Yakovlev Ya-21

Last updated
Ya-21
Rolesingle-seat fighter-trainer / high-speed sport aircraft
National origin USSR
Manufacturer OKB Yakovlev
First flightSeptember 1937
Number built1
Developed from Yakovlev UT-1

The Yakovlev Ya-21, (aka UT-21, No.21 or No.25), was a single-seat high-speed sport aircraft / fighter-trainer designed and built in the Soviet Union in the late 1930s.

Contents

Design and development

The Ya-21 was derived from the Yakovlev UT-1, in similar fashion to the Yakovlev AIR-18, by replacing the Shvetsov M-11 radial with an imported 220 hp (160 kW) Renault 6Q-01 inverted 6-cylinder in-line engine. The rear cockpit was enclosed with an aft-sliding canopy, a fixed trousered and spatted undercarriage with spring steel tail-skid was fitted, as well as split flaps and a fixed, forward firing, synchronised 7.62mm ShKAS machine gun in the forward fuselage decking. Plans for re-engining the Ya-25 with a Kossov MG-31F 9-cylinder radial engine were cancelled, due to changing priorities of the customer. [1] [2]

The sole Ya-21 was converted into the No.25 prototype by substituting the imported Renault with a 220 hp (160 kW) Voronezh MV-6 (Renault Bengali copy). The cockpit also differed in having opaque side panels and no sliding hood, with a deeper windshield to house the gunsight. [1]

Production of both the Ya-21 or No.25 was not implemented due to the Yakovlev OKB focusing on combat aircraft, such as the Yakovlev BB-22 and Yakovlev I-26. [1]

Variants

Ya-21
(aka UT-21, No. 21) The sole prototype ( of two intended) fighter-trainer / high-speed sport aircraft powered by a 220 hp (160 kW) Renault 6Q-01 engine.
No.25
The Ya-21 converted to have open cockpit and powered by a 220 hp (160 kW) Voronezh MV-6 engine.

Specifications (Ya-21)

Data from OKB Yakovlev, [1] Yakovlev aircraft since 1924 [2]

General characteristics

Performance

Armament

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References

  1. 1 2 3 4 Gordon, Yefim; Dmitry; Sergey Komissarov (2005). OKB Yakovlev . Hinkley: Midland Publishing. pp.  57-58. ISBN   1-85780-203-9.
  2. 1 2 Gordon, Yefim; Gunston, Bill (1997). Yakovlev aircraft since 1924 (1. publ. ed.). London: Putnam. pp.  53-54. ISBN   0851778720.
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