The resulting design used nine banks of four cylinders each at a 40° angle to each adjacent cylinder, arranged around a central crankshaft, to form a four-row radial engine.

The XR-7755-3 is the largest, most powerful reciprocating aircraft engine in the world. During World War II, the U.S. Army Air Forces requested an engine with high takeoff power and low fuel consumption …

The Wasp Major engine was developed near the end of World War II to power the Boeing B-50, an improved version of the successful B-29 Superfortress. The R-4360 is a 28-cylinder, air-cooled radial …

May 20, 2018 · The Lycoming XR-7755 was the most powerful aircraft engine in the world when it was built. The XR-7755 was the culmination of Lycoming’s experience with radial and liquid-cooled …

Feb 7, 2025 · The XR-7755 wasn’t just large—it was one of the most complex aircraft engines ever built, featuring liquid cooling, a four-bank radial layout, and three-speed supercharging for maximum …

During those years, Lycoming put together a team, under the leadership of VP Engineering Clarence Wiegman, to develop this super-size engine. The engine now resides at Silver Hill of the Smithsonian …

This is the story of the single largest aviation radial engine ever designed and produced.

Mar 11, 2023 · They’re much like any other piston powerplant, but with some remarkable differences. We’ve featured a number of radials, but now it’s time to share a look at the most powerful U.S radial …

Jan 30, 2025 · This is a Pratt & Whitney R-4360 Wasp Major aero engine, it has 28 cylinders in four radial rows with a displacement of 4,362.5 cubic inches (71.5 liters) and up to 4,300 bhp when in …

Jun 24, 2025 · With a fan diameter of 134 inches, it claims the title of the largest fan ever fitted on a commercial aircraft engine. The GE9X made its first test flight in 2018, long before the 777X saw …