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    • Source: 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
      Rated at 210 hp (160 kW) at 2,000 rpm.
      R-680B4E
      Rated at 225 hp (168 kW) at 2,100 rpm.
      R-680BA
      Rated at 240 hp (180 kW)
      R-680E3A
      Rated at 285 hp (213 kW) at 2,200 rpm.
      R-680-6
      Rated at 245 hp (183 kW)
      R-680-9
      Rated at 300 hp (220 kW) at 2,200 rpm.
      R-680-13
      Rated at 300 hp (220 kW) at 2,200 rpm.


      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.


      = 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



      Comparable engines

      Bristol Jupiter
      Continental R-670
      Jacobs R-755
      Pratt & Whitney R-985
      Wright R-790 Whirlwind
      Related lists

      List of aircraft engines


      References




      = Notes

      =


      = Bibliography

      =

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