Lockheed XH-51
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The Lockheed XH-51 was the designation given to an experimental helicopter design by Lockheed utilizing a fixed rotor. What became known as the XH-51 was the submission of a design, the Lockheed Model 186, for a US military requirment for a high speed research helicopter.
The fixed rotor concept had already been used by Lockheed in an earlier helicopter their CL-475 of 1949.[1]. The choice of a fixed rotor meant that the helicopter was more agile than it would have been with a flapping rotor.
Two XH-51s were built and tested. The second was subsequently converted into a compound helicopter using stub wings and a turbojet engine increasing performance.
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[edit] Survivors
The two XH-51A examples (S/Ns 61-56262 and 61-56263) are stored at Fort Rucker's Army Aviation Museum.[1]
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Designation sequence
H-48 - H-49 - QH-50 - XH-51 - HH-52 - CH-53 - CH-54
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