Ranger V-770

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"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.] .

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 ["A History of Aircraft Piston Engines" by Herschel Smith, (Sunflower University Press Manhattan, Kansas, 1981, ISBN 0-89745-079-5), 255pp.] "The Complete Encyclopedia of World Aircraft" [http://images.barnesandnoble.com/images/5490000/5496066.gifcover] 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.] . 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"United States Military Aircraft Since 1909" by F. G. Swanborough & Peter M. Bowers (Putnam New York, ISBN 085177816X) 1964, 596 pp.] .

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, [ [http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=853National Museum of the Air Force] accessed June 23, 2007] and in the two Bell XP-77s.

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"The Complete Encyclopedia of World Aircraft" [http://images.barnesandnoble.com/images/5490000/5496066.gifcover] 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.] ;V-770-9: installed in the XAT-6E Texan prototype"United States Military Aircraft Since 1909" by F. G. Swanborough & Peter M. Bowers (Putnam New York, ISBN 085177816X) 1964, 596 pp.] ;V-770-11: installed in the Fairchild AT-21 Gunner"United States Military Aircraft Since 1909" by F. G. Swanborough & Peter M. Bowers (Putnam New York, ISBN 085177816X) 1964, 596 pp.] ;V-770-15: installed in the Fairchild AT-21 Gunner"United States Military Aircraft Since 1909" by F. G. Swanborough & Peter M. Bowers (Putnam New York, ISBN 085177816X) 1964, 596 pp.] ;SGV-770C-1: tested in the Curtiss XF6C-7 Hawk Fighter-Bomber at 350 hp"The Complete Encyclopedia of World Aircraft" [http://images.barnesandnoble.com/images/5490000/5496066.gifcover] 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.] ;SGV-770D-5: developed for post-war commercial use"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.] , 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)

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.}pistonspecs

type= 12-cylinder inverted Vee piston engine
bore= 4 in (101.6 mm)
stroke= 5.125 in (120 mm)
displacement= 773 in³ (12.66 L)
length= 62 in (1,574.8 mm)
diameter=
width= 28 in (711.2 mm)
height= 32.2 in (817.88 mm)
weight= 730 lb (331 kg)
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
turbocharger=
fuelsystem= Holly non-icing carburettor
fueltype= 87 octane petrol
oilsystem= full pressure type
coolingsystem= air-cooled
power= 520 hp @ 3,000 RPM (387.7 kW) (bmep = 177.6psi)
specpower= 0.673 hp/in³
compression= 6.5:1
fuelcon=
specfuelcon=
oilcon=
power/weight= 0.71 HP/lb

Value

• Cost each: {cost|$11,000 U.S. Dollars "circa 1944"}

ee also

*List of aircraft engines

References