The Ranger V-770 was an American air-cooled inverted V-12 aircraft engine developed by the Ranger Aircraft Engine Division of the Fairchild Engine & Aircraft Corporation in the early 1930s.

Design and development

In 1931, the V-770 design was built, derived from the Ranger 6-440 series of inverted inline air-cooled engines, and test flown in the

Vought Vought was the name of several related American aerospace firms. These have included, in the past, Lewis and Vought Corporation, Chance Vought, Vought-Sikorsky, LTV Aerospace (part of Ling-Temco-Vought), Vought Aircraft Companies, and Vought Ai ...

XSO2U-1 Scout. In 1938 it was tested in the Curtiss SO3C Seamew but was found to be unreliable with a tendency to overheat in low-speed flight, but would still be the most produced aircraft to have the V-770, with 795 being built. By 1941 a more developed V-770 was installed in the Fairchild XAT-14 Gunner prototype gunnery school aircraft, which went into limited production as the Fairchild AT-21 Gunner, of which 174 were built, not including one radial engine prototype. Produced from 1941 to 1945, the V-770 featured a two-piece aluminum alloy crankcase, steel cylinder barrels with integral

aluminum Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It h ...

alloy fins and aluminum alloy heads. The V-770 was the only American inverted V-12 air-cooled engine to reach production. The engine was used in very few aircraft, among them the short lived

Fairchild AT-21 The Fairchild AT-21 was an American World War II specialized bomber crew trainer, intended to train crews in the use of power gun turrets or a gun on a flexible mount, as well as learn to function as a member of a crew. It had a brief career as ...

twin-engine bomber trainer, and in the two Bell XP-77 light-weight fighter prototypes.

Variants

Ranger V-770 engine installation in Bell XP-77A

;V-770-4: Installed in the

Vought XSO2U-1 The Vought XSO2U was an American observation floatplane developed by Vought-Sikorsky for the United States Navy during the late 1930s. Intended to replace the Curtiss SOC Seagull in service as a scout aboard cruisers, it proved superior to t ...

scout aircraft ;V-770-6: Installed in the

Fairchild XAT-14 Gunner The Fairchild AT-21 was an American World War II specialized bomber crew trainer, intended to train crews in the use of power gun turrets or a gun on a flexible mount, as well as learn to function as a member of a crew. It had a brief career as ...

prototype, intended for the Ryan SOR-1 Scout ;V-770-7: Installed in the Bell XP-77 lightweight fighter prototype ;V-770-8: Installed in the Curtiss SO3C Seamew Scout. ;V-770-9: Installed in the

North American XAT-6E Texan The North American Aviation T-6 Texan is an American single-engined advanced trainer aircraft used to train pilots of the United States Army Air Forces (USAAF), United States Navy, Royal Air Force, Royal Canadian Air Force and other air ...

prototype. ;V-770-11: Installed in the

Gunner. ;V-770-15: Installed in the

Gunner. ;V-770-17: Similar to V-770-8 but with raised hollow propeller shaft for mounting cannon or machine gun. ;GV-770: Geared un-supercharged variants. ;SV-770: Supercharged direct-drive variants. ;SGV-770: Supercharged and geared variants. ;SGV-770C-1: Tested in the

Curtiss XF6C-7 Hawk The Curtiss F6C Hawk was a late 1920s American naval biplane fighter aircraft. It was part of the long line of Curtiss Hawk airplanes built by the Curtiss Aeroplane and Motor Company for the American military. Originally designed for land-based ...

fighter-bomber at . ;SGV-770C-1B: (V-770-11) ;SGV-770C-2A: (V-770-8) ;SGV-770C-B1: Installed in the Ikarus 214 prototype ;SGV-770D-4: (V-770-17) Similar to C-2A but with raised hollow propeller shaft for mounting cannon or machine gun. ;SGV-770D-5: Developed for post-war commercial use, at 3,600 RPM, weight , height , length , width

Applications

* Bell XP-77 * Curtiss SO3C Seamew * Edo OSE * Fairchild F-46 * Fairchild AT-21 Gunner * Fairchild BQ-3 * Ikarus 213/Utva 213 Vihor * Ikarus 214 (prototype) * Vought XSO2U * North American XAT-6E

Engines on display

* One restored engine in storage at the Carolinas Aviation Museum * One survives at Cincinnati State Aviation school * One modified V-770 survives in an art car by Michael LeedsBlown Ranger
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Yankee Air Museum The Yankee Air Museum is an aviation museum located at Willow Run Airport in Van Buren Township, Michigan. The museum has a small fleet of flying aircraft and a collection of static display aircraft outdoors. History The Yankee Air Force Inc. w ...

has a V-770 on display. * One restored engine at the Vintage Flying Museum in Fort Worth.

Specifications (SGV-770C-1)

References