Video: Flight Demo of Genuine Japanese Zero with ORIGINAL WWII Sakae 31 Engine! This is the ONLY WWII Japanese aircraft that is flyable today with an original Japanese WWII engine, the Mitsubishi Sakae 14-cylinder, Model 31 "Prosperity". A very, very unique and historic sound ! And it is very likely that this is the ONLY original WWII Japanese aircraft engine that any of us will ever to be able to hear in person.