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Wikipedia definition
1. Gurney flapThe Gurney Flap (or wickerbill) is a small flat 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, and projects 1% to 2% of the wing chord. This trailing edge device can improve the performance of a simple airfoil to nearly the same level as a complex high-performance design.
Read “Gurney flap” on English Wikipedia
Read “ガーニーフラップ” on Japanese Wikipedia
Read “Gurney flap” on DBpedia

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