I hope this is the correct section for this question. I had to rebuild my UltraStick 120 light. They are no longer made available by Hanger 9. I re-built the fuse using 1/8" door skin from a local lumber yard. I extended the tail end a couple of inches and increased the lenth forward of the LE of the wing by 3-4 inches. I have installed a CRRC 26ei gas engine for power. Cut a few lightening holes in the tail end just like the original. The wing was o.k. but I recovered it to match my color scheme of the fuse. The original CG from Hanger 9 calls for 4 1/8" aft of the L.E. Well, I am tail heavy even adding extra nose area. The CRRC is not a heavy engine...probably similiar to a Saito 120. I could add weight to the nose, but got wondering if by changing the dimensions of the fuse fore and aft, perhaps my CG needs to be recalculated. I know some of you out there know of a formula(ae) for computing that. If you could share that, it would be appreciated.
Tim in Tacoma