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Jacobs R-830 
Summary
The Jacobs R-830 or L-5 is a seven-cylinder, air-cooled, radial engine for aircraft manufactured in the United States, production started in 1935.[1]
| R-830 | |
|---|---|
| Type | Radial engine |
| Manufacturer | Jacobs Aircraft Engine Company |
| First run | 1935 |
| Developed from | Jacobs R-755 |
| Developed into | Jacobs R-915 |
Design and development edit
The R-830 was effectively an enlargement of the R-755 with strengthened stressed parts. With a bore and stroke of 5.0 in × 5.5 in (140 mm × 127 mm) the displacement was 831 cu in (13.6 L), takeoff power was around 285 hp (212 kW). The engine features steel cylinders with aluminum-alloy cylinder heads.
Applications edit
- Beechcraft Model 18B & S18B Expeditor
- Beechcraft B17B and C17B Staggerwing
- Fleet 50J Freighter (prototype only)
- Fleetwings Sea Bird
- Howard DGA-9
- Spartan 7X Executive (prototype only)
- Waco ZKC-S, ZKS-6 & 7 Standard Cabins
- Waco YOC-1 ZQC-6 ZGC-7 Custom Cabins
- Waco ZVN-8 Custom Cabin
- Waco ZPF-6 and ZPF-7
Specifications (L-5) edit
Data from FAA TCDS[2]
General characteristics
- Type: 7-cylinder air-cooled radial piston engine
- Bore: 5.5 in (140 mm)
- Stroke: 5.0 in (127 mm)
- Displacement: 831 cu in (13.6 L)
- Dry weight: 515 lb (234 kg)
Components
- Valvetrain: 2 valves per cylinder (pushrod-actuated); sodium cooled exhaust valves
- Fuel system: Stromberg NA-R7A carburetor
- Fuel type: 73 octane
- Cooling system: Air-cooled
- Reduction gear: Direct drive, right hand tractor
Performance
- Power output: 285 hp (212 kW) at 2,000 rpm at sea level
- Compression ratio: 6:1
- Power-to-weight ratio: 0.55 hp/lb (0.9 kW/kg)
See also edit
Related development
Comparable engines
Related lists
References edit
Notes edit
Bibliography edit
- Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
External links edit
- The Jacobs Engine - Nanton Lancaster Society