The Jacobs R-755 (company designation L-4) is a seven-cylinder, air-cooled, radial engine for aircraft manufactured in the United States by the Jacobs Aircraft Engine Company. == Design and development == The R-755 was first run in 1933 and was still in production in the 1970s.
The Jacobs R-755 (company designation L-4) is a seven-cylinder, air-cooled, radial engine for aircraft manufactured in the United States by the Jacobs Aircraft Engine Company. == Design and development == The R-755 was first run in 1933 and was still in production in the 1970s.
Source: Wikipedia "Jacobs R-755" · CC BY-SA 4.0
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