The Lycoming R-680 is a nine-cylinder air-cooled

radial Radial is a geometric term of location which may refer to: Mathematics and Direction * Vector (geometric) In mathematics, physics, and engineering, a Euclidean vector or simply a vector (sometimes called a geometric vector or spatial vector) ...

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-680B4E :Rated at at 2100 rpm.Bridgman 1988 ;R-680BA :Rated at ;R-680E3A :Rated at at 2200 rpm. ;R-680-6 :Rated at ;R-680-13 :Rated at at 2200 rpm.

Applications

* Beech AT-10 Wichita * Boeing-Stearman PT-13 * Cessna AT-8/AT-17 *

Curtiss-Wright AT-9 The Curtiss-Wright AT-9 Jeep was a twin-engined advanced trainer aircraft used by the United States during World War II to bridge the gap between single-engined trainers and twin-engined combat aircraft. The AT-9 had a low-wing cantilever monopl ...

Fleetwings BQ-2 The Fleetwings BQ-2 was an early expendable unmanned aerial vehicle — referred to at the time as an " assault drone" — developed by Fleetwings during the Second World War for use by the United States Army Air Forces. Only a single example of ...

* Spartan NP-1 *

Stinson Airliner The Stinson SM-6000 Airliner was a 1930s three-engined (trimotor) ten-passenger airliner designed and built by the Stinson Aircraft Corporation. The SM-6000 was a high-wing braced monoplane with room for a pilot and a cabin for ten passengers. I ...

Stinson Reliant The Stinson Reliant is a popular single-engine four- to five-seat high-wing monoplane manufactured by the Stinson Aircraft Division of the Aviation Manufacturing Corporation of Wayne, Michigan. Design and development The Reliant is a high-win ...

* Stinson Vigilant *

Waco S Series The Waco S Series is a family of American cabin biplanes produced by the Waco Aircraft Company starting in 1935. Development and designations The Waco closed cabin biplanes, initially known as the C (for Cabin) series were all unequal span, stag ...

Specifications (R-680-E3A)

References

Notes

Bibliography