
The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders `radiate` outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is called a `star engine` (German Sternmotor, French moteur en étoile) in some languages. The radial confi...
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http://en.wikipedia.org/wiki/Radial_engine

• An engine, usually an internal-combustion engine of a certain type (the radial type) having several cylinders arranged radially like the spokes of a complete wheel. The semiradial engine has radiating cylinders on only one side of the crank shaft.
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(from the article `flight, history of`) ...engines, aircraft could be streamlined to improve speed but with a trade-off in complexity and weight because of the requisite coolant, coolant ...
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http://www.britannica.com/eb/a-z/r/3

A type of aircraft engine in which the cylinders are arranged in a circular fashion around the crankcase. This provides for more efficient cooling. There are two types of radial engines. The stationary radial remains fixed to the airplane and the rotary engine where the engine and propeller revolve ...
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Radial engine (Machinery) An engine, usually an internal-combustion engine of a certain type (the
radial type ) having several cylinders arranged radially like the spokes of a complete wheel. The
semiradial engine has radiating cylinders on only one side of the crank shaft.
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http://www.encyclo.co.uk/webster/R/3

A reciprocating aircraft engine in which all of the cylinders are arranged radially, or spoke-like, around a small crankcase. Also referred to as round engines.
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http://www.sportpilot.org/learntofly/glossary.html

[
n] - an internal-combustion engine having cylinders arranged radially around a central crankcase
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http://www.webdictionary.co.uk/definition.php?query=radial%20engine

An engine with a number of cylinder arranged in a circle around the crankshaft centre line. A design often used for aircraft engines.1850hp Wright R-2600-29 Cyclone 14-cylinder radial. Note that this is effectively two 7 cylinder radials back to back with the rear bank of cylinders being rotated half the cylinder to cylinder spacing.A model 5 cylin...
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An aero-engine with its cylinders arranged radially around the crankshaft, the cylinders being stationary and the crankshaft revolving.
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https://www.encyclo.co.uk/local/20784
noun an internal-combustion engine having cylinders arranged radially around a central crankcase
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https://www.encyclo.co.uk/local/20974
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