The Lycoming XR-7755 was the largest piston aircraft engine ever built in the United States, with 36 cylinders totaling about 7,750 in3 of displacement and a power output of 5,000 horsepower. It was o
The BMW 803 was a German aircraft engine, an attempt by BMW to build a high-output aircraft engine by coupling two BMW 801 engines back-to-back, driving contra-rotating propellers. The result was a 28
Lycoming XR-7755
…Junkers Jumo 222 BMW 803 Pratt & Whitney R-4360 Wasp Major…
BMW 803 on display at the Deutsches Museum
The large gearbox at the front is evident. The display on the left of the engine shows how the overhead cams were driven off the crank via a series of driveshafts