Pressure Distribution Tests on PW-9 Wing Models Showing Effects of Biplane Interference
A 1928 report from the National Advisory Committee for Aeronautics, issued as a technical document by NASA's Technical Reports Server, on pressure distribution measurements over PW-9 wing models in biplane arrangements. The pages pair line graphs of pressure against chord position with photographs of wind tunnel test models and manometer apparatus. A designer could draw on the stark engineering diagrams, the plotted curves of pressure coefficients, and the sculpted airfoil silhouettes with their trailing pressure tap wires.
