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Radial engine in a biplane. The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is called a "star engine" in some other languages.
A preserved R-2800 engine at the National Museum of the United States Air Force: Type Radial engine: National origin: United States: Manufacturer Pratt & Whitney: First run 1937 First flown May 29, 1940 Major applications: Convair CV-240 family Douglas A-26 Invader Douglas DC-6 Grumman F6F Hellcat Martin B-26 Marauder Republic P-47 Thunderbolt ...
The Pratt & Whitney Wasp was the civilian name of a family of air-cooled radial piston engines developed in the 1920s, 1930s and 1940s. [1]The Pratt & Whitney Aircraft Company (P&W) was founded in 1925 by Frederick B. Rentschler, who had previously been the President of Wright Aeronautical.
With Pratt & Whitney starting development of their own 2,800 in 3 (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 in 3 (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 ...
The R-755 was first run in 1933 and was still in production in the 1970s. With a bore and stroke of 5.25 in × 5 in (133 mm × 127 mm) the displacement was 757 cu in (12.4 L), power ranged from 200 hp to 350 hp (150 kW - 260 kW).
The cowling for this engine gave the plane a more slender and aerodynamic nose. [6] The definitive version of the aircraft was the Fw 44C, which was powered by a Siemens-Halske Sh 14 radial engine instead. [6] The last series version was the Fw 44J, which was sold or built under license in several countries around the world.
The engine was simple and easy to produce, and was predicted to give 340 hp (254 kW) for a weight of 600 lb (273 kg). [2] One distinctive feature was the use of copper -plated cooling fins , which were claimed by Bradshaw to be so effective that water would not boil on the surface of the radiators.
Performance was similar to the equivalent Wright engines. The M-25 was later developed into the ASh-62 and was later used as a pattern for the M-70. The M-70, a twin-row 18-cylinder engine, eventually developed into the ASh-73 which powered the Tupolev Tu-4 , an unlicensed, reverse-engineered copy of the Boeing B-29 Superfortress .