Thrash,
No I haven't run that engine. Thank you for the link. It doesn't indicate what prop is used to generate the 28,500 rpms in the specs. If it is the prop that you would fly the plane with that would be pretty good. I would bet that it is a prop that allows the engine to hit max rpms. It also does not indicate where the power or "torque" range is on the engine which is a necessary spec to select the prop and rpm range.

Don't get me wrong, I believe it is a good engine. A .15 Fora, AKM, Cyclon, etc will make 32-35,000 rpm on 10% fuel, running a 6.5X3.5 fiberglass prop. They have to hit these high rpm ranges to develop their power. The CS, Shuriken, or Cyclon 1/2 As will develop over 50,000 rpm on sub 4" props. I have seen Larry Driscoll's 1/2 A RC Combat plane exceed 120mph and fly faster than I could follow it.

None of the engines noted above are really good for RC Combat. You should have three engines and planes to go to a contest and they shouldn't be finicky, delicate, and must have repeatable performance under all conditions. The high performance racing engines are expensive, can be cantankerous and are not really user friendly.

As far as beautiful racing engines go, I've always had a soft spot for a Dooling .29 rear intake. Ever seen one?