Flight tests of N.A.C.A. nose-slot cowlings on the BFC-1 airplane

Stickle, George W
naca-tn-720
August 1939


The results of flight tests of four nose-slot cowling designs with several variations in each design are presented. The tests were made in the process of developing the nose-slot cowling. The results demonstrate that a nose-slot cowling may be successfully applied to an airplane and that it utilizes the increased slipstream velocity of low-speed operation to produce increased cooling pressure across the engine. A sample design calculation using results from wind-tunnel, flight, and ground tests is given in an appendix to illustrate the design procedure.

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http://naca.central.cranfield.ac.uk/reports/1939/naca-tn-720.pdf