thanks Mike. The 45MG is winging its way to me from my local hobby store. Regardless of the plane, it seems a versatile enough engine to find its way into anything. I particularly liked the sound of the cannister, so I'm thinking the plane must be able to handle this mod with ease! (I'm no builder, even assembling the wings at the field is an acheivement as far as I'm concerned!!!).
In Australia, there is 7kg weight restiction. Anything above that needs a certificate of airworthiness. No big deal really, but enough to make a concerted effort to keep below the limit. Maybe the QQ Yak if the WH is to problematic for the cannister.

Thanks for the info on the thread.
Mike.