Retreating blade stall is a hazardous flight condition in helicopters and other rotary wing aircraft, where the rotor blade rotating away from the direction of flight stalls. The stall is due to an excessive angle of attack. Retreating blade stall is the primary limiting factor of a helicopter's airspeed, and the reason even the fastest helicopters can only fly slightly faster than 200 knots (about 370 km/h).
Read more about Retreating Blade Stall: Advancing Vs. Retreating Blades, Compensation, Failure, Flight Performance During A Retreating Blade Stall, Causes of Retreating Blade Stall
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