At the risk of someone never having patented this idea, some unscrupulous person taking it and running off with my future fortune, I ask, has anyone ever heard of an opposed piston engine in a twingle format. Basically, the opposed piston has no head and a single cylinder, so instead, have two cylinders in a U shape on a common crank with all the other OPE characteristics? Two Saturdays ago I woke up with this idea and it just won't leave me alone. So it's either a really good idea that I don't have the money or ability to put to proof of concept or it's a really good idea somebody else thought of decades ago that no one ever used so it can't be that good of an idea. Either way, I figure the group here are my best chance of having this idea poked and prodded.