THE development of modern aeroplanes designed for high speeds, with their thin, almost symmetrical wing sections, has led inevitably to high landing speeds and small gliding angles with the normal wing arrangement.
Pleines, W. (1935), "Wing Brake Flaps: A General Discussion of the Method of Operation and Efficiency of Various Types of Flaps", Aircraft Engineering and Aerospace Technology, Vol. 7 No. 9, pp. 213-219. https://doi.org/10.1108/eb029963
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