The SK-2 single-seat fighter was evolved from the SK-1 (skorostnoye krylo, or high-speed wing) aircraft tested during the winter of 1939-40 as a direct result of high-speed wing research conducted at the TsAGI (Central Aerodynamics and Hydrodynamics Institute) by a team headed by Matus Bisnovat.
The SK was the smallest possible airframe capable of accepting a 12-cylinder Vee engine, with every effort made to reduce drag (eg, a flush-fitting cockpit canopy which could be raised, together with the pilot's seat, for takeoff or landing).
The SK-2, flown in October 1940, had a similar small-area wing and 1050hp Klimov M-105 12-cylinder liquid-cooled Vee engine, but with an orthodox cockpit, conventional carburettor and oil cooler air intakes, revised vertical tail surfaces and an armament of one 7.62mm and two 12.7mm machine guns. The SK-2 was of all-metal construction with dural pressed sheet stressed wing skinning and a semi-monocoque fuselage. Flight test results were allegedly promising, but not enough to warrant replacing established fighter types in production.
Engine: 1 x 1050hp Êëèìîâ Ì-105
Take-off weight: 2300 kg / 5071 lb
Empty weight: 1850 kg / 4079 lb
Wingspan: 7.30 m / 24 ft 11 in
Length: 8.28 m / 27 ft 2 in
Height: 2.60 m / 9 ft 6 in
Wing area: 9.57 sq.m / 103.01 sq ft
Cruise speed: 530 km/h / 329 mph
Ceiling: 10500 m / 34450 ft
Range: 620 km / 385 miles
Armament: 1 x 7.62 mm, 2 x 12.7mm mg