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Since the lift generated by an aerofoil increases as its relative airspeed increases, on a forward-moving helicopter the blade-tip at position A produces more lift than that at point B. So the rotor disc produces more lift on the right hand side than on the left hand side (for an American-style helicopter). This imbalance is "dissymmetry of lift".
Dissymmetry of lift is an aerodynamic phenomenon caused by the rotation of a helicopter's rotors in forward flight. Rotor blades provide lift proportional to the amount of air flowing over them. When viewed from above, the rotor blades move in the direction of flight for half of the rotation (advancing half), and then move in the opposite ...
In normal operating circumstances, forward flight results in flapback caused by dissymmetry of lift and the transverse flow effect. [ 2 ] : 2–20 Dissymmetry of lift is where the forward-moving rotor blade has a faster airspeed, so it generates more lift, which would cause the rotor disc to tilt to the side.
Retreating blade stall is a hazardous flight condition in helicopters and other rotary wing aircraft, where the retreating rotor blade has a lower relative blade speed, combined with an increased angle of attack, causing a stall and loss of lift. Retreating blade stall is the primary limiting factor of a helicopter's never exceed speed, V NE. [1]
Black Hawks are the primary medium-lift and air assault helicopter for the Army. They are manufactured by Sikorsky and made their debut in 1979. There are around 4,000 Black Hawks deployed around ...
The helicopter, which was operated by Orbic Air LLC of Burbank, had taken off from Palm Springs International Airport at 8:45 p.m. and was bound for Boulder City, Nev., Graham said.
Washout near the tips can also be used to decrease lift-induced drag, since at a lower angle of incidence, the lift produced will be lower, and thus the component of that lift which acts against thrust is reduced, however, it has been theorised by Albion H. Bowers that certain washout characteristics in the tips, that lead to a bell-shaped span ...
The Pentagon said the helicopter, a Sikorsky H-60, took off from Fort Belvoir in Virginia. An official said it was on a training flight and belonged to B Company, 12th Aviation Battalion from Fort ...
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