The Menasco Pirate series were popular 4-cylinder, air-cooled, in-line, inverted, aero-engines, for use in light general and sport aircraft during the 1930s and 1940s. The Menasco engines were interesting in that they came in both normally aspirated and supercharged forms, with the supercharged models exhibiting superior performance at higher altitudes, with a relatively small increase in dimensions and weight. The supercharged models had the S suffix added to their designation to show supercharging.

Variants

Menasco A-4 Pirate (also listed as Menasco 4A)

90hp

Menasco B-4 Pirate

95hp

Menasco C-4 Pirate (Military designation L-365)

125hp

compression ratio 5.8: 1, dry weight 300lbs

Menasco Pirate C-4S

150hp

Menasco D-4 Pirate

125hp, compression ratio 5.5: 1, dry weight 311lbs

Menasco D-4-87 Super Pirate

compression ratio 6: 1, dry weight 310lbs

Menasco M-50 Pirate

Specifications (Menasco C4S Pirate)

External Links

• TC67.pdf
• www.bombercommandmuseum.ca
• www.aircraft-manuals.com
• www.oldengine.org