Petrol-electric transmission (UK English) or Gasoline-electric or Gas-electric transmission (US English) is a transmission system for road, rail and marine transport which avoids the need for a gearbox. The petrol engine drives a dynamo which supplies electricity to traction motors which propel the vehicle or boat. The traction motors may be driven directly or, in the case of a submarine, via a rechargeable battery.
Petrol-electric transmission was used in certain niche markets in the early 20th century. For example in the petrol-electric railway locomotives produced in Britain for use on the War Department Light Railways during World War I. In France, the Crochat petrol-electric transmission system was used for standard gauge locomotives (up to 240kW of electrical power).
Advantages and disadvantages
Petrol-electric transmission allows smooth, stepless, acceleration without gear changes. The disadvantages are increased cost and weight.
Example of petrol-electric road vehicles include the Tilling-Stevens bus (UK), the Owen Magnetic touring car (USA) and the Saint-Chamond (tank) (France). The tank used the Crochat-Colardeau system of Henry Crochat and Emmanuel Colardeau. This allowed the left and right traction motors to run at different speeds for steering and is detailed in patent US1416611.
Example of petrol-electric rail vehicles include the Doodlebug (rail car) and the GE 57-ton gas-electric boxcab (USA) and the petrol-electric locomotives built for the War Department Light Railways by Dick, Kerr & Co. and British Westinghouse. In France, the Crochat-Colardeau system of Henri Crochat and Emmanuel Colardeau was used in some petrol-electric railcars.
Crochat petrol electric railcar preserved at Pithiviers
Most submarines which served in World War I were diesel-electric. However, some petrol-electric submarines had been built before the war. Examples include: Plunger-class submarine (USA), A-class submarine (1903) (UK), SM U-1 (Austria-Hungary), Russian submarine Krab (1912).
- Davies, W.J.K. (1967). Light Railways of the First World War. David and Charles. pp. 157–159.
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