| 词条 | RAF 4 | ||||||||||||||
| 释义 |
The RAF 4 was a British air-cooled, V12 engine developed for aircraft use during World War I. Based on the eight–cylinder RAF 1 it was designed by the Royal Aircraft Factory but produced by the two British companies of Daimler and Siddeley-Deasy. The RAF 5 was a pusher version of the same engine.[1] TurbochargerIn April 1918 a turbocharged experimental version of the RAF 4d was developed using a Rateau turbocharger, the engine being flown in the R.E.8 B738.[2] Variants
1914 - Prototype engine, 140 horsepower (104 kW).
1917 - Main production variant, 150 horsepower (112 kW). 3,608 built.
1916 - 180 horsepower (134 kW), experimental supercharger installation. 16 built.
1917 - 240 horsepower (180 kW), strengthened cylinders and enlarged valves.
1915 - 150 horsepower (112 kW), pusher version with fan-cooling.
170 horsepower (127 kW), increased bore version of RAF 5. ApplicationsRAF 4
RAF 5
Engines on displayA preserved RAF 4a engine is on public display at the Science Museum (London). Specifications (RAF 4a){{pistonspecs||ref=Lumsden[3] |type=12-cylinder, upright, 60-degree Vee engine |bore=3.94 in (100 mm) |stroke=5.51 in (140 mm) |displacement=806.15 cu in (13.2 L) |length= |diameter= |width= |height= |weight=680 lb (308 kg) |valvetrain=EOI (side-valve inlet, exhaust overhead) |supercharger= |turbocharger= |fuelsystem=Twin Claudel-Hobson Mk.1A carburettors |fueltype= |oilsystem= |coolingsystem=Air-cooled |power=163 hp (122 kW) at 1,800 rpm (takeoff power) |specpower=0.2 hp/cu in (9.2 kW/L) |compression=4.3:1 |fuelcon= |specfuelcon= |oilcon= |power/weight=0.24 hp/lb (0.4 kW/kg) |reduction_gear=0.5:1, Left-hand tractor |general_other= |components_other= |performance_other= }} See also{{aircontent|see also= |related=
|similar aircraft= |lists=
|similar engines=
}} References{{commons category}}Notes1. ^Gunston, 1989, p. 156. 2. ^http://www.theaerodrome.com/forum/aircraft/50719-increasing-charge-3.html 3. ^Lumsden 2003, p. 224. Bibliography{{refbegin}}
1 : Aircraft piston engines 1910–1919 |
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