IT seems rather strange that while the general property of wing flaps of putting up both the lift and the drag of a wing at the same time has been known for many years, so little practical application of this result has been made until quite recently.
Irving, H.B. (1935), "Wing Brake Flaps: A Review of their Properties and the Means for their Operation", Aircraft Engineering and Aerospace Technology, Vol. 7 No. 8, pp. 189-198. https://doi.org/10.1108/eb029955
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