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Keywords: Kruger flapClose
Journal: Journal of Experimental Biology
J Exp Biol (2007) 210 (23): 4136–4149.
Published: 1 December 2007
... of the underwing coverts closely phased with alula protraction and the end of the downstroke. We propose that the underwing coverts operate as an automatic high-lift device, analogous to a Kruger flap. We suggest that the alula operates as a strake, promoting formation of a leading-edge vortex on the swept hand...
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