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Hi,
V.B. Shavrov mentions the project of the SK-3 aircraft, developed by the same design team, with the AM-38 engine.
There was another project - the IS-TsAGI fighter (named so in contrast to the IS aircraft of V.V. Nikitin), proposed by Bisnovat Design Bureau on August 2 in order to participate in the 1939-1940 fighter competition.
Initially, the design of the aircraft was far from the possibility of mass production. So, the fuselage spars and the shelves of the rear spar of the wing were supposed to be made of ... bamboo! The lack of industrial reserves of the latter on the territory of the USSR instantly decided the fate of this option. The second option, which began designing on September 15, 1939 and retained the general concept, layout and structural solutions of the first, had smaller geometric dimensions
and became all-metal from solid wood.
After we know SK-1,SK-2 and SK-3,I think it was SK-4 ?.
V.B. Shavrov mentions the project of the SK-3 aircraft, developed by the same design team, with the AM-38 engine.
There was another project - the IS-TsAGI fighter (named so in contrast to the IS aircraft of V.V. Nikitin), proposed by Bisnovat Design Bureau on August 2 in order to participate in the 1939-1940 fighter competition.
Initially, the design of the aircraft was far from the possibility of mass production. So, the fuselage spars and the shelves of the rear spar of the wing were supposed to be made of ... bamboo! The lack of industrial reserves of the latter on the territory of the USSR instantly decided the fate of this option. The second option, which began designing on September 15, 1939 and retained the general concept, layout and structural solutions of the first, had smaller geometric dimensions
and became all-metal from solid wood.
After we know SK-1,SK-2 and SK-3,I think it was SK-4 ?.
ИС-ЦАГИ (проект). Мир Авиации 2002 02
military.wikireading.ru