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Military


H-20 Little Henry / H-29

The McDonnell "Little Henry" (XH-20) was the world's first ram-jet helicopter It was powered with ram-jets mounted at the tips of the rotor blades. It had no tail rotor and weighed only 280 pounds. 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 tip-driven rotor eliminated the need for a torque-compensating tail rotor. The XH-20 was a low-cost research prototype employing open-frame, steel-tube construction.

Little Henry was not a success because ramjets were too noisy and used too much fuel, so only two test models were built. The XH-20 was cancelled due the heavy consumption of fuel.

A proposed H-29 improved version was cancelled



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Page last modified: 07-07-2011 02:32:28 ZULU