| R-680 | |
|---|---|
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| Lycoming R-680 |
The Lycoming R-680 is a nine-cylinder air-cooled radial engine, the first aero engine produced by Lycoming. The engine was produced in two types the E and B series both are essentially the same, the B4E was available in a trainer version with a front exhaust collector for use without cylinder air baffles.
Variants[]
- R-680-B4E
- Rated at 225 hp at 2100 rpm.[1]
- R-680-E3A
- Rated at 285 hp at 2200 rpm.[1]
- R-680-13
- Rated at 300 hp at 2200 rpm.[1]
Applications[]
- Beech AT-10 Wichita
- Boeing-Stearman PT-13
- Cessna AT-8/AT-17
- Curtiss-Wright AT-9
- Fleetwings BQ-2
- Spartan NP-1
- Stinson Airliner
- Stinson Reliant
- Stinson Vigilant
- Waco S Series
Specifications (R-680-E3A)[]
Data from Jane's.[1]
General characteristics
- Type: Nine cylinder air-cooled radial
- Bore: 4 5⁄8 in (117 mm)
- Stroke: 4 1⁄2 in (114 mm)
- Displacement: 680 in³ (11.15 litres)
- Length: 37.5 in (953.1 mm)
- Diameter: 43.5 in (1104 mm)
- Dry weight: 515.46 lb (233.9 kg)
Components
- Valvetrain: One inlet and one exhaust valve per cylinder at 30 degrees.
- Fuel system: single-barrel carburetor
- Fuel type: 87 octane rating gasoline
- Oil system: Full pressure type
- Cooling system: Air-cooled
Performance
- Power output: 330 hp (246 kW) at 2,300 rpm at sea level
- Compression ratio: 7:1
- Power-to-weight ratio: 0.64 hp/lb (1.05 kW/kg)
See also[]
- Bristol Jupiter
- Continental R-670
- Pratt & Whitney R-985
- Jacobs R-755
References[]
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Wikimedia Commons has media related to Lycoming R-680. |
Notes[]
Bibliography[]
- Bridgman, Leonard (1988). Jane's Fighting Aircraft of World War II. New York: Crescent Books. ISBN 0-517-67964-7.
The original article can be found at Lycoming R-680 and the edit history here.