Trim Datum
John ,
workin with a trim Datum of 26.67 is actually giving more accurate numbers e.g.
weight = 95000 kgs , index = -10
FS = -10000/95000 = -0.105263 + 26.67 =26.5647
CG MAC% = (26.5647-25.2132)*100/MAC = 1.35153 *100/5.8287=23.18
which is perfect as seen on the graph
the results match the graph at most combinations of wt/index
tried 140000 and -10 , 140000 and +10 , 140000 and -20 , +20 etc etc