|Engines||640hp Wright- Cyclone 9||712hp Wright- Cyclone SGR1820-F3 or M-25|
|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|
|Guns||2*37mm APK-37||2*45mm APK-11
Successful trials of the I-14 allowed the team to proceed with upgraded prototype, I-14bis. Design included several changes:
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.