Dave,
The Hiller had super rigid blades. I am talking about flexible blades with a rigid hub.
The rigid hub works fine with models. We might find it would work with very small and slow helicopters.
If you know of any two blade single rotor with rigid hub, please let me know.
Thanks
slowrotor
Last edited by slowrotor; 20th February 2007 at 23:15.
Reason: added "two blade"