Hi Dewey, I'm running an OS FS-30 on mine. Had intended to use a saito 30, but the OS fits the stock mounts a lot better. It's also easier to fit the cowl on witht he OS.

Anyhow, it's one of my favourite small planes. Although the tail surfaces look a little small, it does hover really well with the FS-30 - at less than 1/2 throttle, so punch outs can be dramatic! Best part is that it flies decently on low rates too, so you can fly IMAC patterns. Not as well as a bigger/pattern plane, but this is about as close to a freestyle plane in this size that I've tried.

Mine balances well with the battery stuffed towards the rear of the fuselage.

Hope that helps.