The Lawrance A-3 or Lawrance Model A was an American twin-cylinder aircraft piston engine. Designed by
Charles Lawrance in the mid-1910s the engine was produced by the
Lawrance Aero Engine Company
Lawrance Aero Engine Company was an American aircraft engine manufacturer. Founded by engine pioneer Charles Lawrance, it designed one of the first successful air-cooled radial engines. It existed for only 5 years, being acquired by Wright Aeronau ...
and under license by
Excelsior
Excelsior, a Latin comparative word often translated as "ever upward" or "even higher", may refer to:
Arts and entertainment Literature and poetry
* "Excelsior" (Longfellow), an 1841 poem by Henry Wadsworth Longfellow
* ''Excelsior'' (Macedo ...
. 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
A crankpin or crank pin, also known as a rod bearing journal, is a mechanical device in an engine which connects the crankshaft to the connecting rod for each cylinder. It has a cylindrical surface, to allow the crankpin to rotate relative to the ...
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-tig ...
s moved in the same direction.
Applications
*
Breese Penguin Breese may refer to:
People
* Breese (surname)
Places
* Breese, Germany
* Breese, Illinois
Breese is a city in Clinton County, Illinois, United States. Breese is the most populous city completely within Clinton County. As of the 2020 census ...
(flightless ground training aircraft)
*
Driggs Dart
*
Mummert Cootie
*
Shinnecock lightplane Shinnecock may refer to:
* Shinnecock Indian Nation, a federally-recognized American Indian tribe in the Town of Southampton, New York
* Shinnecock Reservation, the tribe's reservation
* Mohegan-Pequot language or Shinnecock language, an extinct A ...
*
Swanson SS-3
Swanson is a brand of TV dinners, broths, and canned poultry made for the North American and Hong Kong markets. The former "Swanson Company" was founded in Omaha, Nebraska, where it developed improvements of the frozen dinner. The TV dinner ...
*
Waco Cootie I
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 st ...
(monoplane)
*
Waco Cootie II (biplane)
Engines on display
*A Lawrance A-3 is on public display at the
Aerospace Museum of California
The Aerospace Museum of California is a private non-profit aviation museum located in North Highlands, California, outside of Sacramento, California, on the grounds of the former McClellan Air Force Base. The museum has a 4.5-acre outdoor Air Park ...
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