Rotary has a fabulous design, but the tried and true piston-based engine still reigns supreme. Once rotary is pefected, it will take my vote. Simply put, Piston based is a solid block, whereas rotary is put together from many components, resulting in leaks and potential engine trouble down the line. I really like the concept behind it though, if they could somehow mix the best features from both and create some kind of super engine, that would be awesome.
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