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Franklin engines powered numerous light planes (owing to their light weight) as well as most early American-built helicopters. Aircooled Motors, the last company to manufacture air-cooled engines under the Franklin name, declared bankruptcy in 1975. Its designs were sold to the Polish government. Engines based on these designs remain in production.
In 1947 Air-cooled Motors was purchased for $1.8 million by the Tucker Car Corporation to produce an engine for the 1948 Tucker Sedan. [3] After the purchase, Tucker cancelled all of the company's aircraft contracts so that its resources could be focused on making automotive engines for the Tucker.
Air-cooled engines rely on the circulation of air directly over heat dissipation fins or hot areas of the engine to cool them in order to keep the engine within operating temperatures. Air-cooled designs are far simpler than their liquid-cooled counterparts, which require a separate radiator , coolant reservoir, piping and pumps.
The Classic used an air-cooled twin-rotor Wankel engine that had been developed by David Garside at BSA's Umberslade Hall research facility. [1] [2] [3] Garside, who had been impressed by the air-cooled single-rotor Fichtel & Sachs engine in the Hercules motorcycle, installed a bought-in F&S engine into a BSA B25 'Starfire' frame as a "proof of concept".
Rotax air-cooled, two-stroke engines began appearing on ultralight aircraft in the early 1980s, with a pair of single-cylinder, 9.5-horsepower Rotax 185s [11] [12] powering the single-seat Lazair ultralight by 1982. [12]
On September 1, 2010, Certified Parts Corporation (CPC) of Janesville, Wisconsin, announced it had entered into an agreement with LCT, (Liquid Combustion Technology) of Travelers Rest, South Carolina, to jointly manufacture air-cooled engines for the outdoor power equipment market. The agreement provided CPC with engineering, manufacturing, and ...
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Its most successful post-war products were a series of air-cooled flat-4 and flat-6 general aviation engines. Most famous among these are the O-320 and O-360 four-cylinder engines, and the O-540 six-cylinder engine. [21] [22] Many light aircraft are powered by versions of these engines, with power ratings in the 100–360 hp (75–270 kW) range.