A United States XH-51A helicopter during its experimental flight in the United States.
United States USA Date:1967, July 4 Duration:46 sec Sound:Yes
A United States XH-51A helicopter in the United States. The U.S. Air Force pilot of the helicopter gets in and the helicopter lifts off for an experimental flight. The helicopter sets a speed record of 302 miles per hour during the test flight. Helicopters in flight.
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