Pratt & Whitney R-1830 Twin Wasp
A highly reliable 14-cylinder radial that became one of the most important airliner and military engines of the 1930s and 1940s. It powered legendary transports and bombers while proving that large radial engines could deliver both endurance and efficiency. With over 170,000 units built, it remains one of the most produced aircraft piston engines in history.
Key Specifications
Type
Year Built
14-cylinder, air-cooled radial piston engine
1932
Horsepower
800–1,200 hp at ~2,400–2,700 rpm
Weight
~1,350 lb (612 kg)
Power-to-Weight Ratio
~0.75 hp/lb (varies by model)
Fuel
Aviation gasoline
Cooling System
Ignition
Construction
Manufactuer
Air-cooled with finned cylinders
Dual magneto ignition system
Two-row radial layout, forged steel crankshaft, aluminum alloy crankcase, steel cylinder barrels with aluminum cooling fins
Pratt & Whitney Aircraft
Engineering Significance
•The R-1830 powered the golden age of piston airliners. On the Douglas DC-3, it enabled reliable, profitable passenger service across continents. Its strong fuel efficiency and durability also made it a mainstay of long-range military patrol and transport aircraft during World War II.
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•The Twin Wasp demonstrated how a two-row radial could scale power without sacrificing reliability. Its supercharging systems allowed aircraft to cruise at higher altitudes where air was thinner and weather smoother. By combining durability, efficiency, and mass production, the R-1830 helped standardize long-distance commercial air travel before the jet era.
Notable Aircrafts
•Douglas DC-3
•Consolidated B-24 Liberator
•PBY Catalina
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B-24 Liberator
