One of the wildest spinning planes I ever had was a Duraplane with a Fox 25. Enter the spin from a full stall, full rudder and up elevator, get the spin started, then go to full down elevator. Found out quickly I had to increase the engine speed from idle or it would shut down from fuel starvation. Without any fuselage side area behind the wing however meant I had to start recovery above 75' altitude. It took about 2 turns to come out of a conventonal spin and 3 to 3 1/2 to leave the flat spin that developed with down elevator.