AKA Gurney flap
Quote:
https://en.wikipedia.org › wiki › Gurney_flap
Gurney flap - Wikipedia
Gurney flap A Gurney flap shown on the underside of a Newman airfoil (from NASA Technical Memorandum 4071). The Gurney flap (or wickerbill) is a small tab projecting from the trailing edge of a wing. Typically it is set at a right angle to the pressure-side surface of the airfoil [1] and projects 1% to 2% of the wing chord. [2]
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