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Wright R-3350 Duplex-Cyclone
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Wright R-3350 Duplex-Cyclone
The Wright R-3350 Duplex-Cyclone is an American twin-row, supercharged, air-cooled, radial aircraft engine with 18 cylinders displacing nearly 3,350 cubic inches (54.9 L). Power ranged from 2,200 to 3,700 hp (1,640 to 2,760 kW), depending on model. Developed before World War II, the R-3350's design required a long time to mature, and was still experiencing problems with reliability when used to power the Boeing B-29 Superfortress.
After the war, the engine had matured sufficiently to be used in many civilian airliners, notably in its turbo-compound forms, and was used in the Lockheed L-1049 Super Constellation airliners into the 1950s. Its main rival was the 4,360 in3 (71.4 L), 4,300 hp (3,200 kW) Pratt & Whitney R-4360 Wasp Major, which first ran some seven years after the Duplex-Cyclone. The engine is commonly used on Hawker Sea Fury and Grumman F8F Bearcat Unlimited Class Racers at the Reno Air Races.
In 1927, Wright Aeronautical introduced its "Cyclone" engine, which powered a number of designs in the 1930s. After merging with Curtiss to become Curtiss-Wright in 1929, an effort was started to design an engine in the 1,000 hp (750 kW) class. The new Wright R-1820 Cyclone 9 first ran in 1935, and became one of the most used aircraft engines in the late 1930s and early 1940's, powering the Boeing B-17 Flying Fortress heavy bomber, General Motors FM-2 Wildcat fighter and Douglas SBD Dauntless dive bomber, among many others.
By 1931 Pratt & Whitney had started a development of their single-row Wasp nine-cylinder engine into the larger and much more powerful fourteen-cylinder, twin-row R-1830 Twin Wasp with a similar 1,800 in3 (30 L) displacement that would easily compete with the single-row Cyclone. In 1935 Wright followed P&W's lead, and developed larger engines based on the Cyclone. The result was two designs, a 14-cylinder short stroke design of nearly 2,600 in3 (43 L) displacement that would evolve into the Wright R-2600 Twin Cyclone, and a much larger 18-cylinder design that became the R-3350. A larger twin-row 22-cylinder version, the Wright R-4090 Cyclone 22, was experimented with as a competitor to the 4,360 in3 (71.4 L) displacement four-row, 28-cylinder Pratt & Whitney R-4360 Wasp Major, but was not produced.
With Pratt & Whitney starting development of their own 2,800 in3 (46 L) displacement 18-cylinder, twin-row radial as the R-2800 Double Wasp in 1937, Wright's first R-3350 prototype engines with a 3,350 in3 (54.9 L) displacement were run in May of the same year. Development was slow, due to the complexity, and the R-2600 receiving development priority. The R-3350 did not fly until 1941, after the Douglas XB-19 had been redesigned to use R-3350s instead of Allison V-3420 inlines.
Things changed dramatically in 1940 with the introduction of a new contract by the USAAC to develop a long-range bomber capable of flying from the US to Germany with 20,000 lb (9,100 kg) of bombs. Although smaller than the Bomber D designs that led to the Douglas XB-19, the new designs required just as much power. When four preliminary designs were presented in mid-1940, three of them used the R-3350. Suddenly development was a priority, and serious efforts to get it into production began. In 1942 Chrysler started building the Dodge Chicago Plant, which was ready by early 1944.
By 1943 the new Boeing B-29 Superfortress was flying with R-3350s. The engines remained temperamental, and the rear cylinders tended to overheat, partially due to inadequate clearance between the cylinder baffles and the cowl. A number of changes were introduced to improve cooling, and the aircraft was rushed into service in the Pacific in 1944. This proved unwise, as the early B-29s taking off at maximum weights, in the high temperature conditions of the B-29s tropical airfields, caused overheating that was not completely solved, and the engines also had a tendency to swallow valves. Because of a high magnesium content in the crankcase, engine fires could burn with a core temperature approaching 5,600 °F (3,090 °C) which could burn through the main spar in seconds, causing a catastrophic failure.
Early R-3350s used carburetors, though the poorly designed elbow entrance to the supercharger led to serious problems with fuel/air mixtures. Near the end of WWII, the system was changed to use gasoline direct injection which improved reliability. After the war the engine was redesigned and became popular for large aircraft, notably the Lockheed Constellation and Douglas DC-7.
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Wright R-3350 Duplex-Cyclone
The Wright R-3350 Duplex-Cyclone is an American twin-row, supercharged, air-cooled, radial aircraft engine with 18 cylinders displacing nearly 3,350 cubic inches (54.9 L). Power ranged from 2,200 to 3,700 hp (1,640 to 2,760 kW), depending on model. Developed before World War II, the R-3350's design required a long time to mature, and was still experiencing problems with reliability when used to power the Boeing B-29 Superfortress.
After the war, the engine had matured sufficiently to be used in many civilian airliners, notably in its turbo-compound forms, and was used in the Lockheed L-1049 Super Constellation airliners into the 1950s. Its main rival was the 4,360 in3 (71.4 L), 4,300 hp (3,200 kW) Pratt & Whitney R-4360 Wasp Major, which first ran some seven years after the Duplex-Cyclone. The engine is commonly used on Hawker Sea Fury and Grumman F8F Bearcat Unlimited Class Racers at the Reno Air Races.
In 1927, Wright Aeronautical introduced its "Cyclone" engine, which powered a number of designs in the 1930s. After merging with Curtiss to become Curtiss-Wright in 1929, an effort was started to design an engine in the 1,000 hp (750 kW) class. The new Wright R-1820 Cyclone 9 first ran in 1935, and became one of the most used aircraft engines in the late 1930s and early 1940's, powering the Boeing B-17 Flying Fortress heavy bomber, General Motors FM-2 Wildcat fighter and Douglas SBD Dauntless dive bomber, among many others.
By 1931 Pratt & Whitney had started a development of their single-row Wasp nine-cylinder engine into the larger and much more powerful fourteen-cylinder, twin-row R-1830 Twin Wasp with a similar 1,800 in3 (30 L) displacement that would easily compete with the single-row Cyclone. In 1935 Wright followed P&W's lead, and developed larger engines based on the Cyclone. The result was two designs, a 14-cylinder short stroke design of nearly 2,600 in3 (43 L) displacement that would evolve into the Wright R-2600 Twin Cyclone, and a much larger 18-cylinder design that became the R-3350. A larger twin-row 22-cylinder version, the Wright R-4090 Cyclone 22, was experimented with as a competitor to the 4,360 in3 (71.4 L) displacement four-row, 28-cylinder Pratt & Whitney R-4360 Wasp Major, but was not produced.
With Pratt & Whitney starting development of their own 2,800 in3 (46 L) displacement 18-cylinder, twin-row radial as the R-2800 Double Wasp in 1937, Wright's first R-3350 prototype engines with a 3,350 in3 (54.9 L) displacement were run in May of the same year. Development was slow, due to the complexity, and the R-2600 receiving development priority. The R-3350 did not fly until 1941, after the Douglas XB-19 had been redesigned to use R-3350s instead of Allison V-3420 inlines.
Things changed dramatically in 1940 with the introduction of a new contract by the USAAC to develop a long-range bomber capable of flying from the US to Germany with 20,000 lb (9,100 kg) of bombs. Although smaller than the Bomber D designs that led to the Douglas XB-19, the new designs required just as much power. When four preliminary designs were presented in mid-1940, three of them used the R-3350. Suddenly development was a priority, and serious efforts to get it into production began. In 1942 Chrysler started building the Dodge Chicago Plant, which was ready by early 1944.
By 1943 the new Boeing B-29 Superfortress was flying with R-3350s. The engines remained temperamental, and the rear cylinders tended to overheat, partially due to inadequate clearance between the cylinder baffles and the cowl. A number of changes were introduced to improve cooling, and the aircraft was rushed into service in the Pacific in 1944. This proved unwise, as the early B-29s taking off at maximum weights, in the high temperature conditions of the B-29s tropical airfields, caused overheating that was not completely solved, and the engines also had a tendency to swallow valves. Because of a high magnesium content in the crankcase, engine fires could burn with a core temperature approaching 5,600 °F (3,090 °C) which could burn through the main spar in seconds, causing a catastrophic failure.
Early R-3350s used carburetors, though the poorly designed elbow entrance to the supercharger led to serious problems with fuel/air mixtures. Near the end of WWII, the system was changed to use gasoline direct injection which improved reliability. After the war the engine was redesigned and became popular for large aircraft, notably the Lockheed Constellation and Douglas DC-7.
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