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McDonnell XH-20 Little Henry
The McDonnell XH-20 Little Henry was a 1940s American experimental lightweight helicopter designed and built by McDonnell Aircraft.〔
==Development==
The McDonnell Model 38 was a lightweight experimental helicopter sponsored by the United States Army Air Force to test the concept of using small ramjets at the tips of the rotor blades.〔 As a functional helicopter it was of simple open-frame steel-tube construction.〔 Allocated the military designation XH-20 the first of two first flew on the 29 August 1947.〔
Although the XH-20 flew successfully the ramjets were noisy and burnt a large amount of fuel and plans to build a larger two-seat XH-29 were abandoned.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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