induced drag

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induced drag

n
(Aeronautics) the former name for trailing vortex drag
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But when a flat surface, say, a runway, is beneath the wing, that downwash is deflected, and lift-induced drag is reduced.
The total drag on a helicopter is the sum of the parasitic, frictional and lift-induced drag.
Sharklets similarly reduce lift-induced drag and improve the aerodynamics at the wingtips.