Brakes. DFS dive-control brakes for gliders and airplanes [with list of references], by Hans Jacobs and Adolf Wanner, [from] Jahrbuch 1938 der deutschen Luftfahrtforschung Luftwissen, v. 4, no. 7, July 1937; and Analytical study of drag of DFS dive-control brake, by Adolf Wanner; [translation by J. Vanier from] Luftwissen, v. 6, no. 5, May 1939.

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