rotary engine, internal-combustion engine whose cycle is similar to that of a piston engine, but which produces rotary motion directly without any conversion from reciprocating motion. A major problem associated with engines of this type is preventing the leakage of combustion gases. The only type of rotary engine currently considered to be of practical value is the Wankel engine (see internal-combustion engine). Although the gas turbine produces rotary motion directly, it is not generally considered a rotary engine because it functions differently.
"rotary engine." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (July 22, 2019). https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/rotary-engine
"rotary engine." The Columbia Encyclopedia, 6th ed.. . Retrieved July 22, 2019 from Encyclopedia.com: https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/rotary-engine
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Wankel rotary engine
"Wankel rotary engine." World Encyclopedia. . Encyclopedia.com. (July 22, 2019). https://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/wankel-rotary-engine
"Wankel rotary engine." World Encyclopedia. . Retrieved July 22, 2019 from Encyclopedia.com: https://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/wankel-rotary-engine