# HELICOPTER AERODYNAMICSAll explanations is based on counter clockwise rotating rotors viewed

Categories: Helicopter
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12. HELICOPTER AERODYNAMICS(All explanations is based on counter clockwise rotating rotors viewed from above)12.1 HELICOPTER TERMS‚· PLANE OF ROTATIONThe plane in which the rotor blades travel. The plane of rotation is perpendicular to axis ofrotation. In a stable hover flight the shaft axis and axis of rotation will coincide. (See axis ofrotation below)‚· AXIS OF ROTATIONThe line through the rotor head always at right angles (90 degrees) to the plane of rotation.The blades rotate around this axis.‚· ROTORSHAFT AXISThe line extended out of the rotor shaft (mast).

When the helicopter is in a stable hover theaxis of rotation coincide with the rotorshaft axis. (See picture above under Plane ofrotation)For a helicopter in forward flight or any direction for that matter the axis of rotation androtorshaft axis will not coincide.‚· TIP PATH PLANEPlane within which the tips of the rotor blades travel. It is always parallel to the plane ofrotation. Through movement of the cyclic this path can be altered.‚· ROTOR DISCThe circular area created by the spinning blades of a helicopter, when viewed from above itlooks like a disc.

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The rotor disc is manipulated by the pilot to move the helicopter in whichever direction the disc is tilted.‚· ROTOR DISC AREAThis is the total area covered by all the blades while spinning around the axis of rotation.The disc area is not a constant in flight, since it is affected by the coning angle of theblades.‚· DISC LOADINGThe gross weight of the helicopter divided by the disc area, expressed as lb/sq inch orkg/m2 , disc area is not constant in flight, it changes with the coning angle, therefore discloading cannot be a constant.

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