FWIW, I think this is one of the greatest ARC/ARFs since sliced bread,,, IMHO
I balanced mine 2 3/4 inchs back from the leading edge at the root next to the fuse. I have had two, still have one,
, I use 3/4 oz tip weight, 63 foot .018 lines eyelet to eyelet, mine has an LA 46 but I use an apc 11.5 x 4 prop. I also added dihedral which is how you fix the wing low problem. FWIW the mod is easy and has been done on a completed model. I also bend the landing gear back so the wheels are under the leading edge, a bit more prop clearance that way and it lands better for me. I like this model so much that I built my Gee Bee model Y around the wing and moments . It also flew awesome!
Just one other note, Pat Johnston turned me on to this idea, I put a one inch wide peice of monokote over the leading edge of the wing and stab, ironed it on, I used a red stripe on mine, Pat a yellow one. This holds the monokote on the wing better so it doesnt want to come loose as easy. Looks kinda cool too.
Have fun with this its a great plane.
a couple picts, one is my GB based on the ARC wing and the other is my ARC P-40 that I converted into a Q model (bubble canopy) bot fly great, well did fly great, the Q ate it after a dandelion got freindly with my lines, the Gee Bee got done in by me on outside squares, but its almost repaired. My ARF also got hurt on outside squares but is repaired and still flying, but it aint so purty so I wont take picts!