Kinematic and dynamic stability analysis of a model helicopter rotor with a Bell-Hiller mechanism | Hexagon
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Sikorsky's S-97 Raider Helicopter Is a Pirouetting Speedster | WIRED
helicopter
Helicopter rotor - Wikipedia
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feature identification - What are those ball-shaped things on some helicopter blades? - Aviation Stack Exchange
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Animation video of a man spinning along with a helicopter rotor is passed off as real - FACTLY
