HELICOPTER - VIBRATIONS AND RESONANCE, PT 3, VIBRATIONS IN THE H-21

Duration: 15 min

Year Published: 1957

Creator: Department of the Air Force (Department of Defense)

Color: B&W

Sound: Optical sound

Description: Tell-tale vibrations in the H-21 are demonstrated, and traced to the cause.

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Record added: 2026-07-01 03:45:48