glowfuel - I always start with the CG about ... ok ... an example ... if it says 100-120 I will keep it at 105 for the maiden. Then I will take it back slowly by moving and shifting things back. For the Aresti I do not measure it, I just add weight till I am happy. Will let you know tomorrow how she flies with added tail weight and I will measure the CG for you. Guess, its my own plane and I don't really bother to measure to know how far I have taken it. Hehehe ... I am so technical and detailed!!! Hahahaha ...