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Radial engine in a biplane. 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" in some other languages.
The Lycoming R-680 is a nine-cylinder air-cooled radial engine, the first aero engine produced by Lycoming. The engine was produced in two types, the E and B series; both are essentially the same. The B4E was available in a trainer version with a front exhaust collector "ring" for use without cylinder air baffles.
In Italy Alfa Romeo Avio built both the Jupiter (126-RC35) and the Pegasus under licence, with the engine based on the Pegasus designated as the Alfa Romeo 126-RC34 with the civil version as the 126-RC10. [2] In Czechoslovakia it was built by Walter Engines and was known as the Pegas. [3] Approximately 32,000 Pegasus engines were built. [1]
Radial engines have cylinders mounted radially around a central crankcase. Rotary engines have a similar configuration, except that the crankshaft is fixed and the cylinders rotate around it. (This is different from the Wankel engine configuration described below.) Radial and rotary engine designs were widely used in early aircraft engines.
For example: the -18W was a "C" series engine, built from 1945, whereas the -21 was a "B" series engine, built from 1943. Until 1940 the armed forces adhered strictly to the convention that engines built for the Army Air Forces used engine model numbers with odd numeric suffixes (e.g.: -5), while those built for the US Navy used even (e.g.: -8).
A revised structure and capability to have engines from 180 to 350 hp (134 to 261 kW) fitted. [6] Skybolt (R) A radial engined derivative, with revised fuselage plus the improved structure of the (D), fitted with either a 360 hp (268 kW) Vedeneyev M14P or a 400 hp (298 kW) Vedeneyev M14PF nine-cylinder radial. [6] Skybolt 300
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G-73 Mallard at the Air Zoo. Building on the success of the Goose and Widgeon, Grumman Aircraft developed larger G-73 Mallard for commercial use.Retaining many of the features of the smaller aircraft, such as twin radial engines, high wings with underwing floats, retractable landing gear and a large straight tail, the company built 59 Mallards between 1946 and 1951.