Rings of power crash2/23/2023 ![]() ![]() As the inner blade sections stall, a second set of vortices, similar to the rotor tip vortices, form in the center of the rotor system, and combined with the outer set of vortices, result in severe loss of lift. As volume of upflow increases, the induced flow (air pulled or "induced" down through the rotor system) of the inner blade sections is overcome and the blades begin to stall near the hub. As forward airspeed decreases and vertical descent rates increase, an upflow begins because there are no airfoil surfaces in the mast and blade grip area. ![]() In forward flight with translational lift, there is no upward flow ( upflow) of air in the hub area. The helicopter shown is the RAH-66 Comanche. ![]() The curved arrows indicate airflow circulation about the rotor disc. ![]()
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