good morning Kirk,
the cg range is from 2 1/4 to 2 3/4 so I just split the difference for a starting point.
Thanks, I will pick me up a 3 oz tank and give it a go.
Thanks again for all your help, I appreciate it very much.
On another note, the new magnum 15 XL has had 3 two oz tanks run thru it last weekend so I know it could stand a little more run time. I had a mas 8x4 prop on it and it was turning 14,500 rpms on 15% synthetic cool power. Im hoping that when the engine gets a little time on it , the rpms will come up more than that. I ran 1 tank of 30% heli fuel at the end and the rpms came up to 15,100. Is this anything to be concerned about (lower rpms than what I expected)?
John