I just finished the Tiger 60 I built from a kit. It has a Saito FA-100 and I needed(?) to add 1/2 ounce of weight underneath the engine to balance (slightly nose heavy) at 4" back from the leading edge of the wing. I did convert to a tail dragger and mounted the engine as far forward as possible. My total weight came out at around 8 pounds, as measured on a bathroom scale. I sure hope this thing flies....