I just got a short kit of the old (1941) Cleveland "Super Condor"FF glider, which I intend to make r/c electric assist.

The plans do not show any CG information. Here is what I have measured from the plans:

Wingspan 84", chord 5", except the tips, which taper.
Wing Area - 324 Sq in
Airfoil is undercambered

Horizontal stab:
66 sq in area, 3" avg chord (4 at the root, 2 at the tip)
Lifting stab, clark-Y airfoil

Without measuring, it looks like the wing and stab are set a about 2 deg positive.

The wing LE is 19" away from the stab LE


My gut feeling is that the CG should be around the middle of the wing flat plan area, but I've seen ff rubber with CGs way further back.