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The R-790 Whirlwind began as the Lawrance J-1, a nine-cylinder air-cooled radial developed in 1921 by the Lawrance Aero Engine Company for the U.S. Navy. The Navy was very enthusiastic about air-cooled engines, which it considered better suited for naval use than liquid-cooled ones. [1]
An important advantage of owning a Menasco engine was Al's appreciation of the economics of using off the shelf interchangeable parts whenever possible. His company was the only supplier of inverted in-line engines in the early thirties in the USA. They had reasonably high power, and a ready availability of complete engines and repair parts. [6]
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 Franklin O-350 (company designation 6A-350) was an American air-cooled aircraft engine of the 1960s. The engine was of six-cylinder, horizontally-opposed layout and displaced 350 cu in (6 L). The power output was 235 hp (175 kW). The 6V-350 was a vertically mounted, fan cooled version for helicopters.
In 1930 Franklin introduced a new type of engine which ultimately produced 100 horsepower (75 kW), with one of the highest power-to-weight ratios of the time. In 1932, in response to competition amongst luxury car makers, Franklin brought out a twelve-cylinder engine. [11] Air cooled with 398 cubic inches (6.5 L), it developed 150 hp (110 kW).
Great Plains Aircraft Supply Company is an American aircraft manufacturer of experimental plans based primarily on the Volkswagen air-cooled engine. Great Plains provides VW engine conversions for use in experimental aircraft. [1] Great Plains has been selling and manufacturing conversions of VW engines since circa 1982.
The project was terminated in 1945, being superseded by the jet engine. [2] A 100-litre 5,000 hp X32 (twin-X16) version of the Exe/Pennine, originally known as the Exe 100, was to have become the Rolls-Royce Snowdon. [3] Rolls-Royce air-cooled engines, intended for commercial transport aeroplane use, were named after British mountains, e.g.
Performance data of the air-cooled two-, three- or four-cylinder engines are available for a power range of 15 to 56 kW at a maximum speed of up to 3000 rpm. The maximum torque of the 4-cylinder version is 219.6 Nm. Due to the air-cooling, the engine may be operated under any climatic conditions and assures high operation reliability.