I remember reading an article in a magazine from the 1960's about converting to rc. They added dihedral, and I think used a smaller motor. The balance on a control line is usually farther forward than RC as well. Radios and motors were much different then. Many motors had no throttle, so they were all built a bit underpowered. Things have changed, mostly that the prices of RC stuff is cheaper than U Control stuff now. I was eyeing a OMP Sukoi RC profile plane in my basement to make control line. Going the other way, from rc.