Originally Posted by
CEFOSKEY
XH-59B was a proposed variant similar to the X2TD + Piasecki speedhawk, a ducted fan pusher prop configuation, however transmission tech at the time was the limiting factor back in 1983 (or so Ive been told by a few "old timers").
Sikorsky has not been claiming new transmission technology as part of the X2 suite. Reference this quote from the Sikorsky website:
The Sikorsky X2 TECHNOLOGY™ demonstrator aircraft will incorporate several new technologies and demonstrate them in a flight environment. These technologies include an integrated Fly-by-Wire system that allows the engine/rotor/propulsor system to operate efficiently, with full control of rotor rpm throughout the flight envelope, high lift-to-drag rigid blades, low drag hub fairings, and Active Vibration Control.
Found here:
Sikorsky X2 info
-- IFMU