I've been meaning to do this ever since this thread started and have been too busy to get around to it. But now I have been going through all my planes doing battery and fuel system maintenance, and I finally got around to the Ryobi on my big 76" wingspan Tiger Moth.

It has a Ryobi with a good cylinder with no "smog slits", a Frank Bowman ring, exhaust port timing set to 150 degrees, deck height set to .020", an 11mm carb, electronic ignition set to 28 degrees, an aftermarket two tube muffler and a Top Flite 18 x 6 prop. Nothing special really.

Anyway, it turns the 18 x 6 at 8500 rpms. Yeah I know; I need to put an 18 x 8 or a 20 x 6 on it to get the revs down to a more reasonable 7500 rpms.... With this setup it will easily loop the big Tiger Moth at half throttle.

Here's some pics.

AV8TOR