The Effect on Airplane Performance of the Factors That Must Be Considered in Applying Low-Drag Cowling to Radial Engines
This is a 1933 technical report from the National Advisory Committee for Aeronautics, published in the United States for aircraft engineers and researchers, examining how low-drag cowling affects airplane performance with radial engines. Its pictures are black-and-white photographs of a biplane fitted with different cowling types, showing engine nacelles, propellers, and cockpit views, which a designer could use as reference for vintage aviation machinery and engineering documentation.
