Jacobs R-755
| R-755 / L-4 | |
|---|---|
 |
|
| Jacobs R-755 installed in a Boeing-Stearman Model 75 | |
| Type | Radial engine |
| Manufacturer | Jacobs Aircraft Engine Company |
| First run | 1933 |
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]
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.
Engines on display
- A preserved Jacobs R-755 is on display at the Arkansas Air Museum.[2]
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
- Power output: 245 hp (183 kW) at 2,200 RPM at sea level
- Specific power: 0.32 hp/cu-in (14.8 kW/L)
- Power-to-weight ratio: 0.48 hp/lb (0.8 kW/kg)
See also
↑Jump back a sectionReferences
Notes
- ^ Gunston 1989, p.85.
- ^ Arkansas Air Museum - Jacobs R-755 Retrieved: 31 January 2009
- ^ Janes 1989, p.305.
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
External links
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Wikimedia Commons has media related to: Jacobs R-755 |
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