Originally Posted by
Ascend Charlie
Would a 5-blade head be susceptible to RBS anyway?? Always 2 blades on retreating side to share the load.
No sure about that explanation. Typically you would say that for the same lift a rotor with more blades can be smaller in diameter, and can turn faster. As the retreating blade stalls when the airspeed of the a/c approaches the speed of the rotor blade relative to the airframe, that point it reached at higher airspeeds in a rotor that spins faster.