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The effect of multiple fixed slots and a trailing-edge flap on the lift and drag of a Clark Y airfoilLift and drag tests were made on a Clark Y wing equipped with four fixed slots and a trailing-edge flap in the 5-foot vertical wind tunnel of the National Advisory Committee for Aeronautics. All possible combinations of the four slots were tested with the flap neutral and the most promising combinations were tested with the flap down 45 degrees. Considering both the maximum lift coefficient and the speed-range ratio with the flap neutral no appreciable improvement was found with the use of more than the single leading-edge slot. With the flap down 45 degrees a maximum lift coefficient of 2.60 was obtained but the particular slot combination used had a rather large minimum drag coefficient with the flap neutral. With the flap down 45 degrees the optimum combination, considering both the maximum lift coefficient and the speed-range ratio, was obtained with only the two rearmost slots in use. For this arrangement the maximum lift coefficient was 2.44.
Document ID
19930091501
Document Type
Other
Authors
Weick, Fred E
Shortal, Joseph A
Date Acquired
September 6, 2013
Publication Date
January 1, 1933
Report/Patent Number
NACA-TR-427
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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