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Large experimental piston aircraft engine From Wikipedia, the free encyclopedia
The Allison V-3420 was a large experimental piston aircraft engine, designed in 1937 by the American Allison Engine Company.
 | This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (December 2021) |
| V-3420 | |
|---|---|
| |
| Allison V-3420 Engine | |
| Type | Liquid-cooled W-24 piston engine |
| National origin | United States |
| Manufacturer | Allison Engine Company |
| First run | 1937 |
| Major applications | Fisher P-75 Eagle |
| Number built | 150[citation needed] |
| Developed from | Allison V-1710 |
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 resulting V-3420 was essentially a pair of 12-cylinder Allison V-1710 engines mated to a common crankcase with a 30° angle between the inner cylinder banks. The crankshafts of the two V-1710 engines were geared together to drive a common propeller shaft. Most V-3420 parts were interchangeable with those for V-1710-E and -F engines.
The V-3420 had a power-to-weight ratio of 1.6 kW/kg or 1 hp/lb, excellent for its time. It was envisioned as a powerful yet compact engine for several advanced USAAF projects of the day, including the Douglas XB-19, the Boeing XB-39 Superfortress, the Lockheed XP-58 Chain Lightning, and the Fisher P-75 Eagle. As none of these designs saw more than limited production, only about 150 V-3420s were built.[citation needed]
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Data from Aircraft Engines of the World 1946
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