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From this NASA study on LE flap/droop for a light general aviation wing: Variations of lift are small up to $\alpha$ 10°, but the stall is delayed to a higher angle of attack (and $C_L$) for a full-span droop (see: How do droops help to avoid stalls?). And from a NACA study published in 1954 (NACA-RM-SA54B16) on the Effect of a Leading-edge Flap upon the ...

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