Assertion: helicopter's blade | /r/HasSubevent | high torque stresses
Facets:
value: very
type: DEGREE
value: on the central shaft
type: LOCATION
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.