Hi Don;
Just went down to measure my C G, and it is 4 5/8 from F 3.
I used a JR 3000 ma battery pack for the radio, and a Ni Mh 3000 pack for my PST turbine.
With this set up, I didn't need any additional nose weight, and can get five flights with over 50 % of both packs remaining.
I did put an additional hatch in the bottom of the fuse foreward of the nosegear, so I could get to the packs, and also get them as far foreward as possible.
Good luck
Ron Jahnig