world distance-record attempt Fairey Long-range Monoplane
M.5/28 Torpedo bomber - Spec superseded by M.1/30 (q.v.) Handley Page H.P.41
R.6/28 Patrol/reconnaissance flying boat Short Sarafand
8/28 Racing seaplane for 1929 Schneider Trophy using Rolls-Royce R engine, for use by RAF High Speed Flight Supermarine S.6
13/28 Long-range bomber - Virginia production order Vickers Virginia
C.16/28 Bomber-transport capable of carrying 30 fully armed troops, or their equivalent in cargo or bombs, for a distance of 1,200 Mile (1,931 km) nonstop Gloster TC.33, Handley Page H.P.43, Vickers Type 163, Bristol Type 115, Bristol Type 116
F.17/28 Bulldog II production order Bristol Bulldog Mk.II
21/28 High-speed mailplane for Imperial Airways Boulton Paul P.64 Mailplane, Boulton Paul P.71A
1/29 General purpose aircraft (for production) Westland Wapiti
2/29 Two-seat carrier-borne torpedo-bomber (for production) Blackburn Ripon IIA
3/29 Troop transport aircraft Handley Page Clive II
4/29 Ab initio trainer - Moth with Gypsy I order de Havilland Moth
5/29 Elementary trainer (for production) Hawker Tomtit
6/29 General purpose landplane Blackburn CA.15, Boulton & Paul P.42, Westland Limousine V
7/29 Troop carrying aeroplane (for production) Vickers Victoria V
8/29 Single-seat fighter (for production) Armstron Whitworth Siskin IIIA
9/29 Day bomber (for production) Hawker Hart
10/29 Medium day-bomber (for production) Boulton Paul Sidestrand III
11/29 Day and night fighter (for production) Bristol Bulldog IIA
12/29 Spotter reconnaissance aeroplane for the Fleet Air Arm (for production) Fairey IIIF
13/29 Heavy night-bomber (for production) Handley Page Hinaidi II
14/29 Army co-operation aircraft Cancelled
15/29 General purpose aircraft Cancelled
16/29 Experimental tailless aircraft Westland-Hill Pterodactyl IV
17/29 All-metal torpedo-bomber (for development and production) Hawker Horsley
18/29 General reconnaissance flying boat - military version of Calcutta Short Rangoon


Spec. OR Type Designs (accepted and tendered)
M.1/30 Torpedo bomber - Spec. supersedes M5/28 (q.v.) Blackburn M.1/30, Handley Page H.P.46, Vickers Type 207
2/30 Dual control conversion set issued to Blackburn but then cancelled
3/30 Basic trainer - Avro 504N replacement Avro Type 621 Trainer
5/30 Mail carrier Vickers Type 166 Vellore II
6/30 ab initio trainer - Lynx-Avro (Avro 504N) production order Avro 504N
F.7/30 Fighter capable of at least 250 mph and armed with four machine guns Blackburn F.3, Bristol Type 123, Bristol Type 133, Gloster Gladiator, Gloster SS.19, Hawker P.V.3, Supermarine Type 224, Westland F.7/30
8/30 ab initio trainer - Moth with Gypsy II order de Havilland Moth
S.9/30 Two-seat carrier-borne torpedo bomber/three-seat spotter-reconnaissance aircraft Fairey T.S.R.I, Gloster FS.36 ;see also S.15/33
16/30 Naval fighter - written for Nimrod Hawker Nimrod
18/30 Fairey IIIF replacement Fairey Gordon I
19/30 Naval fighter/reconnaissance with folding wings and interchangeable wheel/float U/C Hawker Osprey
G.4/31 General-purpose/torpedo bomber - Wapiti & Gordon replacement - Wellesley one of two designs submitted by Vickers and itself a PV - see also G.22/35 Blackburn B-7, Bristol Type 120, Fairey G.4/31, Handley Page H.P.47, Hawker P.V.4, Parnall G.4/31, Vickers G.4/31, Vickers Wellesley, Westland PV-7
5/31 Long-range bomber - Virginia production order Vickers Virginia
13/31 ab initio trainer with complete freedom for parachute escape by both occupants - D.H.60T accepted with modifications, becoming D.H.82 - see also T.23/31 (Note: some sources give 13/31 as an order for the Ripon IIC) Avro Type 631 Cadet, de Havilland D.H. 60T Tiger Moth
18/31 Basic trainer - Avro Type 621 Trainer with Lynx engine Avro Tutor
R.19/31 Three-engined long-range reconnaissance flying boat - Rangoon three-aircraft production order Short Rangoon
R.20/31 Twin-engined flying boat - all-metal Kestrel-engined Southampton II (Southampton IV/Scapa) Supermarine Scapa
T.23/31 Tiger Moth I production order de Havilland Tiger Moth I
R.24/31 General Purpose Open Sea Patrol Flying Boat Saunders Roe London, Short R.24/31 Knuckleduster, Supermarine Stranraer
C.26/31 OR.4 Bomber-transport - Valentia replacement Armstrong Whitworth A.W.23, Bristol Bombay, Handley Page H.P.51. Vickers Type 230 - (not built)
B.9/32 OR.5 Twin-engine medium day bomber with appreciably higher performance than predecessors - later revised to specify Goshawk power and subsequently re-revised with Goshawk requirement dropped Vickers Crecy, Handley Page Hampden, Bristol Type 131
S.11/32 Naval catapult observation/spotting seaplane for carriage on cruisers Fairey Seafox
T.12/32 Trainer Bristol Type 124
19/32 Conversion of Westland Wapiti into Westland Wallace standard Westland Wallace
20/32 Three-engined long-range reconnaissance flying boat - improved Iris with Buzzard engines Blackburn Perth
25/32 Basic trainer - revised-Tutor production order Avro Tutor I
B.23/32 Twin-engine medium bomber - written for Heyford I & IA production order Handley Page Heyford Mk. I/IA
P.27/32 Light day bomber - Hart/Hind replacement - see P.23/35 Armstrong Whitworth A.W.29, Fairey Battle, Gloster P.27/32, Bristol Type 136
R.1/33 Patrol/reconnaissance flying boat Westland-Hill Pterodactyl Mk.VII
R.2/33 Long-range patrol/reconnaissance flying boat Short Sunderland, Saro A.33
R.3/33 Long-range patrol/reconnaissance flying boat - trials order for Singapore III Short Singapore III
F.5/33 Twin-engine two-seat turret fighter - later cancelled Armstrong Whitworth A.W.34, Boulton Paul P.76, Bristol Type 140, Gloster F.5/33, Parnall F.5/33, Westland-Hill Pterodactyl Mk.V
T.6/33 Tiger Moth floatplane two aircraft evaluation order de Havilland Tiger Moth
13/33 4-engined mail seaplane and 4-engine flying boat carrier - Short-Mayo Composite Short S.20 Mercury, Short S.21 Maia
14/33 Fairey Gordon II production order Fairey Gordon II
S.15/33 Naval carrier-borne torpedo bomber/spotter/reconnaissance (TSR) - Fairey 9/30 (q.v.) design modified and re-submitted as T.S.R.II - Spec. replaces S.9/30 & M.1/30 (q.v.) Blackburn Shark, Fairey Swordfish, Gloster TSR.38
18/33 Radio-controlled Fleet gunnery target aircraft de Havilland Queen Bee
21/33 Three-seat general purpose/Army co-operation aircraft - Fairey IIIF/Wapiti replacement - improved Vildebeest Vickers Vincent
F.22/33 Fighter Bristol Type 141
G.23/33 General purpose aeroplane - Hart for Middle East Hawker Hardy
24/33 Gloster Gauntlet production order Gloster Gauntlet
25/33 Twin-engined troop and cargo transport - improved Victoria Vickers Valentia
T.26/33 Tiger Moth II production order de Havilland Tiger Moth II
B.29/33 Twin engine medium day bomber with power-operated nose turret Boulton Paul Sidestrand V (Overstrand)
1/34 Two-seat Army Co-operation Fighter Bomber for the Royal Australian Air Force[34] Hawker Demon
2/34 High-altitude research aircraft capable of reaching 50,000 ft Bristol Type 138A
B.3/34 OR.12 Heavy bomber landplane,[34] Twin-engine night bomber & bomber/transport - Virginia, Heyford & Hendon replacement - transport requirement later removed after protests from manufacturers Armstrong Whitworth Whitley, Bristol Type 144
P.4/34 OR.13 Light day bomber for tactical support[34] Fairey P.4/34, Hawker Henley
F.5/34 OR.15 Single-seat fighter[34] (although contracts were placed for prototypes with three companies none were ordered into production)[34] Bristol Type 146, Martin-Baker M.B.2, Vickers Type 279 Venom
6/34 Single-engine biplane amphibian for Australia.[34] Supermarine Seagull V
G.7/34 Two-seat general purpose light bomber,[34] Interim Hart day bomber replacement Hawker Hind
8/34 Two-seat interceptor fighter[34] (production of Demon I for the RAF[34]) Hawker Demon
9/34 Two-seat day bomber and army co-operation aircraft[34] (production of Hawker Audax[34]) Hawker Audax
10/34 Hawker Hart communications aircraft (two aircraft delivered to No. 24 Squadron RAF[34]) Hawker Hart
11/34 Torpedo spotter reconnaissance aircraft development[34] (One Fairey Seal fitted with an Armstrong Siddeley Panther VI engine[34]) Fairey Seal
12/34 Torpedo spotter reconnaissance aircraft development[34] (production of 16 Sharks for use by No. 820 Squadron RAF[34]) Blackburn Shark
13/34 Bulldog trainer production[34] (production of Bulldog TM Type 124[34]) Bristol Bulldog
R.14/34 Singapore III production order[34] Short Singapore III
15/34 Three-seat torpedo bomber[34] (production of Mk III[34]) Vickers Vildebeest
16/34 Three-seat general purpose aircraft - Vincent I production order including conversion of outstanding Vildebeests to Vincents Vickers Vincent I
17/34 Torpedo bomber[34] (additional Baffin T.8A aircraft for conversion training, three built[34]) Blackburn Baffin
18/34 Single-engine day bomber[34] (Hawker Hart IB production[34]) Hawker Hart
19/34 Two-seat Army co-operation aircraft[34] (production of Audax Is for use in India, 50 aircraft built[34] Hawker Audax
B.20/34 Twin-engine night bomber - Hendon production order to this spec - see also B.19/27 Fairey Hendon
21/34 Two-seat fleet spotter reconnaissance aircraft[34] (Osprey III production[34]) Hawker Osprey
22/34 Close-support aircraft - Audax for SAAF Hawker Hartebees
B.23/34 Twin engine medium day bomber - Overstrand production order Boulton Paul Overstrand
24/34 Basic trainer - production order for second batch of definitive Tutor design - see 3/30, 18/31 & 25/32 Avro Tutor I
25/34 Amphibian trainer[34] (production of three Clouds[34]) Saro Cloud
26/34 Float seaplane trainer[34] (production of 16 Tutors for the Seaplane Training School[34]) Avro Type 646 Sea Tutor
O.27/34 Naval dive bomber Blackburn Skua
B.28/34 Twin-engine medium bomber - written for Heyford II production order Handley Page Heyford Mk. II
29/34 Hawker Fury for the South African Air Force[34] Hawker Fury
30/34 Twin-engined troop and cargo transport - Valentia I production order Vickers Valentia I
31/34 Armoured day bomber (development of armoured crew protection for the Hart[34]) Hawker Hart
32/34 Navigation trainer - Prefect production order Avro 626/Prefect
F.36/34 OR.16 High Speed Monoplane Single Seater Fighter (based on the Hawker submission to F.5/34)[34] Hawker Hurricane
F.37/34 High Speed Monoplane Single Seater Fighter (based on the private venture Supermarine Type 300 submission)[34] Supermarine Spitfire
S.38/34 Written for Swordfish production order Fairey Swordfish I
A.39/34 Two-seat Army co-operation aeroplane Bristol Type 148, Westland Lysander
B.1/35 OR.19 Twin-engine medium bomber Airspeed A.S.29, Armstrong Whitworth A.W.39, Handley Page H.P.55, Vickers Warwick
2/35 Naval catapult-launched observation/spotting flying boat for carriage on cruisers Supermarine Walrus
F.9/35 Two-seat four-gun turret fighter - Demon replacement Hawker Hotspur, Boulton Paul Defiant, Bristol Type 147
F.10/35 Drawn up for the Spitfire prototype Supermarine Spitfire
13/35 Naval torpedo-spotter-reconnaissance aircraft - written for Shark production order Blackburn Shark
14/35 Army Co-operation aircraft - Audax replacement Hawker Hector
F.14/35 Written for Gladiator I initial production order Gloster Gladiator I
M.15/35 Land-based general reconnaissance/torpedo-bomber Blackburn Botha, Bristol Beaufort
16/35 Autogyro - written for Cierva C.30/Avro 671 Rota evaluation order Avro Rota
18/35 Twin-engined coastal reconnaissance landplane - written for Anson Avro Anson
20/35 Radio-controlled Fleet gunnery target aircraft - Queen Bee production order de Havilland Queen Bee
B.21/35 Twin-engine medium bomber - written for Whitley II production order Armstrong Whitworth Whitley II
G.22/35 General-purpose day and night bomber and coastal-defence torpedo-carrier - Wellesley production order - see also G.4/31 Vickers Wellesley
P.23/35 Written for Battle I production order Fairey Battle I
G.24/35 General Reconnaissance - Anson replacement Bristol Type 149, Bristol Beaufort
26/35 Naval fighter/reconnaissance - Osprey IV production order Hawker Osprey IV
B.27/35 Twin-engine medium bomber - written for Heyford III production order Handley Page Heyford Mk. III
B.28/35 Drawn up for Bristol 142M Bristol Blenheim
B.29/35 Written for Harrow initial production order Handley Page Harrow
O.30/35 Naval turret-fighter - fighter development of Skua accepted Blackburn Roc, Boulton Paul P.85
Q.32/35 Radio-controlled Fleet Gunnery target aircraft - Queen Bee replacement Airspeed Queen Wasp
F.34/35 Twin-engined turret-armed fighter Gloster F.34/35
F.35/35 Very high speed fighter Airspeed A.S.31 (not built)
36/35 Trans-Atlantic mail plane de Havilland Albatross
F.37/35 OR.31 Fighter with cannon Westland Whirlwind, Hawker Hurricane with Oerlikon cannon, Supermarine Type 313, Bristol Type 153
39/35 Twin-engine communications aircraft - Envoy with dorsal turret order for SAAF Airspeed Envoy
R.1/36 OR.32 Small reconnaissance flying boat Saro Lerwick, Blackburn B-20
2/36 Development of the Cierva C.30 (cancelled)
3/36 Development of the Avro 652A (cancelled)
4/36 Catapult bomber (cancelled) Short S.27
5/36 OR.33 Improved Walrus for the Fleet Air Arm Supermarine Walrus
T.6/36 OR.34 Advanced monoplane trainer mounting manually operated dorsal turret - Don accepted but proved unsuitable de Havilland Don, Miles Kestrel
M.7/36 Torpedo Spotter Reconnaissance aircraft (cancelled) Fairey Albacore
O.8/36 OR.36 Reconnaissance dive bomber for the Fleet Air Arm (cancelled)
S.9/36 Three-seat spotter fighter for the Fleet Air Arm (cancelled) Fairey S.9/36
10/36 OR.38 Written for Beaufort production order Bristol Beaufort I
11/36 OR.39 Interim General Reconnaissance - aircraft later renamed 'Blenheim IV' and 'Bolingbroke' name transferred to Canadian-built Blenheim Bristol Bolingbroke I
B.12/36 OR.40 Four-engine heavy bomber Armstrong Whitworth B.12/36, Short Stirling, Supermarine Type 316
P.13/36 OR.41 Twin-engined medium bomber for "world-wide use" introduction delayed due to production difficulties necessitating further order of Whitleys & Wellingtons[35] Avro Manchester (2 prototypes ordered), Handley Page H.P.56 (one prototype ordered), Hawker P.13/36 (project only), Vickers Warwick with Rolls-Royce Vulture engines.[citation needed]
14/36 Production specification for the Fairey Battle I Fairey Battle (500 ordered later reduced to 311)
F.15/36 Written for Hurricane redesigned for Merlin II Hawker Hurricane I
17/36 Written for Hotspur initial production order - later cancelled Hawker Hotspur; cancelled
19/36 Naval torpedo-spotter-reconnaissance aircraft - written for Shark additional production order Blackburn Shark
B.20/36 Twin-engine medium bomber - written for Whitley III production order Armstrong Whitworth Whitley III
T.23/36 Multi-role crew trainer Airspeed Oxford
25/36 Written for Skua initial production order Blackburn Skua
26/36 Written for Roc initial production order Blackburn Roc
29/36 Written for Wellington (revised Crecy from B.9/32) initial production order Vickers Wellington I
B.30/36 Written for Hampden initial production order Handley Page Hampden I
33/36 Written for Blenheim I production order (Rootes) Bristol Blenheim I
36/36 Written for Lysander initial production order Westland Lysander I
37/36 Written for Walrus additional production order Supermarine Walrus I
39/36 Written for Botha additional production order (Boulton Paul) - cancelled Blackburn Botha
T.40/36 OR.44 Development and production of a trainer version of the Miles Hawk Miles Magister
S.41/36 Three-seat torpedo/spotter-reconnaissance aircraft - Swordfish replacement Fairey Albacore
42/36 Target tug - order for Henley target tug conversions by Gloster's Hawker Henley III
43/36 Autogyro Cierva C.40 Rota II
B.44/36 Written for Dagger-Hampden (Hereford) production order Handley Page Hereford I
45/36 Written for Botha additional production order (Blackburn) - cancelled Blackburn Botha
47/36 Written for Bombay II production order Bristol Bombay II
T.1/37 Basic trainer Heston T.1/37 Trainer, Miles M.15, Parnall Heck III, Airspeed A.S.36 (not built)
2/37 Written for Blenheim I production order (Avro) Bristol Blenheim I
6/37 Twin-engine VIP transport aircraft - order for The King's Flight Airspeed Envoy
Q.8/37 Radio-controlled Fleet Gunnery target aircraft - Queen Bee replacement - role subsequently carried-on by Queen Wasp - see Q.32/35 Airspeed A.S.37 (not built)
F.9/37 OR.49 Twin-engine day/night fighter Gloster G.39
F.11/37 Twin-engine two-seat day & night fighter/ground support Boulton Paul P.92
F.18/37 Heavily armed interceptor armed with 12 x 0.303 mgs and capable of at least 400 mph Bristol F.18/37, Gloster F.18/37, Hawker Tornado, Hawker Typhoon, Supermarine Type 324, Supermarine Type 325
19/37 Written for Manchester I production order Avro Manchester I
20/37 Written for Roc floatplane production order Blackburn Roc
S.23/37 OR.52 Four-engine carrier-based Fleet shadower/follower - low-speed, high-endurance, ship-tracking aircraft - requirement later rendered obsolete due to introduction of radar Airspeed AS.39, General Aircraft GAL.38
S.24/37 OR.53 Naval torpedo/dive-bomber, reconnaissance - Supermarine entry featured variable-incidence wing Supermarine S.24/37, Fairey Barracuda
32/37 Written for Halifax initial production order Handley Page Halifax I Srs 1 - I Srs 3
B.32/37 OR.44 Production contract for a four-engine version of the P.13/36 H.P.56 design Handley Page H.P.57 Halifax
37/37 Magister I production order Miles Magister I
38/37 Three-seat communications aircraft & instrument/wireless trainer Miles Mentor
T.39/37 Three-seat communications aircraft & instrument/wireless trainer Airspeed AS.42 Oxford for the Royal New Zealand Air Force
42/37 Specification for wooden mockup of Miles X2 large transport aeroplane - not built - lead to Miles M.30X Minor scale testbed Miles M.30X Minor
43/37 Engine testbed Folland Fo.108; designs also tendered by General Aircraft & Percival
S.7/38 Naval catapult-launched observation/spotting flying boat - Walrus replacement Supermarine Sea Otter
O.8/38 Naval carrier-borne fighter/observation - winner developed from Fairey's earlier P.4/34 entry Fairey Fulmar
B.9/38 Twin-engine medium bomber of simple construction using materials other than light alloy wherever possible see B.17/38 and B.18/38[36]
14/38 Long-range pressurised high-altitude monoplane transport/airliner (Shorts) - 3 prototypes ordered, construction started - cancelled Short S.32
15/38 Short/Medium-range monoplane transport/airliner (Fairey) - Fairey FC.1, 14-aircraft production order - cancelled Fairey FC1, General Aircraft GAL.40
16/38 Trainer - Master I production order Miles Master T.Mk.I
B.17/38 Twin-engine medium bomber of mixed wood/metal construction Bristol Type 155 (cancelled by Bristol)[36]
B.18/38 Twin-engine medium bomber of mixed wood/metal construction Armstrong Whitworth Albemarle[36]
B.19/38 Bomber with 8,000 lb load and eight 20mm cannon in two turrets - revised to become B.1/39 Bristol Type 157
20/38 Communications aircraft - Vega Gull order Percival Vega Gull
21/38 Communications aircraft - Dominie production order de Havilland Dominie
S.22/38 Naval helicopter Cierva C.41 Gyrodyne
24/38 Twin-engine communications aircraft - Envoy production order Airspeed Envoy
25/38 Twin-engine communications aircraft Percival Petrel
26/38 OR.65 Three-seat wireless or navigation training aircraft with dual controls - Vega Gull adapted for communications training Percival Proctor I
28/38 OR.66 Two-seat helicopter - written for Weir W.6 Weir W.6
T.29/38 Twin-engine R/T (Radio Telephony) training aircraft - Dominie three aircraft order de Havilland Dominie
B.1/39 "Ideal Bomber" Four-engined heavy bomber with 9,000 lb bomb load and 20mm cannon defence (revised B.19/38) - work suspended June 1940[37] Handley Page H.P.60, Bristol Type 159
T.4/39 OR.68 Single-engined trainer Airspeed Cambridge - (two prototypes ordered, no production contract)
R.5/39 Long-range patrol flying boat - Sunderland replacement - superseded by R.14/40 (q.v.) Saunders-Roe S.38 - later cancelled
N.8/39 Naval two-seat carrier-borne fighter - Roc replacement - replaced by N.5/40 see N.5/40
N.9/39 Naval two-seat carrier-borne fighter - Fulmar replacement - replaced by N.5/40 see N.5/40
F.17/39 Long-range fighter development of Bristol Beaufort - written for Beaufighter Bristol Beaufighter
F.18/39 Fighter - Hurricane/Spitfire replacement Martin-Baker M.B.3, Martin-Baker M.B.5
19/39 Twin-engine transport aircraft - order for Hertfordshire later cancelled de Havilland Hertfordshire
20/39 Twin-engine communications aircraft - order for No. XXIV Squadron RAF de Havilland Flamingo
21/39 Twin-engine VIP transport aircraft - order for The King's Flight de Havilland Flamingo
F.22/39 OR.76 Fighter fitted with heavy-calibre nose-mounted gun Vickers 414 Vickers Type 432 - also tests with Vickers Type 439 testbed - specification later cancelled
B.23/39 Very high altitude version of Wellington capable of operating at 40,000 ft Vickers Wellington V
E.28/39 Experimental aircraft using Whittle jet-propulsion with provision for 4 x 0.303 machine guns Gloster E.28/39


Spec. OR Type Designs (accepted and tendered)
B.1/40 OR.78 Twin-engine fast bomber carrying no defensive armament de Havilland Mosquito
F.1/40 Air Observation Post (AOP) Fane F.1/40, General Aircraft GAL.47[38]
2/40 OR.79 Twin-engined trainer aircraft Caproni Ca 311, Caproni Ca 313
F.2/40 Fighter using Whittle jet-propulsion (Metrovick) - written for Meteor - see also F.9/40 Gloster Meteor II
B.3/40 OR.80 High speed bomber Blackburn B.28[39]
F.4/40 OR.81 High-altitude fighter - superseded by F.7/41 (q.v.) Westland Welkin
N.5/40 OR.82 Naval 2-seat Fleet fighter Fairey Firefly
B.6/40 OR.83 Twin-engine day/close support bomber - later renamed Blenheim V Bristol Bisley
B.7/40 OR.84 Medium Bomber replacement for Blenheim bomber development of Beaufighter[40] A design by Armstrong Whitworth not taken further Bristol Beaumont accepted but not built, led to Buckingham (q.v.)[41]
8/40 OR.85 Ambulance Aircraft Airspeed Oxford
F.9/40 OR.86 Fighter using Whittle jet-propulsion (Rover/Rolls-Royce) - written for Meteor - see also F.2/40 Gloster Meteor I
X.10/40 OR.87 Troop-carrying glider capable of carrying 7 troops General Aircraft Hotspur I; cancelled after eighteen built - redesigned Hotspur II relegated to training - see X.22/40 & X.23/40
N.11/40 OR.88 Naval single-seat Fleet fighter powered by Napier Sabre - see also S.8/43 Blackburn Firebrand F.I, Hawker P.1009 "Fleet Fighter"
S.12/40 OR.89 Naval catapult-launched observation/spotting flying boat - Walrus & Sea Otter replacement - superseded by S.14/44 (q.v.) Supermarine Type 381
R.13/40 OR.90 General-purpose flying boat Blackburn B-40
R.14/40 OR.91 Very long range reconnaissance flying boat - Centaurus-engined Sunderland replacement Saunders-Roe S.41, Short Shetland
15/40 OR.92 Conversion of Supermarine Spitfire for Photographic Development Unit Supermarine Spitfire
F.16/40 High-altitude fighter Vickers Type 432
17/40 OR.94 Very high altitude bomber - Wellington V production order Vickers Wellington V
F.18/40 OR.95 Night fighter with turret Gloster F.18/40 fulfilled by de Havilland Mosquito NF.II[42]
F.19/40 Low-cost emergency production fighter Miles M.20/2
B.20/40 "Close Army Support Bomber" with Merlin engine able to dive bomb and photoreconnaissance De-navalised version of Fairey Barracuda offered but specification not proceeded with.[39]
F.21/40 OR.96 Fighter version of Mosquito de Havilland Mosquito F.II
X.22/40 Troop-carrying training glider - Hotspur II production order General Aircraft Hotspur II
X.23/40 Troop-carrying training glider - Hotspur II further production order General Aircraft Hotspur II
T.24/40 Training aircraft Airspeed A.S.50 (not built)
X.25/40 OR.98 Troop-carrying glider capable of carrying 14 troops Slingsby Hengist
X.26/40 OR.99 Troop-carrying glider of wooden construction capable of carrying between 24-36 fully armed troops Airspeed Horsa
X.27/40 OR.100 Tank-carrying heavy glider capable of carrying 7-ton load General Aircraft Hamilcar
E.28/40 OR.101 Experimental research aircraft for deck landings - cancelled 1943 Folland Fo.115 Folland Fo.116 (ordered but not completed)[43]
F.29/40 Twin-engined night fighter to cover the Gloster "Reaper" development of F.9/37 (cancelled May 1941)[42]
N.1/41 OR.102 Naval fighter Miles M.20/4
B.2/41 Twin-engine bomber - Blenheim replacement - written for redesigned Bristol Type 162 Beaumont. Changes in requirements and availability of superior aircraft led to type no longer being needed Bristol Buckingham (adapted for courier duties as C.1)
X.3/41 OR.104 Emergency Tallboy-carrying conversion of Horsa for attack on Tirpitz - later cancelled when Lancaster was modified to carry Tallboy Airspeed A.S.52 Horsa
F.4/41 Spitfire with Griffon engine - written for Spitfire IV but amended to include Mk. XXI redesign. Preceded in introduction by Mk.s XII & XIV - some overlap with F.1/43 (q.v.) Supermarine Spitfire XXI
B.5/41 OR.106 Pressurised high-altitude bomber - evolved into B.3/42 (q.v.) Pressurised version of the Vickers Warwick III
E.6/41 OR.107 Experimental jet fighter - DH Spider Crab de Havilland Vampire
F.7/41 OR.108 High-altitude fighter - revised from F.4/40 (q.v.) Vickers Type 432, Westland Welkin
B.8/41 Four-engined heavy bomber - see also B.3/42 Short S.36, Vickers Windsor
T.9/41 Four-seat radio trainer. Percival Proctor IV
F.10/41 OR.109 Written for Hawker Tempest Hawker Tempest
B.11/41 OR.110 High-speed high-altitude unarmed bomber de Havilland DH.99, Hawker P.1005, Miles M.39
12/41 Target tug Miles Martinet
C.1/42 OR.113 Interim transport aircraft - cargo version of Lancaster - York I production order Avro York I
N.2/42 OR.114 Single-seat boat fighter Blackburn B-44
B.3/42 OR.115 High-performance long-range bomber Vickers Windsor
B.4/42 High performance bomber (Mosquito replacement) - Cancelled
5/42 Glider for RAAF De Havilland Australia DHA-G2
E.5/42 Experimental single-engined jet fighter - later cancelled - see E.1/44 Gloster GA.1
E.6/42 Experimental lightweight Tempest - written for Tempest Light Fighter - refined & re-issued as F.2/43 (q.v.) Hawker Fury - see F.2/43
F.6/42 Single-seat fighter Boulton Paul P.99, Boulton Paul P.100, Hawker Type P.1018, Hawker Type P.1019, Hawker Type P.1020, Folland Fo.117a, Miles M.42, Miles M.43, Miles M.44
H.7/42 OR.117 Torpedo bomber - Beaufighter replacement Bristol Brigand
R.8/42 OR.118 Long-range patrol/reconnaissance flying boat - Sunderland with Hercules engines Short Sunderland IV/Seaford
Q.9/42 OR.119 Twin engine target tug - planned production of Monitor later cancelled - see also Q.1/46 'Miles Monitor TT Mk.1
10/42 "Special Rotating Wing Glider" used to identify the Hafner Rotabuggy
B.27/42 Halifax development aircraft Handley Page Halifax
F.1/43 OR.120 Development of Spitfire with Griffon & laminar flow wing - see also N.5/45 Supermarine Spiteful
F.2/43 OR.121 Written for Tempest Light Fighter Hawker Fury; cancelled at conclusion of hostilities.
TX.3/43 OR.122 Two-seat side-by-side seating training glider General Aircraft G.A.L.55
N.4/43 OR.113 Carrier-based fighter - Seafire with Griffon engine Supermarine Seafire XV
O.5/43 OR.144 Torpedo bomber - Barracuda replacement Fairey Spearfish
S.6/43 Torpedo Bomber Reconnaissance Aircraft (Cancelled) Armstrong Whitworth A.W.53
N.7/43 Carrier-based fighter - revised as N.22/43 (q.v.) Hawker Sea Fury
S.8/43 OR.124 Naval single-seat Fleet fighter capable of carrying rockets, torpedo or bombs - Firebrand powered by Centaurus - see also N.11/40 Blackburn Firebrand TF.III
F.9/43 OR.125 Two-seat high-altitude night fighter Westland Welkin NF.II
Q.10/43 Radio-controlled Fleet Gunnery target aircraft - Queen Wasp replacement Miles Queen Martinet
S.11/43 OR.146 Naval carrier-borne attack/strike aircraft - later cancelled - Sturgeon also submitted to Q.1/46 & M.6/49 (q.v.) Armstrong Whitworth A.W.54, Short Sturgeon
F.12/43 OR.126 Long-range fighter for Far East - written for Hornet de Havilland Hornet
T.13/43 OR.148 Advanced trainer Bristol Buckmaster
B.14/43 Heavy bomber for Far East Avro Lincoln, Handley Page H.P.65
15/43 OR.151 Medium Range Civil Transport Aircraft Handley Page Hermes
E.16/43 Experimental helicopter with powered tilting hub controlled rotor with automatic collective pitch control, and torque reaction control using jet efflux. Cierva W.9
A.17/43 OR.145 Army liaison and VIP transport aircraft - Messenger I production order Miles Messenger I
C.18/43 Stop-gap airliner version of Stirling Short S.37 Stirling
F.19/43 OR.127 Folland design to be built by English Electric
20/43 OR.142 Two-seat training glider suitable for ATC cadets Slingsby Kirby Cadet TX Mk.1
T.21/43 OR.153 Trainer version of Fairey Spearfish Fairey Spearfish T. Mk 1
N.22/43 OR.155 Revision of N.7/43; carrier-based fighter Hawker Sea Fury
T.23/43 OR.131 Trainer - all-weather fully aerobatic three-seater Percival Prentice
E.24/43 Experimental jet research aircraft capable of 1,000 mph and able to reach 36,000 ft in 1 and 1/2 minutes Miles M.52; cancelled 1946
25/43 Brabazon IIA - Civil Transport for European service Airspeed Ambassador
C.26/43 (26/43) Brabazon VB - Light Civil Air Transport De Havilland Dove
B.27/43 OR.149 Heavy bomber - developed Halifax Handley Page HP.66 and HP.69 - cancelled with end of war.[44]
S.28/43 OR.150 Firebrand replacement Blackburn B-48 YA.1/Firecrest
29/43 Airliner version of Lancaster IV - see also B.14/43 Avro Tudor
E.1/44 OR.157 Experimental Nene-powered jet fighter Gloster GA.2
2/44 Brabazon Committee Type I Long range transatlantic airliner Bristol Brabazon I, Miles X-15 (not built)
C.3/44 Long-range general-purpose transport - York replacement Handley Page Hastings
X.4/44 OR.160 Tank-carrying heavy glider capable of carrying 7-ton load and returning under its own power General Aircraft Hamilcar X
N.5/44 OR.162 Naval carrier-version of Hornet de Havilland Sea Hornet
E.6/44 OR.170 Written for Saro SR.44 flying-boat jet fighter Saro SR.A/1
N.7/44 OR.167 Carrier-based fighter - navalised version of Spitfire F Mk.21 Supermarine Seafire F Mk.45
PR.8/44 Photoreconnaissance version of the Bristol Buckingham Specification cancelled
E.9/44 Flying wing jet bomber/airliner Armstrong Whitworth A.W.52
E.10/44 OR.182 Experimental Nene-powered jet fighter - Jet Spiteful see N.5/45
N.11/44 OR.174 Naval long-range carrier-based fighter with Eagle 22 piston engine capable of accepting a turboprop at a later date - RN version of F.13/44 (q.v.) - see also N.12/45 Westland Wyvern
12/44 Medium range civil transport aircraft Handley Page Hermes II
F.13/44 OR.194 Long-range fighter with Eagle 22 piston engine capable of accepting a turboprop at a later date - RAF version of N.11/44 (q.v.) - see also N.12/45 Westland Wyvern, Hawker P.1027/P.1030
S.14/44 OR.89 Naval land-based ASR Supermarine Seagull ASR-1
N.15/44 OR.189 Naval carrier-version of Mosquito de Havilland Sea Mosquito TR.33
16/44 Stop-gap airliner version of Lancaster Avro Lancastrian C.Mk 1
17/44 Medium-short haul passenger aircraft - stop-gap airliner version of Wellington Vickers Wellington Transport Aircraft
18/44 Brabazon Committee Type Va Civil feederliner Miles Marathon
19/44 Civil transport version of the Avro York C1 Avro York
20/44 Jet civil transport (de Havilland DH.106) Not issued
O.21/44 Twin-Merlin engined Fairey Spearfish Specification cancelled
22/44 Transport aircraft - mixed passenger, freight/passenger or all-freight high-payload/short-distance - see also G.9/45 Bristol Wayfarer/Freighter
E.1/45 OR.195 Experimental aircraft for research into proposed tailless configuration of early DH.106 Comet airliner design de Havilland DH.108
A.2/45 OR.176 Army Air Observation Post (AOP) - replacement for Taylorcraft Auster AOPs Auster A.2/45, Heston A.2/45
B.3/45 OR.199 Two-seat twin-engine high-altitude fast jet bomber carrying no defensive armament - Mosquito replacement - revised from E.3/45 (q.v.) English Electric Canberra B.1 - see also B.5/47
B.3/45 Experimental two-seat twin-engine high-altitude fast jet bomber carrying no defensive armament - Mosquito replacement - reissued as B.3/45 (q.v.) English Electric Canberra
A.4/45 OR.164 Army three-seat light communications aircraft - Leonides-powered Pioneer II later accepted 1950 Scottish Aviation Pioneer I
N.5/45 Naval carrier-borne fighter - Seafang developed to this spec. but supplanted by Nene-powered, Naval version of E.10/44 (q.v.) Supermarine Attacker, Supermarine Seafang
T.7/45 OR.159 Three-seat advanced trainer using turboprop engine - Harvard replacement - replaced by T.14/47 (q.v.) Avro Athena T.1, Boulton Paul Balliol T.1
TX.8/45 OR.180 Tandem-seat training glider for Air Training Corps Slingsby T.24 Falcon 4
C.9/45 OR.192 Military transport aircraft capable of carrying a 3 ton load into jungle areas - see also 22/44 Bristol Wayfarer/Freighter
E.11/45 Experimental aircraft for research into low-speed handling and high Mach number flying of tailless designs - two examples of Swallow (one low- and one high-speed) ordered - see also E.1/45 de Havilland DH.108
N.12/45 OR.213 Long-range carrier-based fighter - Wyvern with Python turboprop engine - see also F.13/44 & N.11/44 Westland Wyvern S.4
C.13/45 High speed military transport aircraft Airspeed Ayrshire
C.15/45 Long range transport aircraft Handley Page H.P.72
GR.17/45 OR.220 Carrier-borne ASW Blackburn B-54/B-88, Fairey Gannet
Q.19/45 OR.204 Mosquito target tug de Havilland Mosquito TT.39
E.20/45 OR.221 Experimental helicopter - see also E.34/46 Bristol Type 171
N.21/45 OR.226 Naval carrier-borne two-seat night fighter de Havilland Sea Hornet NF.21
Q.1/46 OR.225 Naval target tug de Havilland Mosquito TT.39, Miles Monitor, Short Sturgeon TT.1,
2/46 Brabazon Committee Type I Long range transatlantic airliner - Brabazon II (Coupled Proteus) order Bristol Brabazon II
C.3/46 Medium-range tactical transport General Aircraft Ltd. 65 Universal Freighter
N.3/46 Naval helicopter Cierva Air Horse
E.4/46 Experimental gyrodyne Fairey Gyrodyne
R.5/46 OR.200 Four engine long-range Maritime patrol bomber - Liberator GR replacement Avro Shackleton
N.7/46 OR.218 Naval carrier-borne interceptor/fighter bomber Hawker Sea Hawk
C.9/46 All-round air transport - military version of Viking Vickers Valetta C.Mk.1
N.11/46 Two-seat trainer version of Sea Fury Hawker Sea Fury T.20
B.14/46 OR.239 Four engine jet medium bomber - later used as insurance against delay of aircraft submitted to B.35/46 Short Sperrin
C.16/46 Brabazon Committee Type IIB Short-medium range turboprop airliner carrying 24-30 passengers Armstrong Whitworth A.W.55 Apollo, Handley Page H.P.76, Handley Page H.P.77, Handley Page H.P.78, Vickers Viscount
E.19/46 Experimental helicopter for crop spraying Cierva Air Horse
22/46 Brabazon Committee Type IV Jet-propelled trans-atlantic mail plane/jet airliner - MoS order for two Comet prototype/production aircraft de Havilland Comet
26/46 Brabazon Committee Type II Short-range feederliner - Dragon Rapide replacement de Havilland Dove
E.27/46 OR.241 Experimental aircraft for investigation into delta wing characteristics at transonic speeds Boulton Paul P.111
PR.31/46 OR.223 Photo Reconnaissance version of B.3/45 English Electric Canberra PR3
E.34/46 OR.242 Experimental helicopter - see also E.20/45 Bristol Sycamore
B.35/46 OR.229 Four engine swept-wing jet medium bomber with a cruising speed of 500 kt and a ceiling of at least 55,000 ft Armstrong Whitworth A.W.56, Avro Vulcan, Bristol Type 172, de Havilland DH.111, Handley Page Victor, Short PD.1; Designs also submitted by Vickers & English Electric
E.38/46 OR.243 Experimental aircraft for investigation into the controllability and stability of swept wings at low speeds. Hawker P.1052
N.40/46 OR.246 Naval carrier-borne jet fighter - see also F.4/48 de Havilland DH.110
E.41/46 Experimental swept-wing version of Attacker - evolved into Swift Supermarine 510, Supermarine Swift
R.42/46 Marine Reconnaissance Landplane (Avro Shackleton replacement) - cancelled Avro Shackleton
F.43/46 OR.228 Interceptor using Rolls-Royce AJ.65 or Metrovick F.9 axial engines - superseded by F.3/48 (q.v.) Gloster P.234, Gloster P.248, Gloster P.250, Hawker P.1054
F.44/46 OR.227 Two-seat twin-engined night/all weather fighter see F.24/48 & F.4/48
T.1/47 OR.238 Two-seat trainer version of Meteor - written around Gloster's civil Meteor demonstrator G-AKPK Gloster Meteor T.7
C.2/47 Brabazon Committee Type III Airliner - medium-range Empire transport Bristol Britannia, Handley Page H.P.83, Handley Page H.P.84, Handley Page H.P.85, Handley Page H.P.86
F.3/47 Fighter - Vampire with wing strengthened for carriage of underwing stores de Havilland Vampire F.Mk.3
B.5/47 OR.235 Three-seat twin-engine high-altitude fast jet bomber carrying no defensive armament - Mosquito replacement - revised from B.3/45 (q.v.) to include visual bombing requirement English Electric Canberra B.2
A.6/47 Two-seat Army Helicopter Bristol Type 171
E.8/47 OR.250 Experimental one-half scale research version of Bristol Type 172 four-jet long range bomber design - later revised for reconfigured Type 176 - all subsequently cancelled Bristol Type 174
N.9/47 OR.254 Naval carrier-borne jet fighter/research aircraft Supermarine Type 508, Supermarine Type 529
E.10/47 OR.252 Experimental research jet Fairey Delta 1
T.14/47 OR.159 Two-seat advanced trainer using Merlin 35 - replacement for T.7/45 (q.v.) Avro Athena T.2, Boulton Paul Balliol T.2
R.2/48 OR.231 Reconnaissance flying boat, updated and renumbered as R.112D in 1950s but cancelled. Expected order for PD.2 suspended [45][46] Blackburn B-78,[note 1] Saunders-Roe P.104/Saunders-Roe P.162, developed Short Shetland Short PD.2, Supermarine 524
F.3/48 OR.228 Written for P.1067, replaced F.43/46 Hawker P.1067 (Hawker Hunter), Bristol Type 177
F.4/48 OR.227 Two-seat twin-engined night/all weather fighter - replacement for Vampire NFs de Havilland DH.110, Gloster Javelin
E.6/48 no OR Experimental research aircraft using one-third scale version of Handley Page B.35/46 wing design Handley Page HP.88
E.7/48 Experimental unmanned target aircraft powered by turbojet engine - Queen Martinet replacement Government Aircraft Factory Jindivik
T.8/48 OR.260 ab initio trainer - Tiger Moth replacement - written for Chipmunk T.10 production order de Havilland Chipmunk T.10
B.9/48 OR.231 Four engine jet medium bomber - less advanced stop-gap for B.35/46 designs - written around Valiant Vickers Valiant
T.12/48 Trainer - two-seat Wyvern conversion trainer Westland Wyvern T.3
T.13/48 OR.249 Trainer - multi-engine - replacement for Wellington T.Mk 10 Vickers Varsity T.Mk 1
E.15/48 no OR Experimental one-third scale low-speed research version of Avro's B.35/46 design Avro 707
T.16/48 OR.257 Trainer - Prentice replacement Avro 714, Handley Page H.P.R.2, Percival Provost
B.22/48 OR.302 Pathfinder version of Canberra English Electric Canberra B.5
F.24/48 OR.265 Two-seat twin-engined night/all weather fighter - interim stop-gap for F.4/48 - Meteor NF development originally to F.44/46 (q.v.) Armstrong Whitworth Meteor NF.11
T.1/49 OR.269 Navigation trainer Vickers Valetta T3
T.2/49 OR.244 Dual-control training version of Canberra English Electric Canberra T4
M.6/49 OR.275 Light carrier-borne ASW - written around Short Sturgeon variant - spec derived from GR.17/45 Short S.B.3
E.10/49 Experimental - additional order for Avro 707s including side-by-side seating conversion-trainers - these later cancelled - see also E.15/48 Avro 707
A.13/49 OR.281 Army helicopter Saro Skeeter
N.14/49 NA/A.14 Naval carrier-borne all-weather strike fighter - see also N.40/46 & F.4/48 de Havilland Sea Vixen
F.15/49 OR.277 Jet fighter - interim Vampire replacement de Havilland Venom
E.16/49 OR.282 Swept-wing Mach 2 research aircraft Armstrong-Whitworth AW.58
C.19/49 Transport - Hastings C.2 order Handley Page Hastings C.2
F.23/49 OR.268 Supersonic jet fighter/interceptor English Electric Lightning
H.24/49 Air ambulance helicopter (cancelled) Fairey FB-1 Gyrodyne
U.25/49 Small low speed pilotless target aircraft and launching pad (cancelled replaced by U.120D)
26/49 Replacement for the de Havilland Rapide (cancelled) Blackburn B-84, Folland Fo 134
E.27/49 Delta wing research (Cancelled and replaced with ER.100) Boulton Paul P.120

Post 1949 Specifications and Air Staff Operational Requirements/Targets (OR/ASR/AST)

Spec. OR Year Type Related aircraft
 ER.100 1950 Experimental low-speed research version of English Electric P.1 (q.v.) Short SB5
 M.101 1950 Three-seat anti-submarine aircraft Fairey Firefly AS.7
 ER.103 1947 Experimental research aircraft capable of Mach 1.5 at 36,000 ft - modified for P.1 as F.23/49 (q.v.) English Electric P.1, Fairey Delta 2
 B.104 OR.285 Vickers Valiant B Mk 2
 F.105D Supermarine 545
 N.107 de Havilland Sea Venom FAW22
 UB.109 1951 Expendable Bomber Bristol Type 182
 ER.110T 1952 Variable sweepback research monoplane Bristol Type 183
 N.113D&P Supermarine N.9/47 Development and Production Supermarine Type 544 Scimitar F Mk 1
 N.114 All-weather Naval Fighter
 F.124T 1949 Rocket fighter Bristol Type 178
 EH.125 Percival P.74
 B.126T 1952 Low-level bomber Bristol Type 186
 H.127 Westland-Sikorsky WS-55
 HCC.127 Whirlwind helicopter for Queens Flight
 HCC.127 Whirlwind helicopter for Queens Flight
 C.132 OR.315 Vickers V.1000
 F.137D Avro 720
 F.138D 1953 Mixed rocket-jet interception fighter - written around SR.53 Saunders-Roe SR.53
 F.139 De Havilland Sea Vixen FAW Mk 1
 RH.142 OR.334 195? VTOL transport aircraft Fairey Rotodyne; later cancelled
 ER.143 ~1953 Experimental direct jet-lift VTOL research aircraft Short SC.1
 HR.144 Ultra Light Helicopter Fairey ULH
 HR.146 Development of Bristol 173 for the Royal Navy. Cancelled in favour of Westland Wessex. Bristol Type 191 for the Royal Navy
 M.148 N.A.39 Blackburn Buccaneer S Mk 1
 HR.149 Development of the Bristol 173 for Royal Canadian Navy Bristol Type 193
 H.150 Development of the Bristol 191 for the Royal Air Force Bristol Type 192 as the Westland Belvedere
 F.153D 1953 Fighter (Javelin development) Gloster "thin-wing" Javelin
 F.155T 1955 High-altitude fighter English Electric P.8
 R.156T 1955 Mach 3 reconnaissance aircraft English Electric P.10
 RB.156T Reconnaissance-bomber Avro 730
 ER.163 195? Experimental Fairey Delta 2 with de Havilland Gyron engine - later cancelled Fairey Delta 2
 ER.204D 195? Experimental VTOL aircraft using Bristol Pegasus Hawker P.1127
  OR.301 February 1952 Rocket propelled interceptor Saunders Roe SR.53, Avro 720
  OR.303 195? Lightweight fighter to intercept Soviet Tu-4 bombers Folland Midge
  OR.304 195? Helicopter for Coastal Command Bristol Sycamore
  OR.323 195? Transport aircraft - Hastings replacement Armstrong Whitworth Argosy, English Electric P.14
 B.126T OR.324 1952 Low-level bomber - Spec. B.126T written to this OR - cancelled 1954 Avro 721, Handley Page H.P.99 - proposals also tendered by: Bristol, Shorts & Vickers.
 F.155 OR.329 1955? Supersonic high flying interceptor Fairey "Delta III"; cancelled 1957
  OR.330 1954 Supersonic high flying reconnaissance aircraft Avro 730, Handley Page H.P.100
 RH.142 OR.334 195? VTOL transport aircraft Fairey Rotodyne; later cancelled
  GOR.339 1956 STOL Tactical-Strike/Reconnaissance aircraft capable of Mach 2 and suitable for operation from unpaved strips - Canberra replacement British Aircraft Corporation TSR-2; later cancelled
 FGA.236 GOR.345 195? V/STOL combat aircraft version of Hawker P.1127 - Harrier development Hawker Siddeley Kestrel FGA Mk 1
  OR.351 1960 V/STOL Freighter (NATO NBMR.4) English Electric P.36
  OR.356 19?? Supersonic V/STOL - Spec. SR.250 Hawker Siddeley P.1154; later cancelled
  OR.357 19?? Maritime reconnaissance aircraft - led to Nimrod Hawker Siddeley Nimrod
  OR.362 19?? Supersonic trainer aircraft - led to Jaguar SEPECAT Jaguar
  ASR.365 196? Helicopter - Tactical Support Westland Puma
  ASR.367 196? Bomber - Vulcan B.2 - see also B.35/46 Avro Vulcan B.2
  ASR.368 196? Bomber - Victor B.2 - see also B.35/46 Handley Page Victor B.2
  ASR.371 196? Transport aircraft Short Belfast
  ASR.372 196? Trainer version of Lightning - Lightning T.5 English Electric Lightning T.5
  ASR.373 196? VIP Transport aircraft - Andover CC.2 Hawker Siddeley Andover CC.2
  ASR.376 196? Tanker aircraft Handley Page Victor B(K).1/1A
  ASR.378 196? Transport aircraft - VC10 Vickers VC10
  ASR.381 196? Interim Maritime Patrol aircraft to Spec. MR.254 - written around Atlantique Breguet Atlantique
  ASR.382 196? Two-seat trainer version of P.1154 for RAF - cancelled Hawker Siddeley P.1154
  ASR.384 196? Harrier requirement - see also GOR.345 Hawker Siddeley Harrier
  ASR.385 196? Phantom for RAF McDonnell Douglas F-4M Phantom
  ASR.397 1970 Basic jet trainer - Jet Provost replacement Hawker Siddeley Hawk
  ASR.400 Airborne Early Warning Aircraft Nimrod AEW Mk 3
  ASR.409 Harrier replacement McDonnell Douglas AV-8 as Harrier GR.5
 T.301 AST.412 Jet Provost replacement Short Tucano T Mk 1
  GOR.2 1959 VTOL Strike Reconnaissance aircraft English Electric P.31, Gloster P.505

Naval Requirement/Aircraft (N.A.) and Naval Staff Requirements (NSR)

Spec. Req. Year Type Related aircraft
 U.25/49 NA.03 Small Pilotless Target Aircraft
 N.12/45 NA.07 Single Seat, Long Range, Naval Fighter Aircraft Westland Wyvern TF Mk 2
 N.114T NA.14 2-seat all-weather day/night fighter
 N.9/47 NA.17 16/09/47 Naval Fighter Aircraft Supermarine Type 508, 525 and 529 Scimitar prototypes
 S.14/48 NA.21 09/07/48 Naval Version of Sikorsky S.51 Helicopter Westland Dragonfly HR Mk 1
 19/48P NA.27 Production of a Naval Fighter to E.1/45 Supermarine Attacker F Mk 1
  NA.31 195? Skeeter for RN (A.13/49 Issue 2) Saunders Roe Skeeter
 M.123 NA.32 195? Light carrier-borne ASW to Spec. M.123 Short Seamew
  NA.34 May 1952 Hooked Swift for Carrier Trials
  NA.36 De Havilland Sea Vampire T Mk 22
 M.148 NA.39 08/02/53 Carrier borne strike aircraft to Spec. M.148T Blackburn Buccaneer, Short PD.13
  NA.43 Anti-Submarine and General Purpose helicopter
  NA.47 195? Mixed rocket-jet interception fighter for RN Saunders-Roe SR.177; cancelled 1957
  NSR.6451 19?? V/STOL carrier borne fighter aircraft - Naval Harrier BAE Sea Harrier

General Staff Requirements (GSR) For Aircraft

Spec. GSR Year Type Related aircraft
  GSR.3335 196? Helicopter - Scout replacement Westland Lynx
  GSR.3336 196? Helicopter - Sioux replacement Westland Gazelle

See also


  1. According to Buttler (p.144) no official sources acknowledge the B-78 as being tendered to the specification
  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 London 2003, p.283.
  2. Mason 1992, p. 446.
  3. 3.0 3.1 Mason 1992, p. 123.
  4. Mason 1992, p. 128.
  5. Mason 1992, p. 130.
  6. Mason 1992, p. 119.
  7. 7.0 7.1 7.2 Mason 1992, p. 150.
  8. Mason 1994, p. 106.
  9. Mason 1994, p. 95, 98.
  10. 10.0 10.1 Mason 1992, p. 113.
  11. Mason 1992, p. 116.
  12. Mason 1992, p. 127.
  13. Andrews and Morgan 1987, p. 27.
  14. 14.0 14.1 Mason 1992, p. 124.
  15. Mason 1992, p. 117.
  16. 16.0 16.1 Mason 1994, p. 112.
  17. Mason 1994, p. 113.
  18. 18.0 18.1 Mason 1992, p. 100.
  19. Taylor 1974, p. 67.
  20. Taylor 1974, p. 71.
  21. 21.0 21.1 Mason 1994, p. 89.
  22. Mason 1994, p. 99.
  23. London 2003, pp. 39–40.
  24. Mason 1992, p. 149.
  25. Mason 1992, p. 147.
  26. Mason 1992, p. 145.
  27. Barnes C.H. & James D.N (1989). Shorts Aircraft since 1900. London: Putnam. p. 159. ISBN 0-85177-819-4. 
  28. London 2003, pp. 84–85
  29. London 2003, p. 75.
  30. Andrews and Morgan 1987, p. 87.
  31. Andrews and Morgan 1987, p. 90.
  32. Andrews and Mason 1988, pp. 127–129.
  33. "No allowance sighting". Retrieved 1 February 2007. 
  34. 34.00 34.01 34.02 34.03 34.04 34.05 34.06 34.07 34.08 34.09 34.10 34.11 34.12 34.13 34.14 34.15 34.16 34.17 34.18 34.19 34.20 34.21 34.22 34.23 34.24 34.25 34.26 34.27 34.28 34.29 34.30 34.31 34.32 34.33 34.34 34.35 34.36 Meekcoms/Morgan 1994, pp. 187-202
  35. the requirement is often incorrectly stated to have required the use of Rolls-Royce Vulture engines. For example, by Thetford, Aircraft of the Royal Air Force since 1918, ("Avro Manchester") and Mason, The British Bomber ("Avro Manchester"). It is denied by Buttler, Projects, pp. 100–102 , and Sinnott, Aircraft Design, pp. 165–171.
  36. 36.0 36.1 36.2 Buttler p74-75
  37. Buttler p109-111
  38. Jackson (1974)
  39. 39.0 39.1 Buttler 2004
  40. Buttler, T British Secret Projects - Fighters and Bombers 1935-1950 2004 Midland Publishing. ISBN 1-85780-179-2 p87-88
  41. Buttler, T British Secret Projects - Fighters and Bombers 1935-1950 2004 Midland Publishing. ISBN 1-85780-179-2 p87
  42. 42.0 42.1 Buttler p62
  43. Buttler p.228
  44. Buttler p129-130. HP.66 would have had Hercules 100 engines, HP.69 turbo-supercharged Hercules
  45. London 2003, p.285.
  46. Buttler p144


  • Aeroplane Monthly Magazine. - various articles - various issues 1973-1987. Web site
  • Andrews, C.F. and E.B. Morgan. Supermarine Aircraft since 1914. London: Putnam, 1987. ISBN 0-85177-800-3.
  • Andrews, C.F. and E.B. Morgan. Vickers Aircraft since 1908. London: Putnam, 1988. ISBN 0-85177-815-1.
  • Buttler, Tony. Secret Projects: British Fighters and Bombers 1935-1950 (British Secret Projects 3). Leicester, UK: Midland Publishing, 2004. ISBN 1-85780-179-2.
  • Green, William. Famous Bombers of the Second World War, 2nd Edition. London: MacDonald & Jane's, 1975. ISBN 0-356-08333-0.
  • Jackson, A.J. 1974. British Civil Aircraft since 1919. London: Putnam. ISBN 0-370-10014-X.
  • London, Peter. British Flying Boats. Stroud, UK:Sutton Publishing, 2003. ISBN 0-7509-2695-3.
  • Mason, Francis K. The British Bomber since 1914. London: Putnam, 1994. ISBN 0-85177-861-5.
  • Mason, Francis K. The British Fighter since 1912. Annapolis, Maryland, USA: Naval Institute Press, 1992. ISBN 1-55750-082-7.
  • Meekcoms, K.J. and Morgan, E.B. The British Aircraft Specifications File. London: Air Britain, 1994. ISBN 0-85130-220-3.
  • Munson, Kenneth. Bombers Between the Wars 1919-39 - Including Patrol and Transport Aircraft (Blandford Colour Series). London: Associate R.Ae.S., 1970. ISBN 0-7137-0514-0.
  • Munson, Kenneth. Bombers In Service - Patrol and Transport Aircraft Since 1960 (Blandford Colour Series). London: Associate R.Ae.S., 1972. ISBN 0-7137-0586-8.
  • Munson, Kenneth. Fighters 1939-45 - Attack and Training Aircraft (Blandford Colour Series). London: Associate R.Ae.S., 1975. ISBN 0-7137-0378-4.
  • Munson, Kenneth. The Pocket Encyclopedia of Bombers at War (Blandford Colour Series, New Orchard Edition). London: Associate R.Ae.S., 1977. ISBN 1-85079-028-0. :This is a combined volume made up of the following separate books:
    • Munson, Kenneth.Bombers Patrol and Reconnaissance Aircraft 1914-1919 (Blandford Colour Series) . London: Associate R.Ae.S., 1977. ISBN 0-7137-0632-8.
    • Munson, Kenneth. Bombers Patrol and Transport Aircraft 1939-1945 (Blandford Colour Series) , London: Associate R.Ae.S., 1975. ISBN 0-7137-0379-2.
  • Sinnott, Colin. The RAF and Aircraft Design, 1923-1939: Air Staff Operational Requirements London: Frank Cass, 2001. ISBN 0-7146-5158-3
  • Taylor, H. A. Fairey Aircraft since 1915. London: Putnam, 1974. ISBN 0-370-00065-X.

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