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Lockheed XH-51 by
Miloch
https://en.wikipedia.org/wiki/Lockheed_XH-51
The Lockheed XH-51 (Model 186) was an American single-engine experimental
helicopter designed by Lockheed Aircraft, utilizing a rigid rotor and
retractable skid landing gear. The XH-51 was selected as the test vehicle for a
joint research program...
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