An OS .91 4-stroke is plenty of power for what we do. An original Kaos is a small plane. That would probably be too much engine for it. We have pilots fly with different versions of the Kaos, the Dirty Birdy, Daddy Rabbit, Phantom, (and of course the King Altair.....although with that plane a bigger engine would be nice. You have to manage airspeed on the King).

If you can get a hold of the July 2007 Model Aviation, it describes a lot about us, how and why things are as they are.

Duane