"Miloch" wrote in message ...
https://en.wikipedia.org/wiki/Pratt_...00_Double_Wasp
Check out this monster: The Lycoming XR-7755 was the largest piston-driven
aircraft engine ever produced, with 36 cylinders totaling about 7,750 in³
(127 L) of displacement and a power output of 5,000 horsepower (3,700
kilowatts). It was originally intended to be used in the "European bomber"
that eventually emerged as the Convair B-36. Only two examples were built
before the project was terminated in 1946. It would have been a maintenance
nightmare.
It makes you wonder where aviation would be today had it not been for the
fortuitous appearance of the gas turbine engine.