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The Welch O-2 is a light two-cylinder engine developed for the Welch OW-7M series of aircraft.[1]

O-2
Type	Horizontally Opposed Piston Engine
National origin	United States
Manufacturer	Orin Welch Aircraft Company
Designed by	Orin Moore Welch
First run	1931
Major applications	Welch OW-7M
Number built	7

Specifications (O-2)

General characteristics

• Type: air-cooled 2-cylinder horizontally opposed aircraft piston engine
• Bore: 4.5 in
• Stroke: 4.25 in
• Displacement: 135 in³
• Dry weight: 115 lb

Components

• Oil system: dry sump
• Cooling system: Air-cooled

Performance

• Power output: 41hp at 2,300 rpm
• Compression ratio: 5.2:1

See also

• Aeronca E-113

References

External links

• APM Welch OW-8

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