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ESDU 97009 A

ESDU 97009 A 2003-NOV-01 Wng lft coeffcent ncrement at zero angle of attack due to deployment of tralng-edge splt flaps at low speeds

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ESDU 97009 provides an empirical method for estimating delta C sub L0tw, the increment in lift coefficient at zero angle of attack due to the deployment of full-span or part-span split flaps on wings at low speeds. The increment delta C sub L0tw is derived by using the method of ESDU 94029 to establish the characteristics of a split flap on an aerofoil section that is representative of the wing, taken at mid-span of the flap panel, and applying factors to allow for planform geometry and part-span effects. The method has been found to be accurate to within /-15% for 98% of the data studied.

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