I originally built mine pretty much stock, with a .46LA, and it took a couple of ounces on the firewall to balance. I rebuilt it over the winter with larger control surfaces, sheeted turtle deck, balsa wingtips, heavy duty landing gear, and a .55AX, and it balanced with no lead and the battery behind the servo tray.

I was really worried that I was ruining a perfectly good plane with the mods I was making. I probably added about a half pound of weight and about 50% more power to it. I am really happy with the way it now flies, though. It holds a knife edge great, and it has unlimited vertical, but still lands nice and slow.

I thought I loved it when I first built it, but now I REALLY love it. It is just a great model no matter how you build it.