ORIGINAL: ytell
Chnage-of-moment = (moment_flight_start)-(moment_flight_end) = dist_to_LE*(weight_full_tank - weight_empty_tank)
Since the expression in the last parenthesis is greater than zero, I find that CG has changed
Yoav
The expression does not describe the balance of the airplane. It is extremely limited and only describes the effect the weight of the tank has on the moment of the tank relative to an arbitrary point. I assume you're using it to describe why you think it would have an effect.
Would you care to show us an example of a computation you use to establish the location of a CG?