Morning Graeme
Very long fuselage?
....it does look long I agree
What's that white rod/line just in front of the spats?
....its just a white rod/line! No, its a tie down.
How many built mate?
....no idea. I'll check and revert on that....edit to say "at least 2"
Regarding the ShON. See my other post.....
TsKB is the Central Design Bureau, and various manufacturers built TsKB designs
Certainly in the Osprey tone (which I would regard as the most reliable source) its listed as Grigorovich although it is referred to under Polikarpov. Wiki has it as Polikarpov (
Polikarpov R-5 - Wikipedia, the free encyclopedia).