coaxial Sikorsky

[feathering]

Didn't realise that coaxial helicopters are in active development. I thought there were certain technical limitations that made them unpopular.

[URL]https://www.youtube.com/watch?v=j3njDrUtT8k[/URL]

[scallybert]

It has two obvious differences: the pusher propeller; and the main rotors are closer to each other and the fuselage than they are on other co-axials. These may be related to each other...

[Mike Sanders]

A scale model would be interesting. Not for a BMFA test though.