Lycoming R-680
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Template:Infobox Aircraft Engine
| 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 "ring" for use without cylinder air baffles. R-680 received Approved Type Certificate No. 42 on 4 Feb 1930.
Variants
- R-680
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- R-680B4E
- Rated at Script error: No such module "convert". at 2,100 rpm.[1]
- R-680BA
- Rated at Script error: No such module "convert".
- R-680E3A
- Rated at Script error: No such module "convert". at 2,200 rpm.[1]
- R-680-6
- Rated at Script error: No such module "convert".
- R-680-9
- Rated at Script error: No such module "convert". at 2,200 rpm.
- R-680-13
- Rated at Script error: No such module "convert". at 2,200 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 L-1 Vigilant
- Waco S Series
Specifications (R-680-E3A)
Data from Jane's Fighting Aircraft of World War II.[1]
General characteristics
- Type: Nine cylinder air-cooled radial
- Bore: 4 <templatestyles src="Fraction/styles.css" />5⁄8 in (117 mm)
- Stroke: 4 <templatestyles src="Fraction/styles.css" />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
Comparable engines
Related lists
References
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Notes
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Bibliography
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