[HuntsvilleTxVeteran]

"The diagram shows no connection between the compression and drive rotors, "

There is a direct connection!



http://www.starrotor.com/index.htm

[Charles Martel]

Okay, I see it now (had to click the image to see the animation). I had it turned around... the drive rotor is actually the portion that takes combustion energy and turns it into rotation.

The "separate" combustion chamber sort of threw me. It makes more sense if you think of the combustor as part of the drive rotor assembly, which it is (albeit not in a familiar sense).

This thing really is sort of a combination of a Wankel and a jet turbine. I wish them luck with it - should make an interesting aircraft engine, if nothing else.