Lets address spins a little more...Did you all know, that in Full-Scale competition a flat spin is scored just the same at 60 degrees nose down as it would be completely flat? OK, now we are getting somewhere. 60 degrees nose down spinning is considered flat in full scale. this is per IAC regulations. Correct me if i'm wrong aero sport ty but i believe those are still standard rules.
The Full scale Extra 300 is 1380 lbs empty weight, and with only 300 horse it is an awesome performer. We generally get 3600 FPM climb rate with two people and full fuel, where as your average 150 horse 172 would be lucky to get 1000. The Extra's spin rate just accelerates when power is applied. The best spin you can get out of one is inverted full forward left stick and right rudder to break into it, then gradually push the stick (while maintaining full forward) to the right putting the ailerons into the spin. Go full power and it will flatten out extremely nice. The exact same technique works excellent in models as well. It will take an extremely powerful engine in a full scale to blow it out of a spin. Now, most people cannot understand why jets have a hard time getting out of a spin. That is because of gyroscopic procession (A characteristic of all rotating bodies, when a force is applied to the outside of a rotating body, parallel to its axis of rotation, the rotating body tilts 90 degrees in the direction of rotation from the point where the force was applied) acting on a jet is so great. What gyroscopic procession does is actually holds the tail of your airplane down. Reducing power reduces the gyroscopic procession, and applying control forces to counteract the direction of rotation gets things straight and level again. In an Extra you might be getting 15,000-25,000 pounds of gyroscopic force in a spin at full power. A jet generates almost 90,000 pounds at idle. Therefore when you get in a spin in a jet, you got your hands full and your best options are to plug in the burner maximizing thrust and actually blowing the airplane in to flight again. Also, please remember that it takes two turns for a spin to fully develop. So always remember that if things look crazy in the first turn it's time to go PARE. Another important point I would like to address is called yaw coupling or a moment of inertia. Many full scale pilots got into trouble by placing their batteries in the tail of their Pitts while trying to balance them after putting bigger engines in them. Kinda like we do in our models with battery packs right? Well, making it tail heavy by adding weight in that tail creates a moment of inertia when you begin to spin. Before you do that, consider the fact that you may or may not have enough rudder to break that moment of inertia that is going to build from rotation of that extra weight in the tail of your airplane.
Just my .02 worth,

Dan Payne
Hangar A Aero Services
Dayton, TN