A Preliminary Investigation of Supercharging an Air-Cooled Engine in Flight
A 1929 technical report on supercharging an air-cooled aircraft engine in flight, issued by the NASA Technical Reports Server collection for engineers and aviation researchers. The single picture is a photograph of an engine cylinder head viewed face-on, with spark plug and valve bosses, cooling fins at the rim, and a caption about the location of holes. A designer might take from it a plain, raw machined-metal look, with cast surfaces, cooling fin edges and bolt-hole forms that suit industrial or mechanical themes.
