Ranger V-770
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The Ranger SVG-770 was an air-cooled inverted Vee aero-engine developed by the Ranger Aircraft Engine Division of the Fairchild Engine & Aircraft Corporation[1].
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[edit] Development & Production
In 1931 the V-770 design was put to paper, based on the Ranger 6-440 series of inline aircooled engines, and test flown in the Vought XSO2U-1 Scout. In 1938 it was tested in the Curtiss SO3C Seamew and found to be unreliable with a tendency to overheat in low speed flight[2][3]. By 1941 a more developed V-770 was installed in the Fairchild XAT-14 Gunner prototype and found satisfactory for the production Fairchild AT-21 Gunner gunnery school aircraft[4].
Produced from 1941-1945, the V-770 featured a two-piece aluminum alloy crankcase, steel barreled cylinders with integral aluminum alloy fins and aluminum alloy heads. The V-770 was one of very few V-type, in-line, air-cooled engines to reach production. The engine was used in a relatively small number of Army Air Forces aircraft, among them the Fairchild AT-21 twin-engine trainer of which approximately 175 were built.[5]
[edit] Variants
- V-770-4
- installed in the Vought XSO2U-1 Scout
- V-770-6
- installed in the XAT-14 Gunner prototype, intended for the Ryan SOR-1 Scout
- V-770-7
- installed in the Bell XP-77 light-weight fighter prototype
- V-770-8
- installed in the Curtiss SO3C Seamew Scout[3]
- V-770-9
- installed in the XAT-6E Texan prototype[4]
- V-770-11
- installed in the Fairchild AT-21 Gunner[4]
- V-770-15
- installed in the Fairchild AT-21 Gunner[4]
- SGV-770C-1
- tested in the Curtiss XF6C-7 Hawk Fighter-Bomber at 350 hp[3]
- SGV-770D-5
- developed for post-war commercial use[1], 700 hp ( kW) at 3,600 RPM, weight 870 lb (395 kg), height 31.11 in (790 mm), length 74.92 in (1,900 mm), width 33.28 in (846 mm)
[edit] General characteristics (SGV-770C-1)
Data from:"Janes Fighting Aircraft of World War II" (Random House Group Ltd. 20 Vauxhall Bridge Road, London SW1V 2SA, 1989, ISBN 1-851-70493-0), 318 pp.
General characteristics
- Type: 12-cylinder inverted Vee piston engine
- Bore: 4 in (101.6 mm)
- Stroke: 5.125 in (120 mm)
- Displacement: 773 in3 (12.6 L)
- Length: 62 in (1,574.8 mm)
- Width: 28 in (711.2 mm)
- Height: 32.2 in (817.88 mm)
- Dry weight: 730 lb (331 kg)
Components
- Valvetrain: two overhead camshafts, one per cylinder bank, gear driven
- Supercharger: Single-Speed, Single-Stage, produces 45 inches of mercury (1,523.875 millibars) at take-off
- Fuel system: Holly non-icing carburettor
- Fuel type: 87 octane petrol
- Oil system: full pressure type
- Cooling system: air-cooled
Performance
- Power output: 520 hp @ 3,000 RPM (387.7 kW)
- Specific power: 0.673 hp/in3
- Compression ratio: 6.5:1
- Power-to-weight ratio: 0.71 HP/lb
Value
- Cost each: $11,000 U.S. Dollars circa 1944
[edit] See also
[edit] References
- ^ a b "Janes Fighting Aircraft of World War II" (Random House Group Ltd. 20 Vauxhall Bridge Road, London SW1V 2SA, 1989, ISBN 1-851-70493-0), 318 pp.
- ^ "A History of Aircraft Piston Engines" by Herschel Smith, (Sunflower University Press Manhattan, Kansas, 1981, ISBN 0-89745-079-5), 255pp.
- ^ a b c "The Complete Encyclopedia of World Aircraft" cover Editors: Paul Eden & Soph Moeng, (Amber Books Ltd. Bradley's Close, 74-77 White Lion Street, London, NI 9PF, 2002, ISBN 0-7607-3432-1), 1152 pp.
- ^ a b c d "United States Military Aircraft Since 1909" by F. G. Swanborough & Peter M. Bowers (Putnam New York, ISBN 085177816X) 1964, 596 pp.
- ^ Museum of the Air Force accessed June 23, 2007
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