dihedral effect

The stabilizing effect of dihedral in the sideslip. When an aircraft sideslips, one wing is forced down, creating a difference between the upper and the lower wings’ angles of attack, with the greatest angle of attack on the lower wing. The increased angle produces increased lift on the lower wing, with a tendency to return the airplane to wings-level flight.
Dihedral effect.

Aviation dictionary. 2014.

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