|R-755 / L-4|
|Jacobs R-755 installed in a Boeing-Stearman Model 75|
|Manufacturer||Jacobs Aircraft Engine Company|
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.
Data from Jane's
- 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)
- 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
See also↑Jump back a section
- Gunston 1989, p.85.
- Arkansas Air Museum - Jacobs R-755 Retrieved: 31 January 2009
- Janes 1989, p.305.
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