Because I did some spin training in a glider (full scale), and thought... hmmmm..... why do models come out of spins so much more easily? That spurred my interest.

Jim for a littlebit of money go get yourself a VMAR Piper Tomahawk. They do REALLY exciting inverted spins from the top of a loop if you get too slow. I THINK I was mashing full UP elevator and opposite rudder when it finally stopped stirring and headed straight down. THEN I had to worry about the secondary stall VS hitting the ground due to lack of altitude. Felt pretty real to me