skid fin

American  

noun

Aeronautics.

1. an upright projection or fin, positioned from leading edge to trailing edge in the center of the upper wing of some early airplanes and used to retard skidding.

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Etymology

Origin of skid fin

First recorded in 1930–35

Example Sentences

In a turn, the custom-built seats hold her body in place while the skid fin keeps the boat tracking, although like all hydroplane racers with surface props, it turns best going to port.

From Time Magazine Archive