![]() Wind Turbines extract energy from the force of the wind on an aerofoil, in this case a turbine blade. See also details about the magnitude of Aerodynamic Lift and Drag and Missile Ballistics See more about the angle of attack and the theories of aerodynamic lift below. The magnitudes of the lift and drag are dependent on the angle of attack between the direction of the motion of the wing through the air and the chord line of the wing. The drag is dependent on the effective area of the wing facing directly into the airflow as well as the shape of the aerofoil. The lift is accompanied by drag which represents the air resistance against the wing as it forces its way through the air. The result of the movement of the wing through stationary air is a lift force perpendicular to the motion of the wing, which is greater than the downwards gravitational force on the wing and so keeps the aircraft airborne. The thrust driving the wing forward is provided by an external source, in this case by propellers or jet engines. It is thus the turning of the air flow which creates the lift.Īircraft are kept in the air by the forward thrust of the wings or aerofoils, through the air. This means that the force of the aerofoil pushing the air downwards, creating the downwash, is accompanied by an equal and opposite force from the air pushing the aerofoil upwards and hence providing the aerodynamic lift.
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