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)
See also
References
Notes
Bibliography
*
{{US military piston aeroengines
1920s aircraft piston engines
Aircraft air-cooled radial piston engines
R-680