ESDU 97011
Wing lift coefficient increment at zero angle of attack due to deployment of plain trailing-edge flaps at low speeds.

Abstract:
ESDU 97011 provides an empirical method for estimating delta C sub L0tw, the increment in lift coefficient at zero angle attack due to the deployment of full-span or part-span plain flaps on wings at low speeds. The increment delta C sub L0tw is derived by using the method of ESDU 94028, but with a modified efficiency factor, to establish the characteristics of a plain flap on an aerofoil section that is representative of the wing. Factors are applied 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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Data Item 97011
ISBN: 978 1 86246 011 9
DOI: 10.1912/ESDU97011a
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