Thanks for the info Eric, I think I'll be ordering another one. My test today, with the rearward CG didn't go well. On final I hit just a touch of rudder, to bring the tail around, and it snapped out on me about 10 feet above the ground. It's all over for this one.
I think I went a little overboard moving the tank back to the CG, the plane was very tail heavy, I just didn't think it would snap like that.
Over 100 flights and it's history.

Ken