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Curtiss Conqueror

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Curtiss Conqueror

A V-1570 on display at the National Museum of the United States Air Force.
Type V12 piston engine
Manufacturer Curtiss Aeroplane and Motor Company
First run 1926

The Curtiss V-1570 Conqueror was a 12-cylinder vee liquid-cooled aircraft engine. Representing a more powerful version of the Curtiss D-12, the engine entered production in 1926 and flew in numerous aircraft.[1]

Design and development

Designed in 1924 as a military successor to the Curtiss D-12, initially named the Conqueror it was later given the military designation of V-1570 based on its displacement of 1,570 cubic inches (26 L). The engine featured open ended cylinder liners (advanced technology for the period) and pressurized liquid cooling. Developments including the use of a supercharger gradually increased power output until reliability problems due to overheating and coolant leaks became apparent. Military funding for further development of the Conqueror was cut in 1932, efforts by Curtiss to market the engine for civil airliners failed and the line was dropped from production.


Specifications (V-1570-59)

Data from

General characteristics

  • Type: 12-cylinder liquid-cooled Vee aircraft engine
  • Bore: 5 18 in (130.2mm)
  • Stroke: 6 1132 in (161.1mm)
  • Displacement: 1,570.4 in³ (25.73 L)


  • Cooling system: Liquid-cooled


  • Power output: 675 hp (504 kW) at 2,450 rpm
  • Specific power: 0.43 hp/in³ (19.6 kW/l)

See also

Related development

Comparable engines
Related lists




  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9

External links

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