(WaltBJ) wrote in message . com...
For one, I can see that the cyclic pitch control system is not a
simple setup. In essence you need two sets of them, one for each
rotor, and with modern helicopters you need a double set of hydraulic
actuators, and some way to get the controls to the top rotor
actuators. So - $$$$$.
Walt BJ

Personaly, from an aestheic point of view, I prefer intermeshing
rotors. You avoid the complexities of a tail rotor and a coazial
linkage in a coaxial rotor.

They used to be quite common: Pieseki I think, Kaman and I think the
Germans had a little intermeshing Focker anti submarine unit in
service in WW2 circa 1943/44. What happened?