Mikoyan/Gurevich I-231

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