| 词条 | Wright R-4090 Cyclone 22 | |||||||||||||||
| 释义 |
The R-4090 Cyclone 22 was an experimental radial piston engine designed and built in prototype form in the United States during the 1940s. Design and developmentDuring the 1940s, Wright Aeronautical Corporation was constantly in competition with Pratt & Whitney for new engine designs required for civil and military aircraft. Utilising the Wright R-3350 as a basis, Wright developed a 22-cylinder engine, using R-3350 cylinders arranged as a two-row radial engine with 11 cylinders per row.[1] The air-cooled R-4090 was rated to deliver {{convert|3000|hp|kW|abbr=on}} at 2,800 rpm for take-off, from a total displacement of {{convert|4092|cuin|l|abbr=on}}, with a compression ratio of 6.85:1. Improved performance was expected from the R-4090 if it was proceeded with. A two-speed single-stage supercharger helped maintain rated power to higher altitudes.[1] The core of the engine was a forged steel crankcase which enclosed the three piece two-throw crankshaft. The cylinders were arranged equally around the crankcase, with each row off-set by 16.3636.° to ensure cooling airflow. Accessories similar to other Cyclone engines were arranged around the rear face of the crankcase and a 0.333:1 planetary reduction gearbox at the front.[1] Although there are no records of failings of the R-4090, the engine was abandoned to allow development of the R-3350 Cyclone 18 series.[1] Variants
Specifications (XR-4090-1){{pistonspecs||ref=enginehistory.org,[1] Old Machine Press[2] |type=Air-cooled 22 cylinder two-row radial piston engine |bore={{convert|6.125|in|mm|abbr=on|1}} |stroke={{convert|6.3125|in|mm|abbr=on|1}} |displacement={{convert|4092|cuin|l|abbr=on}} |length={{convert|91|in|mm|abbr=on}} |diameter={{convert|58|in|mm|abbr=on}} |width= |height= |weight={{convert|3230|lb|kg|abbr=on}} |valvetrain=One inlet and one Sodium-cooled exhaust over-head valves per cylinder, driven by pushrods and rocker arms. |supercharger={{convert|14|in|mm|abbr=on}} diameter impeller, single-stage two-speed supercharger; gear ratios: of 5 to 1 and 7 to 1. |turbocharger= |fuelsystem= |fueltype=Gasoline |oilsystem= |coolingsystem= |power={{convert|3000|hp|kW|abbr=on}} at 2,800 rpm for take-off |specpower= |compression=6.85:1 |fuelcon= |specfuelcon= |oilcon= |power/weight= |designer= |reduction_gear=0.333:1 planetary reduction gearbox |general_other= |components_other= |performance_other= }}{{aircontent |see also= |related= |similar aircraft= |lists= }} References1. ^{{cite web|title=Curtiss-Wright XR-4090 A 22-Cylinder Radial|url=http://www.enginehistory.org/Wright/R-4090/Curtiss-WrightR-4090.shtml|website=enginehistory.org|accessdate=24 September 2015}} 2. ^1 2 3 4 5 6 {{cite web|last1=Pearce|first1=William|title=Wright Aeronautical R-4090 Cyclone 22|url=https://oldmachinepress.wordpress.com/2013/03/22/wright-aeronautical-r-4090-cyclone-22/|website=oldmachinepress.wordpress.com|accessdate=24 September 2015|date=22 March 2013}} Bibliography
3 : Wright aircraft engines|Radial engines|Aircraft piston engines 1940–1949 |
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