Jon,

The plans show the CG at 3-3/4" back from the leading edge of the wing (1/8" in front of the Main Spar), or about even with the front of the 2nd window on the fuselage. Adjust to suit your flying style, maybe an 1/8" at a time, this plane is very short coupled, so a little change can make a big difference.

BTW, there was an interesting article in Flying Models magazine (Feb 07) by Dean Pappas in R/C Pattern section on trimming a trainer for better performance and he does mention the flat bottom wing like the LB has. Not that the LB will ever be a pattern plane , it sure is a fun sport plane .