At present the model balances at about 40% MAC, which is about 5cm further back than the recommended CG 10-11cm behind the leading edge. This is with the battery and received stuffed into the compartment forward fo the wing LE (the instructions show the receiver and battery in the forward half of the wing saddle area). I'm awfully tempted to move the servo tray forward. Otherwise I think we're talking about at least a pound of lead up front.