Old Small USSR aircraft – not Kalinin K-1

Hi all,

while everybody contemporarily watches events in Ukraine, nearly 100 years ago aircraft construction started there. One of the creators was Konstantin Kalinin, who later fell victim to Stalin’s purges. The quoted article

https://kpi.ua/en/1936-k15

tells about his work, but the aircraft in the picture on top is not mentioned in it, as much I can extract. It is NOT Kalinin’s K-1 (as mentioned in the description, if you don’t believe, please google).

It must be a very early light USSR aircraft and very probably connected with the Kiev Polytechnic Institute, where Kalinin was working.

If one of you could tell me the correct designation, I would be very glad!

Thank you, and best regards,
RT