Helicopter Aerodynamics Dissymmetry of lift Dissymmetry of lift is the unequal lift produced by the advancing and retreating halves of a helicopter rotor disc during forward flight. The Cause: Airspeed Differential In a hover, all rotor blades move at the same speed relative to the air, creating uniform lift. However, as the helicopter moves forward: Advancing Blade: Moves in the same direction as the helicopter. Its total airspeed is the sum of the blade's rotational speed and the helicopter’s
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A person bending forward to lift a load “with his back” (Fig. P 8.23a) rather than “with his knees” can be injured by large forces exerted on the muscles and vertebrae. The spine pivots mainly at the fifth lumbar vertebra, with the principal supporting force provided by the erector spinalis muscle in the back. To see the magnitude of the forces involved, and to understand why back problems are common among humans, consider the model shown in Figure P 8.23b of a person bending forward to lift a 2
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