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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]

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
Designed by	Charles Lawrance
First run	c.1916
Produced	c.450

Applications

• 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

• A Lawrance A-3 is on public display at the Aerospace Museum of California

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) at 1400 rpm

See also

Comparable engines

• Aeronca E-107
• Bristol Cherub

Related lists

• List of aircraft engines

References

Wikimedia Commons has media related to Lawrance A-3.

Notes

Bibliography

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На других языках

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[de] Lawrance A-3

Der Lawrance A-3 oder Lawrance Model A war ein Zweizylinderboxermotor für den Antrieb von Flugzeugen des US-amerikanischen Herstellers Lawrance Aero Engine Company. Er wurde Mitte der 1910er Jahre von Charles Lawrance entwickelt und auch von der Excelsior Motor Manufacturing & Supply Company in Lizenz gebaut. Mit einem Gewicht von 200 lb (91 kg) entwickelte der Motor eine Leistung von 28 PS (21 kW).[1] Eine Besonderheit der Maschine war der von beiden Zylindern gemeinsam genutzte Kurbelzapfen, der zu unerwünschten Vibrationen führte, da sich die Kolben immer in die jeweils gleiche Richtung bewegten.[1]

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- [en] Lawrance A-3

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