Hi Graeme. Yes, it has been snowing here and many cars are having difficulty getting up the road that passes next to my house, but it is nice and warm in the house. You have it is indeed the Bartini Stal'7, well that is what the reference says from which I got the drawing.
Only one aircraft was built, in the workshops of ZOK, the factory for GVF experimental construction. The first flight was made on an unrecorded date in autumn 1936, the pilot being N P Shebanov. Performance was outstanding, and Shebanov proposed attempting a round-the-world flight. In 1937 the Stal-7 was fitted with 27 fuel tanks with a total capacity of 7,400 litres (1,628 Imperial gallons, 1,955 US gallons). A maximum-range flight was then attempted, but - possibly because of structural failure of a landing gear - the aircraft crashed on take-off. Bartini was arrested, and was placed in detention
You have control.
Mel