I'd like to hear peoples opinions data about what radial engine, in service in 1941 (at least in Dec 1941), could be considered the best. The performance, both down low and high up (leading to suitability both for fighters and bombers), lower weight cross section, reliability, etc. should determine the winner.
We can devote a 'space' for the engines that were flying, albeit not used in the mass produced planes in 1941, but that takes the second seat to the engines in combat use.
We can devote a 'space' for the engines that were flying, albeit not used in the mass produced planes in 1941, but that takes the second seat to the engines in combat use.