The Jacobs R-755 (company designation L-4) was a seven-cylinder, air-cooled, radial engine for aircraft manufactured in the United States by the Jacobs Aircraft Engine Company.[1]
[edit] Design and development
The R-755 was first run in 1933 and was still in production in the 1970s. With a bore and stroke of 5.25 in × 5 in (133 mm × 127 mm) the displacement was 757 cu in (12.4 L), power ranged from 200 hp to 350 hp (150 kW - 260 kW). The engine features steel cylinders with aluminum-alloy cylinder heads. An R-755E variant was developed for use in helicopters.
[edit] Applications
[edit] Engines on display
[edit] Specifications (R-755-A1)
Data from Jane's[3]
General characteristics
- Type: 7-cylinder air-cooled radial piston engine
- Bore: 5.25 in (133 mm)
- Stroke: 5.0 in (127 mm)
- Displacement: 757 cu in (12.4 L)
- Length: 27.25 in (692 mm)
- Diameter: 44 in (1,188 mm)
- Dry weight: 505 lb (229 kg)
Components
- Valvetrain: 2 valves per cylinder, pushrod-actuated, Sodium cooled exhaust valves
- Fuel system: Single Stromberg NA-R7A carburetor
- Fuel type: 73 octane
- Oil system: One pressure pump, two scavenge pumps
- Cooling system: Air-cooled
- Reduction gear: Direct drive, right hand tractor
Performance
[edit] See also
- Comparable engines
- Related lists
[edit] References
[edit] Bibliography
- Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
- Jane's Fighting Aircraft of World War II. London. Studio Editions Ltd, 1989. ISBN 0-517-67964-7
[edit] External links
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