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R-680
Lycoming R-680-BA 1.jpg
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.

VariantsEdit

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]

ApplicationsEdit

Specifications (R-680-E3A)Edit

Data from Jane's.[1]

General characteristics

  • Type: Nine cylinder air-cooled radial
  • Bore: 4 58 in (117 mm)
  • Stroke: 4 12 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 alsoEdit

ReferencesEdit

NotesEdit

  1. 1.0 1.1 1.2 1.3 Bridgeman 1988

BibliographyEdit

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