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 at 2,000 rpm.
;R-680B4E
:Rated at at 2,100 rpm.
[Bridgman 1988]
;R-680BA
:Rated at
;R-680E3A
:Rated at at 2,200 rpm.
;R-680-6
:Rated at
;R-680-9
:Rated at at 2,200 rpm.
;R-680-13
:Rated at at 2,200 rpm.
Applications
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Beech AT-10 Wichita
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Boeing-Stearman PT-13
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Cessna AT-8/AT-17
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Curtiss-Wright AT-9
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Fleetwings BQ-2
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Spartan NP-1
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Stinson Airliner
The Stinson SM-6000 Airliner was a 1930s three-engined (trimotor) ten-passenger airliner designed and built by the Stinson Aircraft Company, Stinson Aircraft Corporation. The SM-6000 was a high-wing braced monoplane with room for a pilot and a ca ...
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Stinson Reliant
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Stinson L-1 Vigilant
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Waco S Series
Specifications (R-680-E3A)
See also
References
Notes
Bibliography
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{{US military piston aeroengines
1920s aircraft piston engines
Aircraft air-cooled radial piston engines
R-680