how to balance low wing aircraft
 

im building a .60 size corospit,
i know that on a high wing trainer, you balance it right side up and it
should be nose heavy


low wing craft are weighed upside down.
should the front of the plane go up or down?

Its pretty much the same as with a high wing, except the plane is upside down. You want the nose to be level or slightly nose down. Its just easier to balance when upside down so it has a lower cg.