Principles Of Flight Practice Test

The air and vortices roll off the back of the wing at which angle, contributing to drag, and is known as what?

Downwash Upwash Sidewash Crosswash

Correct Answer:

Downwash

Explanation:

The air is deflected downward as it flows over and off the wing, producing trailing vortices. The angle of this downward deflection relative to the original flight path is called the downwash angle. This downward deflection tilts the lift vector backward, creating a backward component of force that we recognize as induced drag. So, the air and vortices roll off the back of the wing at a downward angle, known as downwash. Upwash, sidewash, and crosswash describe other directions of deflection that don’t apply here.

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