As pilots (sailplane fliers aside), we all need our engines. While they’re a source of worry (we do need them to keep running), pain (overhauling one is not for the faint of heart or checkbook) and frustration (who doesn’t have a bad hot-start story?), we still love our engines. Even for non-pilots, they’re fascinating. Watching the history of engines is in many ways watching the history of our technological know-how. Going from pioneering primitive gas piston models to turbines and scramjets, we have seen the capabilities of our airplanes go from just barely flying to out of this world.