A reciprocating engine, also often known as a piston engine, is a heat engine (usually, although there are also pneumatic and hydraulic reciprocating engines) that uses one or more reciprocating pistons to convert pressure into a rotating motion. This article describes the common features of all types. The main types are: the internal combustion e...
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http://en.wikipedia.org/wiki/Reciprocating_engine
(from the article `horsepower`) Horsepower at the output shaft of an engine, turbine, or motor is termed brake horsepower or shaft horsepower, depending on what kind of instrument ... ...failure in the machinery was likely to cause severe damage to the engine. In 1894 Charles A. Parsons designed the yacht Turbinia, using a steam ... ...
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http://www.britannica.com/eb/a-z/r/19
[
n] - an internal-combustion engine in which the crankshaft is turned by pistons moving up and down in cylinders
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http://www.webdictionary.co.uk/definition.php?query=reciprocating%20engine
reciprocating engine Another term for a piston engine; that is, an engine that employs one or more pistons to convert pressure into a rotating motion.
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http://www.wordinfo.info/words/index/info/view_unit/4094/
noun an internal-combustion engine in which the crankshaft is turned by pistons moving up and down in cylinders
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https://www.encyclo.co.uk/local/20974
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