That's kind of what I was thinking Tom. So with the basic empty weight add total fuel plus max passenger weight to get to total gross weight and then do the math to find max aft CG? Same with max fwd, except with only one small guy? I noticed on the spread sheet for weight and balance for model 4 on the kitfox website it already list max fwd CG at 10.2 and max aft at 16. shouldn't I fall somewhere close to that?