gphil, JohnBuckner is spot on correct with his advice to balance @ 25% of the MAC. One other thing to keep in mind as you assemble/build ARF's and kits is that many,many times the printed C.G. spec in the instructions are incorrect. It happens for a variety of reasons but is not uncommon. Always calculate the C.G. yourself and then compare it to the what the instructions say. You will be surprised how often there is disagreement. Go with your calculated 25% of MAC.