Best engine, ever:
Beautiful. 3 moving parts. THREE. Smooth. Sure it's weak at low RPM and it drinks gas like frat boy drinks beer, but get it above 5 grand and she'll sing. They don't weigh anything compared to how much power they put out. But they aint for everybody.
As an old memory I recall that one consumer reporting company put a huge number of used Mazda vehicles -- almost all rotary-engine models -- on their execration list for poor performance and bad repair history while giving good reviews to Mazda vehicles with conventional engines. The RX model of the time (a simulated sports car) seemed to have worked out the bugs), but all in all the rotary engine was a failure. It looked like a great idea, but something was terribly wrong. At the time it was praising about every contemporary Japanese-made car.