The XH-51A Compound demonstrated the potential of compound rotorcraft, particularly with regard to speed; this machine achieved 302.6 mph (487 km/h) in 1967 (Lockheed photo) Vertiflite, March/April 2017 (page 51)
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XH-51A Compound (151263) in flight

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The XH-51A Compound demonstrated the potential of compound rotorcraft, particularly with regard to speed; this machine achieved 302.6 mph (487 km/h) in 1967 (Lockheed photo)

Vertiflite, March/April 2017 (page 51)

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