Closeup of the rotor and gearbox of a Sikorsky S-64 Skycrane heavy-lift helicopter.
Previously:
Helicopter rotor balancing tool - photo
UH-60 Black Hawk helicopter rotor up close - photos
Helicopter dolly - GIF
Helicopter ballistic parachute - GIF
Sea stallion rotor cuts its own refueling probe - video
Helicopter rotors collide - GIF
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