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]
| A-3/Model A | |
|---|---|
| |
| Lawrance Model A engine on display at the Aviation Hall of Fame and Museum of New Jersey | |
| Type | Piston aero engine |
| National origin | United States |
| Manufacturer | Lawrance Aero Engine Company |
| Designer | Charles Lawrance |
| First run | c.1916 |
| Produced | c.450 |
Applications
edit- Breese Penguin (flightless ground training aircraft)
- Driggs Dart
- Mummert Cootie
- Shinnecock lightplane
- Swanson SS-3
- Waco Cootie I (monoplane)
- Waco Cootie II (biplane)
Engines on display
edit- A Lawrance A-3 is on public display at the Aerospace Museum of California
Specifications
editData 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) at 1400 rpm
See also
editComparable engines
Related lists
References
edit
Wikimedia Commons has media related to Lawrance A-3.
- Notes
- Bibliography
- Gunston, Bill. World Encyclopaedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
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