Outstanding! 2 oz. won't be enough, and if you can find the 3 oz. Hayes tank, this is the one for competition. I use a 4 oz. tank for sport combat. The CG instructions on the Ripper are not real specific, but the CG is pretty important on this model. Put your forefingers about at the spar and see how the model balances. It should be nose heavy. Keep moving your fingers forward to about 1/2" forward of the spar. That's the true CG point, at least for my Rippers. If you can have a nice level airframe somewhere between these two reference points, you will be fine, just don't fly it tail heavy![:-]
Regards,
Mike