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| Curtiss V-1570 Conqueror | |
|---|---|
| Name | Curtiss V-1570 Conqueror |
| Caption | Curtiss V-1570 Conqueror inline engine installation |
| Type | Aircraft engine |
| Manufacturer | Curtiss Aeroplane and Motor Company |
| First run | 1926 |
| Status | Discontinued |
Curtiss V-1570 Conqueror The Curtiss V-1570 Conqueror was an American liquid-cooled, V-12 aircraft engine developed in the 1920s by the Curtiss Aeroplane and Motor Company for fighters, bombers, and racing aircraft. It entered service during a period of rapid aviation expansion alongside engines from Rolls-Royce, Packard, Wright Aeronautical, and Hispano-Suiza, and powered types used by the United States Army Air Corps, United States Navy, and several export customers. Development intersected with contemporaneous designs such as the Curtiss D-12, Napier Lion, and Liberty L-12 while influencing later powerplants like the Packard V-1650.
Curtiss initiated the V-1570 program after the success of the Curtiss D-12 and in response to performance demands from the Boeing Airplane Company and Glenn Curtiss-led enterprises supporting the Aviation Section, U.S. Signal Corps. Chief engineers at Curtiss worked with advisors from Smithsonian Institution-affiliated aeronautical researchers and consulted test pilots from Kelly Field and Mitchel Field. The Conqueror incorporated lessons from World War I V-12 engines, the Salmson radial experiments, and the thermodynamic studies published by researchers at Massachusetts Institute of Technology and California Institute of Technology. Early bench testing occurred at Curtiss facilities and at National Advisory Committee for Aeronautics installations, leading to iterative improvements in supercharging and metallurgy influenced by firms such as General Electric and Westinghouse Electric Corporation.
The V-1570 was a 60° V-12, liquid-cooled engine featuring aluminium alloy crankcases and steel cylinder liners, employing high-compression pistons and dual camshafts per bank derived from developments at Baldwin Locomotive Works and Armstrong Siddeley. The Conqueror used single-stage and later two-stage superchargers with intercooling concepts studied at Ames Research Center and incorporated magnesium components similar to those used by Hispano-Suiza and BMW during the interwar period. Fuel delivery evolved from carburetion patterned after Solex systems to early fuel injection trials paralleling Mercedes-Benz experiments. Lubrication systems took cues from Rolls-Royce R and included dry-sump scavenging architectures used in contemporary Sikorsky rotorcraft engines. Cooling jackets and radiator installations mirrored designs trialed on Curtiss P-6 Hawk and Boeing F4B prototypes.
Curtiss produced multiple Conqueror variants designated by internal type numbers and military designations analogous to variant practices at Pratt & Whitney and Allison Engine Company. Notable variants included versions with different supercharger gear ratios for high-altitude work requested by Brigadier General Billy Mitchell advocates, strengthened crankshafts for carrier operations evaluated by United States Navy Test Pilot School personnel, and reduced-diameter versions for racing aircraft entered in National Air Races and transcontinental competitions promoted by Daniel Guggenheim and Orville Wright-sponsored events. Export versions for Royal Canadian Air Force and Imperial Japanese Navy evaluators adjusted cooling and accessory drives to match local installation practices influenced by Handley Page and Nakajima design offices.
The Conqueror saw service with interwar fighter and reconnaissance types procured by the United States Army Air Corps and experimental naval installations on USS Langley-era carriers and auxiliary ships. It powered prototypes competing in procurement contests against engines from Wright Aeronautical, Curtiss-Wright Corporation successors, and Packard Motor Car Company as the USAAC sought high-performance powerplants in the 1920s and early 1930s. Test pilots from Army Air Service units evaluated Conqueror-powered aircraft at air shows alongside types from de Havilland, Fokker, and Gloster. Operational issues with cooling and maintenance cycles paralleled experiences with the Rolls-Royce Kestrel in export service and informed USAAC policy shifts toward air-cooled radials exemplified by later Pratt & Whitney R-1340 and Wright R-1820 adoption.
The V-1570 was installed in a range of Curtiss airframes and experimental platforms developed at facilities associated with Curtiss-Wright and subcontractors including Bell Aircraft Corporation and Seversky Aircraft Corporation. Notable installations included prototypes of the Curtiss P-6 Hawk family, racing specials campaigned by Jimmy Doolittle and contemporaries, and maritime reconnaissance prototypes evaluated by Naval Air Station Pensacola staff. International installations and trials involved Royal Air Force liaison engineers, the Soviet Air Forces evaluation teams, and private firms such as Fairey Aviation Company and Breguet adapting the Conqueror to biplane and monoplane layouts.
Typical V-1570 outputs ranged in the 600–800 horsepower class depending on variant, supercharger configuration, and altitude ratings, comparable to contemporaries like the Rolls-Royce Kestrel and Hispano-Suiza 12Y. Specific power, weight, and thermal efficiency figures varied with production series; engines were bench-tested using instrumentation and protocols from National Bureau of Standards and endurance-run practices established at Langley Research Center. Service ceiling and rate of climb for Conqueror-powered prototypes were published in reports circulated among United States Army Air Corps procurement officers and exhibited in comparative trials with Curtiss OX-5-equipped types.
Production of the Curtiss V-1570 ceased as aviation priorities shifted and Curtiss reorganized into Curtiss-Wright Corporation with changing market demands during the 1930s and consolidation influenced by the Great Depression. Surviving Conqueror engines became study specimens in collections at institutions such as the Smithsonian National Air and Space Museum and technical archives at Hagley Museum and Library. The Conqueror's design contributed to metallurgy, supercharging, and installation practices that informed later engines like the Packard V-1650 Merlin license-built for North American Aviation fighters and indirectly influenced cooling approaches adopted by Grumman and Vought designers. Its operational record and prototype installations remain subjects in historical studies by scholars affiliated with Imperial War Museums, Royal Aeronautical Society, and various university aviation history programs.
Category:Liquid-cooled aircraft piston engines Category:Curtiss aircraft engines