Technical data
Type I-14bis, ANT-31bis
Function Fighter
Year 1934
Crew 1
Engines 640hp Wright- Cyclone 9 712hp Wright- Cyclone SGR1820-F3 or M-25
Length 6.1m
Wingspan 11.2m
Wing area 16.9m2
Empty weight 1169kg 1170kg
Loaded weight 1524kg 1540kg
Wing Load (kg/m2) 89.7 90.5
Power load (kg/hp) 2.38 2.17
Speed at 0m 323km/h 375km/h
Speed at 3000m 414km/h 449km/h
Turn time 14.0sec 14.0sec
Landing Speed - 146km/h
Landing Roll 320m 320m
Takeoff Roll - 230m
Ceiling 7200m 9430m
Climb
5000m 9.6min 6.5min
Armament
Guns 2*37mm APK-37 2*45mm APK-11
2*7.62mm ShKAS

ANT-31bis, I-14bis, P.O.Sukhoj ( A.N.Tupolev bureau)

Series I-14bis (b/w 44k) "History of aircraft construction in the USSR", Vol.1 p.490

Successful trials of the I-14 allowed the team to proceed with upgraded prototype, I-14bis. Design included several changes:

Pre-series I-14bis was powered with 640hp Wright-Cyclone 9 engine and armed with two APK-37 cannons.

Production aircraft had 712hp Wright-Cyclone SGR-1820-F-3 or its Soviet-built copy M-25. Armament was increased to pair of 45mm APK-11 and two 7.62mm ShKAS machineguns.

Performance was high, but spin delays of the I-14 were not eliminated. Narrow wheel base was also a disadvantage - all Soviet fighters for decades will be designed to operate from unpaved airstrips.

Assembly of 55 aircraft was started, but only 18 were transferred to fighter units, because powerful competitor - famous Polikarpov I-16 rolled out. And it was superior to ANT-31bis in all respects, except stability on tight turns.



References:
  • "History of aircraft construction in the USSR", Vol.1 p.490-491;

  • Modified January 27, 1998
    and Sergey Andreev;
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