Thanks for the info Guys. I knida figured to balance empty, as that is how is has been for every other plane I have built also. Maybe I didn't word it correctly, but my main concern was flight characteristics and how much they would change as the tank empties.

Most of my other planes have a smaller tank and/or closer to or on the the cg, thus this situation has not been an issue, also not an issue with electrics.. electrons draining don't cause significant weight changes

Oh, egor, good info about the side to side balance. I usually do the string around the motor shaft, and use a t-pin in the rear again with a loop of string. Hang the front from the rafter and loop the rear over a rafter, pull on the rear string and check for side to side balance. One man operation.


Thanks again guys.

R