Lycoming R-680

R-680
Lycoming R-680
TypePiston aero-engine
National originUnited States
ManufacturerLycoming Engines
First run1929
Major applications
Manufactured1930–1945
Number built26,000+

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. The R-680 received Approved Type Certificate No. 42 on 4 Feb 1930.[failed verification – see discussion]

History

The engine was granted an approved type certificate by late February 1930. It was shortly thereafter exhibited at the International Aircraft Exposition in St. Louis and placed in production.

Variants

R-680
Rated at 210 hp (160 kW) at 2,000 rpm.
R-680-B4D
225 hp (168 kW) at 2,100 rpm.
R-680-B4E
Rated at 225 hp (168 kW) at 2,100 rpm.
R-680-BA
Rated at 240 hp (180 kW)
R-680-E3A
Rated at 285 hp (213 kW) at 2,200 rpm.
R-680-E3B
Rated at 285 hp (213 kW) at 2,200 rpm.
R-680-5
Military version of R-680-B4B.
R-680-6
Rated at 245 hp (183 kW)
R-680-7
Military version of R-680-B4C.
R-680-8
Military version of R-680-B4D.
R-680-9
Rated at 300 hp (220 kW) at 2,200 rpm.
R-680-11
Military version of R-680-B4D.
R-680-13
Rated at 300 hp (220 kW) at 2,200 rpm.
R-680-17
Military version of R-680-B4E.

Applications

Specifications (R-680-E3A)

Data from Jane's Fighting Aircraft of World War II.

General characteristics

Components

Performance

See also

Comparable engines

Related lists

References

Notes

  1. ↑ "Lycoming R-680-BA, Radial 9 Engine". National Air and Space Museum. Smithsonian Institution. Retrieved 8 October 2026.
  2. ↑ "Type Certificate Data Sheet ATC 42". Federal Aviation Administration. U.S. Department of Transportation. Retrieved 8 October 2026.
  3. ↑ "Approve Plane, Engine, Pontoons". Aviation. Vol. 28, no. 8. McGraw-Hill Publishing Company. 22 February 1930. p. 396. Retrieved 8 October 2026.
  4. ↑ "Engines and Accessories at the St. Louis Show". Aviation. Vol. 28, no. 10. McGraw-Hill Publishing Company. 8 March 1930. pp. 470–481. Retrieved 8 October 2026.
  5. ↑ Neville, Leslie E. (1 March 1930). "Airplanes at the Show". Aviation. Vol. 28, no. 9. McGraw-Hill Publishing Company. pp. 419–433. Retrieved 8 October 2026.
  6. 1 2 3 Wilkinson, Paul H. (1945). Aircraft Engines of the World, 1945 (Revised ed.). New York: Paul H. Wilkinson. p. 121. Retrieved 13 October 2026.
  7. 1 2 3 Bridgman 1988
  8. 1 2 3 4 5 Aircraft Engine Listing. Washington, D.C.: Civil Aeronautics Administration, U.S. Department of Commerce. 15 May 1950. pp. 5–6. Retrieved 13 October 2026.

Bibliography

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