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Twin engine aircraft don't drive a single wheel, and drive, instead, a fluid. In addition, to provide for rpm differential to aid in turns, the two aircraft engines have to be able to operate separately. Again, twin engines provide limp home capability. On the other hand, I believe some twin engine aircraft DO mechanically join the two props, so that one engine can turn both, if the other goes out.
I don't want the engines to phase in and out with each other. Those vibrations would be far less pleasing than eight evenly spaced firings.
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