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Lawrance A-3 / Model A

Lawrance Model A


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 and under license by Excelsior. Weighing 200 lb (90 kg) the engine produced 28 horsepower (21 kW). A feature of this engine was the shared use of a single crankpin for both cylinders, this caused vibration as the pistons moved in the same direction.

First run circa 1916, around 450 were built.


Breese Penguin (flightless ground training aircraft)
Driggs Dart
Waco Cootie
Shinnecock lightplane


Type: Two-cylinder, air-cooled horizontally opposed piston aircraft engine
Dry weight: 200 lb (91 kg)
Cooling system: Air-cooled
Power output: 28 hp (21 kW)



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