• Anything that needs to rev to 9000+ rpm to produce power isn't going to be fuel efficient.

  • Efficiency wasn't an issue, was meeting unburn fuel and carbon oxides at low revs

  • Radial engines are just plain cool. Wankel is fine by me too, but as you stated they've not been fully developed.

    Sort of a non issue anyway as converting energy into motion is much better done with coils of wire and magnetic fields.

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