The Allison V-3420 was a large experimental piston aircraft engine, designed in 1937 by the American Allison Engine Company. == Design and development == In 1937, at the behest of the United States Army Air Corps, the Allison Engine Company agreed to design and build a large-displacement high-power aircraft engine.
The Allison V-3420 was a large experimental piston aircraft engine, designed in 1937 by the American Allison Engine Company. == Design and development == In 1937, at the behest of the United States Army Air Corps, the Allison Engine Company agreed to design and build a large-displacement high-power aircraft engine.
Source: Wikipedia "Allison V-3420" · CC BY-SA 4.0
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