GJ, either you need a different scale or you have the 'Holy Grail' of UCDs. I built a few and they were all around 7-1/2+lbs. give or take a few oz. My present one, when it had a Saito 100 and APC prop, it came in @ 8 lbs. Now with the YS 110 its @ 8.6 lbs. Under repair as we speak so it could possibly get fatter. Out of five builds, they were all pretty close......until this one. Everyone went together exactly the same, so I guess this one was from a heavier batch of balsa or the kid in the assembly line was heavy on the glue. Good luck with that lightweight. Joe