The XH-51A was flown under a joint US Army-Navy program, ably demonstrating the potential of the rigid rotor for military applications. It debuted with a three-bladed rotor (shown here), while all models had retractable skids.

Vertiflite, March/April 2017 (page 50)

Lockheed XH-51A with 3-blade rotor

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The XH-51A was flown under a joint US Army-Navy program, ably demonstrating the potential of the rigid rotor for military applications. It debuted with a three-bladed rotor (shown here), while all models had retractable skids.

Vertiflite, March/April 2017 (page 50)

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