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.

R-680
Lycoming R-680
Type Piston aero-engine
National origin United States
Manufacturer Lycoming Engines
First run 1929
Major applications Beechcraft AT-10 Wichita
Stinson Reliant
Curtiss-Wright AT-9
Stinson Airliner
Produced 1930-1945 out of production
Number built over 26.000

Variants
R-680B4E
Rated at 225 hp (168 kW) at 2100 rpm.[1]
R-680BA
Rated at 240 hp (180 kW)
R-680E3A
Rated at 285 hp (213 kW) at 2200 rpm.[1]
R-680-6
Rated at 245 hp (183 kW)
R-680-13
Rated at 300 hp (220 kW) at 2200 rpm.[1]

Applications

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 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

See also

Comparable engines

Related lists

References
Wikimedia Commons has media related to Lycoming R-680.

Notes
  1. Bridgman 1988

Bibliography
  • Bridgman, Leonard (1988). Jane's Fighting Aircraft of World War II. New York: Crescent Books. ISBN 0-517-67964-7.
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