The Forgotten HYPER Aircraft Engines of WWII

In the early 30s, in the prelude to WWII, the US Army and the US navy needed production engines that could meet or exceed the 1 hp per cubic inch benchmark. At the time, that power output had only been achieved by several purposebuilt racing engines, but no reproducible production engine had yet fulfilled this need. As a result, the US government financed several highperformance or hyperengine projects, and in todays video, well be taking a look at some of these incredible, forgotten pieces of engineering Like these videos Support the channel on Patreon Follow me on Instagram to get a taste of the airline pilot life: 00:00 Start 00:27 XI2220 04:32 Lycoming 7755 06:50 Wright R2160 08:22 Pratt Whitney Sleeve Valves 09:40 Conclusions