RE: CG of a Bipe?
I think that there is a thread on this subject,but from what I remember of it is you add the two wingspan cords together and go from there. I would imagine that about 25% of that would be about right. Depending on what the airfoil is makes some difference. You do know to test the balance over some tall grass ,that way you could get some feel as to how it will fly without a wipeout.