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 |
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