Not full sized, but R/C models, powered and glider, of various scales, so there may well not be any read across. Control authority in all instances was directly related to C.G. location. At about 25% MAC they wouldn't look at a spin. Back to 28% and with enough control displacement some would, some wouldn't. At 30% and beyond there was rarely any problem getting established and, in general, recovery was easy and predictable. I used to set most of mine up at 30+ for the gliders, so that if you caught a real boomer of a thermal there was a fair chance of getting them back
