McDonnell XH 20 Little Henry 1947

Sponsored by the U.S. Army Air Forces/U.S. Air Force, the McDonnell XH-20 Little Henry proved that helicopters could fly using ramjets located in the tips of their rotor blades.
The XH-20 was a low-cost research prototype employing open-frame, steel-tube construction. The tip-driven rotor eliminated the need for a torque-compensating tail rotor. It did not need a transmission and was controlled with a rudder.
Little Henry was not a success because ramjets were too noisy and used too much fuel, so only two test models were built. One of the XH-20s is on display at the National Museum of the U.S. Air Force at Wright Patterson Air Force Base, Ohio

[@michaelberry950]

No tail rotor because the tip engines generate no torque? Mystery to me

[@flygliders]

Thanks for the feedback, Roy

[@macgyvercreativesoluhtions5092]

Because the thrust comes directly from the propeller, therefore it is not forcing the body of the helicopter in the opposite direction.

[@macgyvercreativesoluhtions5092]

It's turbines that move it

[@macgyvercreativesoluhtions5092]

very creative