I flew mine for the first time thinking that the recommended c.g. location was conservitively too far foreward...
BIG MISTAKE![X(] The first flight was an adventure, to say the least!
Anyway, I ended up cutting a hatch opening in the "bow" and added 5 oz. of lead epoxied to the back of the nose block.
It flys great now, with a TT .46 Pro and if you try a few vertical manuvers (like hovering, etc.) you'll find a certain "self leveling" effect due to the pod mounted engine (pulls the nose down, or "tucks" ). It also flys inverted quite well, with the heavy engine/tank pod hanging pendulum like underneath