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Ranger V-770


  Ranger-V770

 

The Ranger V-770 was an American air-cooled inverted Vee aero-engine developed by the Ranger Aircraft Engine Division of the Fairchild Engine & Aircraft Corporation and first run in 1931.

In 1931, the V-770 design was put to paper, based on the Ranger 6-440 series of inline air-cooled 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. 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.
 
Produced from 1941 to 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, and in the two Bell XP-77s.

By 1944, the unit cost was US$11,000

 

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.
 
V-770-9
Installed in the XAT-6E Texan prototype.

V-770-11
Installed in the Fairchild AT-21 Gunner.

V-770-15
Installed in the Fairchild AT-21 Gunner.
 
SGV-770C-1
Tested in the Curtiss XF6C-7 Hawk Fighter-Bomber at 350 hp.
 
SGV-770D-5
Developed for post-war commercial use, 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)

 

Applications:
Bell XP-77
Curtiss SO3C
Edo OSE
Fairchild AT-21
Fairchild BQ-3
Ikarus 214D
Vought XSO2U

 

Specifications:

 

SGV-770C-1
Type: 12-cylinder inverted Vee piston engine
Bore: 4 in (101.6 mm)
Stroke: 5 1⁄8 in (130.2 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)
Valvetrain: Two overhead camshafts, one per cylinder bank, gear driven
Supercharger: Single-Speed, Single-Stage, produced 45 inches of mercury (1.5 bar, 7.5 psi) at take-off
Fuel system: Holley non-icing carburetor
Fuel type: 87 octane petrol
Oil system: Full pressure type
Cooling system: Air-cooled
Power output: 520 hp at 3,150 rpm (387.7 kW)
Specific power: 0.673 hp/in3
Compression ratio: 6.5:1
Power-to-weight ratio: 0.71 hp/lb

 

 


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