Assertion: helicopter's blade | /r/CapableOf | move at same speed of the blade
Facets:
Source sentences:
text: If the aircraft were to accelerate to the air speed that the blade tips are spinning, the retreating blade passes through air moving at the same speed of the blade and produces no lift at all, resulting in very high torque stresses on the central shaft that can tip down the retreating-blade side of the vehicle, and cause a loss of control.