Mark Trent,
That other guy would probably have been me. I firist had a YS120NC, sold that, and put my YS120SC in it, also turning an apc17x6. Battery behind hatck in tail with an additional 4 oz. I tryed an additional 8 ox in tail, flat spins and flight were great, but landings became tricky, and took its toll on the plane. I sold the plane some months ago, I knew I would have crashed it sooner or later, better sell and move on ha ha. I now fly the Aeroworks 80" Extra Profile with a YS140L, an even more fun plane.
DKjens