Hi Dan. I am currently at 38.8 lb with large Intarico air trap full and 2 sets of 2 cell A123 receiver batteries and 1 3cell A123 turbine battery up in the nose and no lead to balance at 1/2” in front of the back surface of the spar. I was at almost 40 lbs previously with the same batteries plus lead in the nose and with the air trap, pump and fuel sensor back in front of the tank. I also got rid of a ply mounting plate I had to mount these items in front of the tank. I am at 38.4lb with the air trap empty.