Lycoming R-680

The topic of Lycoming R-680 has been the subject of interest and debate for a long time. From its origins to the present day, Lycoming R-680 has played a significant role in various aspects of society. In order to better understand this topic, it is essential to delve into its history, its implications and its impact in different contexts. In this article, different perspectives on Lycoming R-680 will be addressed, with the purpose of offering a comprehensive vision that allows readers to acquire a more complete and enriching understanding of this topic.

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

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.[1]
R-680BA
Rated at 240 hp (180 kW)
R-680E3A
Rated at 285 hp (213 kW) at 2,200 rpm.[1]
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.[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. ^ a b c d Bridgman 1988

Bibliography

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