RE: how much weight for cg is to much
Littlera - That link you posted chiefs complaint is fear of the Rx pack close to ignition interferance, please note There are no ignition systems on the two ships I posted with the forward battery and none in the past have had ignition systems either.
Please feel free to ignore the technique however I will continue to use where applicable in some airplanes where required as I have since that first controlline airplane with a four cell pack tucked up in next to the engine, and by my best reckoning I think five other RC aircraft before the two current ones.
John