The place for technical discussions about GA and flying.
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Flying_john wrote:If the kit or tank maker has not defined the CofG centre for the tank(s) then you have to find where it is before you build the kit by experimentation, or you ask LAA what you should use

As I understand it, this is the issue. 50 people have found the answer by experimentation, and come up with 50 different answers!

Well, maybe not, maybe some used the LAA's figures, but still...
How is that possible - holding the tank in the correct fore and aft plane and you could use your fingers to find where the balance point is and then use a tape measure.

Failing that balance it on and edge of somesort and find the balance point.