I recently acquired this old bird. I'm pretty sure it's a Kaos, but not sure which one. Does anybody recognize it?

Had to repair lower planking between wing and tail and reattach the servo rails.

OS sure runs well. Took it to the field yesterday and opened needle 2-1/2 turns. When I spun the spinner in reverse it started first flip.

It is really a nice straight airplane. Needed hardly any trim changes at all.

Ken