Shishmarev and Korvin MK-21

[VictorXL188]

Hi guys,
Hope someone on here may be able to help me. When looking through 'The Red Falcons' book by Robert Jackson, he mentions that the first two designs to be submitted to the NII VVS in 1921 were the Grigorovich I-1 and the Shishmarev and Korvin MK-21. This latter design seems to be a bit of a mystery and I have yet to find any illustrations of it. Does anyone, by any chance have any illustrations, or even a basic description of the type?

 

[ucon]

Maybe you mean MK-1? = Rybka

 

[Ifor]

Does this help?
http://ram-home.com/ram-old/mk-1rybka.html

 

[VictorXL188]

Does this help?

MK-1 Rybka, V.L.Korvin

Thanks for that Ifor