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Wright R-760
The Wright R-760 Whirlwind was a series of seven-cylinder air-cooled radial aircraft engines built by the Wright Aeronautical division of Curtiss-Wright. These engines had a displacement of 756 in³ (12.4 L) and power ratings of 225-350 hp (168-261 kW).〔Gunston 1989, p.181.〕
==Design and development==
Wright introduced the J-6 Whirlwind family in 1928 to replace the nine-cylinder R-790 series. The J-6 family included varieties with five, seven, and nine cylinders. The seven-cylinder version was originally known as the J-6 Whirlwind Seven, or J-6-7 for short. The U.S. government designated it as the R-760; Wright later adopted this and dropped the J-6 nomenclature.
Like all the members of the J-6 Whirlwind family, the R-760 had larger cylinders than the R-790. The piston stroke of 5.5 in (14.0 cm) was unchanged, but the cylinder bore was expanded to 5.0 in (12.7 cm) from the R-790's bore of 4.5 in (11.4 cm). While the R-790 was naturally aspirated, the R-760, like the other J-6 engines, had a gear-driven supercharger to boost its power output.
Over time, Wright refined the R-760, using suffix letters to indicate successive versions. The original R-760 (or J-6-7) was rated for 225 hp (168 kW),〔Curtiss-Wright (1940), p. 11〕 while the R-760E of 1931 could do 250 hp (186 kW) thanks to an improved cylinder head design.〔Curtiss-Wright (1983), p. 1〕〔Curtiss-Wright (1940), p. 13〕〔FAA Type Certificate Data Sheet ATC 26〕 Wright later added another suffix to show different power levels. The R-760E-1, introduced the same year as the R-760E, had a takeoff power rating of 300 hp (224 kW) thanks to higher-compression pistons and a greater RPM limit.〔〔Curtiss-Wright (1940), p. 14〕〔FAA Type Certificate Data Sheet TC 94〕 The even more powerful R-760E-2 of 1935 could reach 350 hp (261 kW) for takeoff due to increased supercharging and an even higher RPM limit.〔〔Curtiss-Wright (1940), p. 17〕〔FAA Type Certificate Data Sheet TC 155〕 On the other hand, the R-760E-T, designed for trainer aircraft, had the R-760E-1's high-compression pistons, but the supercharger was removed, thus giving just 235 hp (175 kW).〔〔Curtiss-Wright (1940), p. 16〕〔FAA Type Certificate Data Sheet TC 126〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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