A third I-230 airframe was completed early in 1943 with a 1800hp Mikulin AM-39 12-cylinder Vee-type engine and the Izdeliye designation 2D. Apart from the tailplane which was set 20cm lower, this aircraft was basically similar to the first I-230 and retained the same armament of twin synchronised cannon. Assigned the official designation of I-231, the prototype was written off in a landing accident shortly after the completion of factory testing and further development was discontinued.
| WEIGHTS |
| Take-off weight |
3287 kg |
7247 lb |
| Empty weight |
2583 kg |
5695 lb |
| PERFORMANCE |
| Max. speed |
707 km/h |
439 mph |
| Range |
1350 km |
839 miles |
