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)
Added to Vertiflite Images and categorized in Aircraft/Overviews — 5 years ago
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