Avia S-199

S-199
Role	Fighter aircraft
Manufacturer	Avia
Designer	Messerschmitt
First flight	March 1947
Retired	1957
Primary users	Czechoslovak Air Force Israeli Air Force
Produced	1947-1949
Number built	603
Developed from	Messerschmitt Bf 109

The Avia S-199 was a propeller-driven fighter aircraft built after World War II by the two aircraft factories in Czechoslovakia: one of them officially called závod Avia (Avia Plant) (1946–48) and závod Avia-Jiřího Dimitrova (Avia-George Dimitroff-Plant) (1948–49) in Čakovice near Prague, as a post-war corporative part of the Automobilové závody, n.p. (Automotive Works, National Corp.), and the other one called závod Vysočany (Vysočany Plant) (1948–49) in Prague, as a corporative part of Letecké závody, n.p. (Aviation Works, National Corp.). It was constructed with parts and plans left over from Luftwaffe aircraft production that had taken place under the country's German occupation during the war. Despite the aircraft's numerous problems and unpopularity with its pilots, it achieved fame as the first fighter obtained by the Israeli Air Force, for use during the 1948 Arab-Israeli War. Czechoslovak pilots nicknamed it Mezek ("Mule"), while in Israel it was officially known as the Sakeen ("knife" in Hebrew). In practice, the aircraft was more often called Messerschmitt or Messer (which also means "knife", in German and Yiddish).

Design and development

Junkers Jumo 211F Engine

Avia continued building Messerschmitt Bf 109G-6s after the war under the Avia S-99 name, but soon ran out of the 109's Daimler-Benz DB 605 engine after many were destroyed during an explosion at a warehouse in Krásné Březno. The S-199 continued to use the Bf 109G airframe but, with none of the original engines available, an alternative engine had to be used. It was decided that as a replacement for the original engine, the aircraft would use the same engine (Junkers Jumo 211 F) and propeller as the Heinkel He 111 bomber. The resulting combination of parts was an aircraft with extremely poor handling qualities. The substitute engine with the propeller lacked the responsiveness of the Daimler-Benz unit and the torque created by the massive paddle-bladed propeller made control very difficult. This, in combination with the 109's narrow-track undercarriage, made landings and take-offs extremely hazardous.

The Daimler-Benz DB 605 engine allowed for a central cannon mount (Motorkanone in German) that fired through the propeller spinner. This was not possible with the Junkers Jumo 211, and so the S-199 used a version of the Luftwaffe's Rüstsatz VI modification kit, which consisted of a pair of MG 151 cannon, one each in a gun pod, one beneath each wing. This further impinged on the aircraft's performance. A final hidden danger lay in the gun synchronizer for the cowl-mounted MG 131 machine guns, which did not work as it was meant to, leading a few Israeli aircraft to shoot off their own propellers.

Around 550 S-199s were built, including a number of conversion trainers designated CS-199 (armed) and C-210 (unarmed). The first flight took place in March 1947, and production ended in 1949. The last examples were withdrawn from Czechoslovak service (with their National Security Guard) in 1957.

Operational history

Israeli service

Israeli Avia S-199, 1948

Israeli agents negotiated the purchase of Avia S-199s from the Czechoslovak government in defiance of an arms embargo that Israel faced at the time. Twenty five aircraft were obtained and all but two were eventually delivered. The price for a fully equipped plane was $190,000. The first examples arrived on May 20, 1948, six days after Israel's declaration of independence and five days after the commencement of hostilities by Egypt. Forming Israel's first fighter squadron, they were assembled and sent into combat for the first time on May 29, attacking the Egyptian army between Isdud and the Ad Halom bridge, south of Tel Aviv. A few days later, on June 3, the type scored the Israeli Air Force's first aerial victories when Modi Alon shot down a pair of Royal Egyptian Air Force C-47s which had just bombed Tel Aviv.

The type proved unreliable and performed poorly in combat. One Avia pilot remarked "she tried to kill us on every take off and landing."^{[citation needed]} Furthermore, maintenance problems meant that no more than five were typically airworthy at any one time. The type, however, scored victories over its opponents, including the Spitfire. The Avias were mostly withheld from service by the end of October, at which time only six remained operational. The S-199 continued making sporadic sorties through mid-December; American pilot Wayne Peake flipped one on its back on December 15.

Variants

Avia CS-199; Prague Aviation Museum, Kbely

Avia S-99

Messerschmitt Bf 109G-6 variant assembled postwar in Czechoslovakia. Avia factory designation was C.10, 21 aircraft completed.

Avia CS-99

Training variant of Avia S-99 based on idea of training Messerschmitt Bf 109G-12 variant. Avia factory designation was C.10, 23 aircraft completed.

Avia S-199

Avia S-99 powered by Junkers Jumo 211F engine, main production variant. Avia factory designation was C.210, 559 aircraft completed.

Avia CS-199

Two-seat training variant rebuilt from Avia S-199.

Avia D-199

Recognition version.

Operators

Avia S199 with Czechoslovakian markings

Czechoslovakia

• Czechoslovakian Air Force
• Czechoslovakian National Security Guard

Israel

• Israeli Air Force
  • 101 Squadron

Survivors

Today at least three aircraft are preserved. Both S-199 (UF-25, sn.178) and CS-199 (UC-26, sn.565) are displayed in Prague Aviation Museum, Kbely [1] and a sole S-199 example is preserved at the Israeli Air Force Museum at Hatserim Israeli Air Force Base.

Specifications (S-199)

General characteristics

• Crew: 1
• Length: 8.94 m (29 ft 4 in)
• Wingspan: 9.92 m (32 ft 6 in)
• Height: 2.59 m (8 ft 6 in)
• Wing area: 16.2 m² (174 ft²)
• Empty weight: 2,650 kg (5,840 lb)
• Max. takeoff weight: 3,740 kg (8,245 lb)
• Powerplant: 1 × Junkers Jumo 211F liquid-cooled inverted V-12, 986 kW (1,340 PS - 1322 hp)

Performance

• Maximum speed: 590 km/h (320 kn, 370 mph)
• Combat radius: 850 km (530 mi)
• Service ceiling: 8,686 m (28,500 ft)
• Rate of climb: 11 m/s (2,200 ft/min)
• Wing loading: 231 kg/m² (47.3 lb/ft²)
• Power/mass: 321 W/kg (0.195 hp/lb)

Armament

• Guns:
  
  • 2× 13 mm MG 131 machine guns
  • 2× MG 151/20 cannons
• Bombs:
  
  • 1× 250 kg (551 lb) or
  • 4× 70 kg (155 lb) bombs

See also

• Messerschmitt Bf 109
• Hispano Aviación HA-1112
• Supermarine Spitfire
• Yakovlev Yak-9
• List of fighter aircraft

External links

• The Avia S-99 and the Avia S-199
• 101 Squadron's Avia S-199s
• valka.cz forum with more pictures and further information
• Yaakov, Katz (July 16, 2012). "'It was all destiny' - One of last surviving founders of IAF recalls mission that stopped Egypt from advancing on Tel Aviv". The Jerusalem Post. http://www.jpost.com/Defense/Article.aspx?id=277611.