The last of the "A" series high-altitude fighter prototypes to enter flight test, the I-224 was flown for the first time on 20 October 1944. Powered by a Mikulin AM-39B engine rated at 1750hp for take-off, driving an 3.50m diameter propeller with 40cm chord "paddle" blades, and equipped with a single TK-300B turbo-supercharger on the starboard side, the I-224 carried an armament of two synchronised 20mm ShVAK cannon.
A feature of the I-224 was its exhaust system which included four fixed rear facing ejection "chimneys". The I-224 achieved an altitude of 14,100m during its brief flight test programme which reportedly terminated when a malfunctioning supercharger resulted in an uncontrollable engine fire.
Engine: Mikulin AM-39B, 1750hp
Max take-off weight: 3921 kg / 8644 lb
Empty weight: 3105 kg / 6845 lb
Wingspan: 13.00 m / 42 ft 8 in
Length: 9.51 m / 31 ft 2 in
Height: 3.60 m / 11 ft 10 in
Wing area: 22.44 sq.m / 241.54 sq ft
Max. speed: 693 km/h / 431 mph
Ceiling: 14100 m / 46250 ft
Range: 1000 km / 621 miles