Helicopter blade angle checking tool.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
Previously:
Helicopter main rotor blade flex - GIF
UH-60 Black Hawk helicopter rotor up close - photos
Helicopter rotor balancing tool - photo
AS350 helicopter rotor animation - GIF
Helicopter rotors collide - GIF
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