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I don't know where the CG is to be. |
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P40... You should contact the manufacturers of the aircraft to find out where they have the CG designated.
From there, you will have a spot to place the tank. Ideally, you want the tank situated right over the CG, so that during flight, you won't have a shift in CG when the tank empties. This will happen if the tank is placed either in front of or behind the CG and could create a trim change towards the end of the flight.
Wayne