“Jacobs Aircraft Engine Company”的意思、由来-开放百科全书

词条

Jacobs Aircraft Engine Company

释义

Early engines
Later models
Applications
Products
References

The Jacobs Aircraft Engine Company was formed in 1929 in Philadelphia. Later the company moved to Pottstown, Pennsylvania^[1] after purchasing the machine workshop of the Light Manufacturing and Foundry Company.

Early engines

An early product was the 1931 L-3, a {{convert|190.4|cid|cc|abbr=on}} {{convert|51|hp|abbr=on|lk=on}} three-cylinder air-cooled radial engine. Only 44 were built.

By 1933, Jacobs had developed its most famous engine, the L-4 seven-cylinder air-cooled radial, with a power rating of {{convert|225|hp|abbr=on}} displacement of {{convert|757.7|cid|cc|abbr=on}}. It was better known as by its military designation, R-755.^[2] At the time it became known as the best producer of engines in the 200-400 horsepower range. Jacobs was the first to start making engines using forged aluminum alloy pistons, sodium-filled exhaust valves, and magnesium alloy crankcases.

The L-4 was used mostly on the Cessna Bobcat, Cessna 195, and Stearman Kaydet.

Due to the tendency of the L-4 engine to vibrate heavily at low rpm, it was given the nicknames Shakin' Jake and Shakey Jake.^[3]

Later models

Later developments included the 285 hp L-5 or R-830, and 330 hp L-6 or R-915.

Applications

Jacobs engines were fitted to many US-built aircraft of the inter-war period, including several Waco models. They were in use in 26 different countries including in Canada, where 330 horsepower L6-MB engines were used to power the Royal Canadian Air Force's Avro Anson Mk. II aircraft.^[4]

In 1941 the American War Department gave the contract to Jacobs to produce Pratt & Whitney R-985 and R-1340 engines until 1945.^[4] Jacobs ranked 87th among United States corporations in the value of World War II military production contracts.^[5]

After World War II, Jacobs became a division of Republic Industries (not Republic Aircraft).

Products

Jacobs LA-1
Jacobs LA-2
Jacobs L-3 (4{{frac|1|8}}" x 4{{frac|3|4}}")
Jacobs L-4 (R-755) (5{{frac|1|4}}" x 5")
Jacobs L-5 (R-830) (5{{frac|1|2}}" x 5")
Jacobs L-6 (R-915) (5{{frac|1|2}}" x 5{{frac|1|2}}")

References

1. ^{{cite web|title=Occidental Chemical Corp|url=http://www.epa.gov/reg3hwmd/npl/PAD980229298.htm|publisher=E.P.A|accessdate=2 November 2012}}
2. ^{{cite web|title=Jacobs Aircraft Engine Company aircraft engine specifications|url=http://www.pilotfriend.com/aero_engines/engine_specs/jacobs.htm|publisher=www.pilotfriend.com|accessdate=2 November 2012}}
3. ^{{cite web|title=The Jacobs Radial Engine|url=http://www.gruner.com/flight/appendix/classic/jacobs.htm|publisher=www.gruner.com|accessdate=2 November 2012}}
4. ^¹{{cite web|last=Hoult|first=Doug|title=The Jacobs Engine|url=http://www.bombercommandmuseum.ca/s,jacobsengine.html|publisher=www.bombercommandmuseum.ca|accessdate=2 November 2012}}
5. ^Peck, Merton J. & Scherer, Frederic M. The Weapons Acquisition Process: An Economic Analysis (1962) Harvard Business School p.619

4 : Manufacturing companies established in 1929|Manufacturing companies based in Philadelphia|Defunct aircraft engine manufacturers of the United States|1929 establishments in Pennsylvania

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