The question came up after I built a Dick Sarpolus design called the RIGHT ANGLE. It was a large sport .60 - .90 aerobatic design with a VERY THICK airfoil! (I got the plans from Model Aviation magazine). The length of the constant chord rib (not including aileron) was 11 3/4" and the thickness of the rib was 3". It pulled through maneuvers well, although slowly, and when power was cut, it really slowed up. I needed to make my landing pattern tight if I didn't want to drag it in with power. Aileron control seemed somewhat sluggish (airflow turbulence ???) but very controllable. Stall speed must be really low because my landings were super easy and slow.

Thanks for your replies