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Yokosuka K5Y
Role Intermediate trainer
Manufacturer Various, see text
First flight 1933
Introduction 1934
Primary user Imperial Japanese Navy Air Service
Produced 1934-1945
Number built 5,770


The Yokosuka K5Y was a two-seat unequal-span biplane trainer (Allied reporting name: "Willow") that served in the Imperial Japanese Navy during World War II. Due to its bright orange paint scheme (applied to all Japanese military trainers for visibility), it earned the nickname "aka-tombo", or "red dragonfly", after a type of insect common throughout Japan.

Design and development

The aircraft was based on the Yokosuka Navy Type 91 Intermediate Trainer, but stability problems led to a redesign by Kawanishi in 1933. It entered service in 1934 as Navy Type 93 Intermediate Trainer K5Y1 with fixed tail-skid landing gear, and remained in use throughout the war. Floatplane types K5Y2 and K5Y3 were also produced. After the initial 60 examples by Kawanishi, production was continued by Watanabe (556 aircraft built), Mitsubishi (60), Hitachi (1,393), First Naval Air Technical Arsenal (75), Nakajima (24), Nippon (2,733), and Fuji (896), for a total of 5,770. These aircraft were the mainstay of Imperial Japanese Navy Air Service's flight training, and as intermediate trainers, they were capable of performing demanding aerobatic maneuvers. Two further land-based versions, the K5Y4 with a 358 kW (480 hp) Amakaze 21A engine and the K5Y5 with a 384 kW (515 hp) Amakaze 15, were projected but never built.[1]


  • Floatplane version, with Amakaze 11 engine.
  • Floatplane, with 384 kW (515 hp) Amakaze 21.
  • Projected land-based version with 358 kW (480 hp) Amakaze 21A. Never built.
  • Projected land-based version with 384 kW (515 hp) Amakaze 15. Never built.




  • Indonesian People's Security Force operated derelict aircraft against Dutch colonial rule. On 29 July 1947, Indonesia beside using Guntei and Planned,Hayabusa.Indonesia also use 2 units Yokosuka K5Y(Called "Cureng/Churen" by Indonesian fighters) from Maguwo Air Force Base, Yogyakarta for bombing Dutch strategic positions in Ambarawa, Salatiga and Semarang. It is currently on display at Jakarta.

Specifications (K5Y1)

Data from Japanese Aircraft of the Pacific War[2]

General characteristics

  • Crew: Two
  • Length: 8.05 m (26 ft 5 in)
  • Wingspan: 11.00 m (36 ft 1 in)
  • Height: 3.20 m (10 ft 6 in)
  • Wing area: 27.7 m² (298.2 ft²)
  • Empty weight: 1,000 kg (2,205 lb)
  • Max. takeoff weight: 1,500 kg (3,307 lb)
  • Powerplant: 1 × Hitachi Amakaze 11 nine-cylinder air-cooled radial engine, 224 kW (300 hp)


  • Maximum speed: 212 km/h (115 knots, 132 mph)
  • Cruise speed: 138 km/h (75 knots, 86 mph)
  • Range: 1,019 km (550 nmi, 633 mi)
  • Service ceiling: 5,700 m (18,700 ft)
  • Climb to 3,000 m (9,845 ft): 13 min 32 sec


  • Guns: 1× fixed, forward-firing 7.7 mm (.303 in) Type 89 machine gun and 1× flexible, rearward-firing 7.7 mm (.303 in) Type 92 machine gun
  • Bombs: Up to 100 kg (220 lb) of bombs on external racks

See also


  1. Francillon 1979, p. 446.
  2. Francillon 1979, p. 448.
  • Collier, Basil. Japanese Aircraft of World War II. London: Sidgwick & Jackson, 1979. ISBN 0-283-98399-X.
  • Francillon, R.J. Japanese Aircraft of the Pacific War. London: Putnam & Company Ltd., 1970 (2nd edition 1979). ISBN 0-370-30251-6.
  • Mondey, David. The Concise Guide to Axis Aircraft of World War II. London: Chancellor Press, 1996. ISBN 1-85152-966-7.
  • Tagaya, Osamu. Imperial Japanese Naval Aviator, 1937-45. Botley, Oxfordshire, UK: Osprey Publishing, 2003. ISBN 1-84176-385-3.

External links

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