i just built my first fomie, it weighs about 12oz with an 8 cell, about 150 inches on wing area, it is powered bo a edf 55 150, uses 2 submicro servos with elevon mixing, micro reciever, is this park flier too heavy for the power system, or is it gonna fly like a brick until i get lithiums for it ( not planning on getting them if i dont have to). any suggestions?

Your wing loading is 11.5 oz/sq.ft. - a real floater.

Assuming the CoG is correct, the plane is built straight and true, the incidence angles are correct and the EDF55-150 (am not familiar with that fan) will generate at least 4 oz of thrust, your plane will fly.

The big problem with any scratch build is the CoG location. The CoG is a function of numerous factors which include the areas of the wing and horizontal stab, mean aerodynamic chords and tail moments. If your plane is a delta wing, other factors need to be considered as well.

Regardless, the CoG is determined by the final design. The trick is to balance the plane on (or very near) the CoG.

Good luck with the maiden.