Bisnovat IS-TsAGI Fighter Project

[hesham]

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 ?.

https://military.wikireading.ru/56194

 

[Apophenia]

... After we know SK-1,SK-2 and SK-3,I think it was SK-4 ?.

Since Bisnovat's IS concept predated the SK-3 project, that 'SK-4' assignment seems unlikely.

 

[hesham]

Dear Apophenia,

from Unflown Wings,the engine for first project was M-105 and second
project with S-duct radiator was M-106.

 

[Apophenia]

Sorry hesham. My question was about the SK-3 ... and rather off-topic.

 

[igor-mich]

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 ?.

https://military.wikireading.ru/56194

From the book Shavrov SK-3 engine AM-37. Where did the AM-38 engine come from? Dear hesham, take a closer look!

 

[hesham]

After we know SK-1,SK-2 and SK-3,I think it was SK-4 ?.

By the way,

my speculations are not came from nowhere,but this aircraft was developed
in parallel with SK-3,during 1939.