Dave, John, agreed now that the pusher prop is probably of limited use in autorotation. Most likely it would be feathered to minimise drag, and may well have an overrun clutch. I'll go back and see if i can reword that post to avoid any misinformation.
Dave, i thought that coaxials could suffer reduced yaw control in autorotation for a given pedal movement? The little vector sketch in Prouty shows the rotors in windmill brake state generating some torque, so is probably not that valid. That central rudder will likely overcome any reduced effectiveness though.
CEFOSKEY, that's a shame that the X2 technology is being constrained in the marketplace before it has demonstrated it's potential. Hopefully that armed escort contract will allow this development to market. To my mind it is the right way to go for high speed helicopters.
Last edited by Graviman; 23rd February 2008 at 15:11.