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McCulloch O-100-1 drone engine
McCulloch O-100-1 on display at Texas Air Museum - Stinson Chapter
Type	Piston engine horizontally opposed
National origin	United States
Manufacturer	McCulloch Aircraft Corporation McCulloch Motors Corp.
First run	1949
Major applications	Benson B-8M autogyros; Radioplane Model PR-15 (OQ-6) and MQM 33 (Q-19); Model O-15-3 Righter Mfr. Co.
Developed from	McCulloch 4 cylinder Model 4300C (O-90-1) 1945-1952
Developed into	McCulloch 6 cylinder Model 6318 (O-150-2) 1955-1972

The McCulloch O-100-1 is a four cylinder, air cooled four piston drone engine developed by the McCulloch Aircraft Corporation (later to become the McCulloch Motors Corp.) which was founded 1943 in Milwaukee, Wisconsin and later moved to Los Angeles, California. The aircraft corporation was formed McCulloch Engineering Company.

In 1972, the corporation was renamed McCulloch Motors Corp. of Los Angeles and sold to Northrop-Ventura.

Development

The McCulloch line of engines consisted of small 1, 2, 4 and 6 cylinder 2-stroke engines. The first engines were used for industrial motor pumps and chainsaws. In the 1940s, military contract started with a 4 cylinder model 4300 (Military O-88) engine to be used in aeronautical target drones. Later with bigger Horsepower (H.P.) development, the engines had experimental aircraft applications.

Production

Operational History

Variants

Horizontally-Opposed Piston Engines

4-Cylinder

• Model 4300 (Mil O-88)
• Model 4300C
• Model 4318A (Mil O-100-1)
• Model 4318B (mil O-100-2)

6-Cylinder

• Model 6318 (O-150-2)
• Model TC-6150 (O-150-4)

Display

Australia

• Moorabbin Air Museum - Moorabbin Airport, Melbourne Australia

United States

• Wings of History Air Museum - San Martin, California
• Texas Air Museum - Stinson Chapter - San Antonio, Texas
• Combat Air Museum - Topeka Regional Airport at Forbes Field, Topeka, Kansas

Specifications

Engine Name McCulloch O-100-1 (model 4318A) Specifications Manufactured by: McCulloch Motors Corp. Cylinder Configuration opposed (flat) Number of Cylinders 4 Bore (inches) 3.19 Stroke (inches) 3.13 Displacement (cubic inches) 100 Fuel Type gasoline Electrical magneto with single spark ignition Horsepower (max for T.O.) 72 Rated RPM 4,100 Compression Ratio 8:1 Cooling System air-cooled Dry Weight (lb) 77 Note 2-stroke drone engine

Reference

1. "Wings of History Air Museum - McCulloch O-100-1 (model 4318A)"
2. McCutcheon, Kimble D. (21 December 2014). "McCulloch Aircraft Engines". Aircraft Engine Historical Society. Huntsville, AL. Retrieved January 21, 2025.]
3. "Aerospace Engines A to Z - McCulloch"
4. reference needed
6. [https://www.aarg.com.au/mcculloch.html}