The Lawrance A-3 or Lawrance Model A was an American twin-cylinder aircraft piston engine. Designed by
Charles Lawrance
Charles Lanier Lawrance (September 30, 1882 – June 24, 1950) was an American aeronautical engineer and an early proponent of air-cooled aircraft engines.
Early life
Lawrance was born on September 30, 1882 in Lenox, Massachusetts, the son of Fr ...
in the mid-1910s the engine was produced by the
Lawrance Aero Engine Company and under license by
Excelsior. Weighing 200 lb (90 kg) the engine produced 28 horsepower (21 kW).
[Gunston 1989, p. 92.] A feature of this engine was the shared use of a single
crankpin for both cylinders, this caused vibration as the
piston
A piston is a component of reciprocating engines, reciprocating pumps, gas compressors, hydraulic cylinders and pneumatic cylinders, among other similar mechanisms. It is the moving component that is contained by a cylinder and is made gas-t ...
s moved in the same direction.
Applications
*
Breese Penguin (flightless ground training aircraft)
*
Driggs Dart
The Driggs Dart was an American-built light sporting aircraft of the late 1920s.
Development
Ivan Driggs designed the Dart I single-seat high-wing monoplane in 1926. In 1927 he developed the design into the two-seat Dart II, which was a sesquip ...
*
Mummert Cootie Mummert is a German surname. Notable people with the surname include:
* Chuck Mummert, current mayor of Elizabethtown, Pennsylvania
* Werner Mummert
Werner Mummert (31 March 1897 – 28 January 1950) was a general in the German Wehrmacht during ...
*
Shinnecock lightplane
*
Swanson SS-3
*
Waco Cootie I (monoplane)
*
Waco Cootie II
Waco ( ) is the county seat of McLennan County, Texas, United States. It is situated along the Brazos River and I-35, halfway between Dallas and Austin. The city had a 2020 population of 138,486, making it the 22nd-most populous city in the ...
(biplane)
Engines on display
*A Lawrance A-3 is on public display at the
Aerospace Museum of California
Specifications
See also
References
;Notes
;Bibliography
*Gunston, Bill. ''World Encyclopaedia of Aero Engines''. Cambridge, England. Patrick Stephens Limited, 1989.
{{Aeroengine-specs
1910s aircraft piston engines
A-3