zap flap
noun
\ˈzap-\
Definition of zap flap
: a split flap in which the hinge axis moves aft as the flap is deflected, thus increasing the area of the wing as well as its camber
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Origin and Etymology of zap flap
Zap, shortened from Edward F. Zaparka †1959 (or earlier), American aeronautical engineer who patented it
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