Lawrance A-3

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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).^[1] 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.^[1]

Applications

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

Specifications

Data from Gunston.^[1]

General characteristics

Type: Two-cylinder, air-cooled horizontally opposed piston aircraft engine
Dry weight: 200 lb (91 kg)

Components

Cooling system: Air-cooled

Performance

Power output: 28 hp (21 kW)

References

Wikimedia Commons has media related to Lawrance A-3.

Notes

↑ 1.0 1.1 1.2 Gunston 1989, p. 92.

Bibliography

Gunston, Bill. World Encyclopaedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9

Wright Aeronautical and Lawrance Aero Engine Company aircraft engines

Wright inline engines

E
Gypsy
T-1
T-2
T-3 (V-1950)
T-4
V-720
IV-1460
IV-1560

Lawrance radials

Wright radials

Whirlwind	R-540 R-760 R-790 R-975 R-1510 R-1670

Cyclone	R-1300 R-1820 R-2600 R-3350 R-4090

Others	Gale R-1200 R-2160

Wright turbojets

Wright turboprops/turboshafts

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