wing drop

wing drop

[′wiŋ ‚dräp]
(aerospace engineering)
A phenomenon experienced by an air vehicle during maneuvers at moderate to high angles of attack, in which an abrupt reduction of lift from one side of the vehicle prior to the other side creates a rolling moment, which causes loss of control of the airplane's roll attitude.

wing drop

A tendency of an aircraft to roll to one of its sides (wind dropping to that side) when the aircraft approaches the stalling angle. This should not be confused with the term wing heavy, which is the tendency of a wing to drop at normal operating speeds.
References in periodicals archive ?
The aircraft experienced a sharp right wing drop, followed by a hard swerve to the right.
Lockheed Martin is developing a spoiler for F-35C Joint Strike Fighter flight test aircraft to counter potential wing drop in transonic turns.
There was a slight amount of right wing drop during power-on stalls (it was a gusty day when we flew the aircraft), but recovery was quick and easy by getting the nose down and neutralizing the controls.
The SAM exhibited no bad habits in a stall, with a noticeable buffeting followed by a drop of the nose, and no wing drop.
In essence, his article is about countering a wing drop if it occurs at the point of stall.
During the landing rollout, both pilots felt the right wing drop and heard a noise like "a blown tire.
He observed the left wing drop down and the airplane impacted the ground.
While in the stall, though, if you add some crossed controls you could see a wing drop dramatically and begin to enter a spin.
That means the pressure of the fast-moving air above the wing drops while the pressure beloe remains higher.
When one wing drops, the force vector of the lowered wing becomes "more" vertical, since the wing is now flying parallel to the ground, and the vertical lift component of lift of the raised wing becomes reduced, resulting in a moment about the longitudinal axis.
The maximum-lift wing pushes while the stalled wing drops, and the airplane rolls (or violently snaps: over into a spin.