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Q:

How can we minimize downwash?

A:

Downwash is the air that is deflected by flowing over an airfoil, whether from a plane's wing or a helicopter blade. One way to reduce drag is to change the wing tip by adding a winglet, reducing wing tip vortices. In a helicopter, flying closer to the ground and decreasing the angle of attack of the rotor airfoils reduces downwash.  

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Categories: Forces of Flight