Avia B.122

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Avia Ba.122.jpg
Role Trainer
Manufacturer Avia
Designer František Novotný
First flight 1934

The Avia B.122 Vosa ("Wasp") was a Czechoslovak single-seat biplane trainer aircraft, which was developed in the mid-1930s. It saw some service in the first years of World War II.


In the spring of 1934, the Czechoslovak Army Command decided that some Czechoslovak Air Force pilots would participate in the international aerobatic competition Coupe Mondial. For this purpose, the Czechoslovakian aircraft manufacturer Avia was given the task of designing and constructing an aircraft. The prototype, B.122, was presented after only six weeks.

The Czechoslovak pilots had only a few weeks to learn and master the aircraft as the competition was to be held in July 1934. Luckily, the design was quite successful and the Czechoslovak pilots managed to win the 4th and the 8th place in the competition.

Afterwards, the aircraft was modified, based on the pilots' inputs, and this resulted in the improved version, Ba 122. The Ba.122 was equipped with a larger rudder and had a more powerful engine. This version went into production and 35 aircraft were built. In the 1936 Summer Olympics in Berlin, Czechoslovak pilots took 2nd, 3rd and 8th place with their Avias. Some of these aircraft were equipped with nine-cylinder Walter Pollux engines instead of the seven-cylinder Castor. 1937 was also a successful year, as the Avias managed to take 1st and 3rd place at the International Flying Meeting in Zurich in July/August 1937. These successes led to export orders from the Soviet Union and Romania. The aircraft was later further developed into prototypes Ba.222, Ba.322 and Ba.422. The Czech Ministry of Defence ordered 45 Bs.122 trainers. However, the outbreak of World War II put an end to further development. Some Avias ended up in the German Luftwaffe when parts of Czechoslovakia were absorbed into Germany in 1939. Other aircraft were sold to the Slovakian and Bulgarian air forces.


Military variant of the B.122
Improved variant with Avia Rk-17 engine
Ba.122 with NACA cowling
Experimental variant, with enclosed cockpit and Townend cowling
Prototype, another prototype was called Ba.422.2


Bulgarian Air Force - 12 aircraft taken over from the Czechoslovak Air Force
Czechoslovakian Air Force - 45 Bs.122 and 35 Ba.122 aircraft
Luftwaffe - 12 aircraft taken over from the Czechoslovak Air Force
Royal Romanian Air Force
Slovak Air Force (1939-1945)
 Soviet Union
Soviet Air Force - 15 Ba.122 aircraft

Specifications (Ba.122)[edit]

Data from Jane's All the World's Aircraft 1938[1]

General characteristics

  • Crew: one
  • Length: 6.80 m (22 ft 4 in)
  • Wingspan: 8.85 m (29 ft 0.5 in)
  • Height: 2.84 m (9 ft 4 in)
  • Wing area: 22.55 m² (242.7 sq ft)
  • Loaded weight: 1080 kg (2381 lb)
  • Powerplant: 1 × Avia Rk-17 9-cylinder radial, 260 kW (350 hp)


Related lists


  1. ^ Grey, C.G. (1972). Jane's All the World's Aircraft 1938. London: David & Charles. pp. 89c–90c. ISBN 0-7153-5734-4.