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Lockheed XH-51A Rigid Rotor Helicopter - Contractors Desk Model ** RARE** | eBay
One of only a few ever made prototype contractors model for Lockheed! It first took flight in 1962. The XH-51 was a specialized test-bed for technologies developed in joint research between the US Army and Navy.It was a three-bladed, single-engine helicopter that made use of a rigid rotor.
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