rotor blade
51rigid rotor — A rotor head that allows the blades freedom to feather but not to flap or lead lag. The rotor head has to absorb all the forces generated during flight maneuvers. Control loads in this type of rotor head are high; however, this type imparts the… …
52retreating-blade stall — The stall of a helicopter rotor disc that occurs starting at the tip of the retreating blade. This happens when the helicopter forward speed is high. The individual angle of attack of the retreating blade becomes larger because the downward blade …
53cross-beam rotor — Usually the tail rotor of a helicopter comprising a two blade assembly, superimposed on each other. The angle at which rotors are superimposed is normally 90°, but this superimposition can be at other angles as well …
54diving blade — A blade track of a helicopter’s main rotor that lowers with an increase in RPM …
55stator blade — The fixed/variable incidence blade attached to the axial flow compressor stator casing. The first stage of the stators normally is variable incidence, whereas the later stages are fixed. They help direct the airflow at the optimum angle onto the… …
56pre-coning — Rotor blades in which the coning angle has been accommodated in the design itself. The coning angle is the angle between a rotor blade and a plane passing through the rotor hub or at right angles to the lift vector. See coning angle …
57Helicopter — For other uses, see Helicopter (disambiguation). Helicopter An LAPD Bell 206 …
58helicopter — /hel i kop teuhr, hee li /, n. 1. any of a class of heavier than air craft that are lifted and sustained in the air horizontally by rotating wings or blades turning on vertical axes through power supplied by an engine. v.i. 2. to fly in a… …
59Wind turbine design — An example of a wind turbine, this 3 bladed turbine is the classic design of modern wind turbines Wind turbines History Design …
60Dissymmetry of lift — in rotorcraft aerodynamics refers to an uneven amount of lift on opposite sides of the rotor disc. It is a phenomenon that affects single rotor helicopters in lateral flight, whether the direction of flight be forwards, sideways or in reverse.… …
