Terminology / Helicopter Aerodynamics Stall Low RPM stall occurs when rotor RPM slows down to 80%+1%/1000 ft. Excess of critical angle of attack stall occurs due to too much pitch angle. It's more possible under high density altitude. Source: The Way to a Certificate of Helicopter, http://home.att.ne.jp/gamma/fujiwara/index-e.htm

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