I too have just finished a LT 40 and my plane was very nose heavy. I put the battery and reciever behind the fuel tank like the instructions said and it was really nose heavy. I have a super tigre 51 engine on it which may be the cause for the unbalance. So I put the battery and reciever as far back behind the servo's as I could and it balanced out just perfect. The CG on my plane according to the instructions was 3 1/2 to 4 1/2 behind the leading edge. It said any where in that range would be fine so I chose the middle which was 4 inches back. It balanced perfectly!!!. The plane sets as level as can be. It almost looks like its in flight the way its sets. Great plane, cant wait to fly it.