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Retreating blade stall
Retreating blade stall is a hazardous flight condition in helicopters and other rotary wing aircraft, where the rotor blade with the smaller resultant relative wind exceeds the critical angle. Any 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).
==Advancing vs. retreating blades==
A rotor blade that is moving in the same direction as the aircraft is called the ''advancing blade'' and the blade moving in the opposite direction is called the ''retreating blade.''
Balancing lift across the rotor disc is important to a helicopter's stability. The amount of lift generated by an airfoil is proportional to the square of its airspeed. In a zero airspeed hover the rotor blades, regardless of their position in rotation, have equal airspeeds and therefore equal lift. In forward flight the advancing blade has a higher airspeed than the retreating blade, creating unequal lift across the rotor disc.
A fuller treatment is provided in dissymmetry of lift.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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