Full-Scale Wind-Tunnel Investigation of Wing-Cooling Ducts Effects of Propeller Slipstream, Special Report
This NACA special report from 1939 records full-scale wind-tunnel tests of wing-cooling ducts and how propeller slipstream affects them, written for aeronautical engineers and researchers. Its pictures are engineering plots of duct outlet velocity against duct width, a wing and duct layout drawing, a velocity-ratio graph for climb and power-off conditions, and a black-and-white photograph of a wing with a duct and propellers in the wind tunnel. A designer might take the clean graph lines, the plain technical drawing style, and the strong contrast of the tunnel photograph.
