I teach in the Pitts S-2B, and Extra 300 full size, plus compete in unlimited in my Pitts S1S, and I absolutely agree that the PARE recovery works every timein a full size. However, models often take power to recover from flat spins. I flew models well before I flew full size, and I had the engine quite a couple times during a flat spin... both times the plane spun to the ground even with full opposite rudder and full down elevator.

At the flight school I work for ALL private pilots are taught spins before they solo... I do quite a few of these spin lessons for the other instructors students. So far I've had about 4 students with modeling backgrounds, one of which competed in IMAC for quite some time, all of them thought that they should use power during the spin recovery because of their modeling backgrounds. The differences are pretty extreme between full size and models... The mass distribution, wing loading, and definately the power loading are all very different. If an Extra 300 weighed 800 lbs instead of 1500, and had 600 horsepower instead of 300 it would probably come close to a typical model. In fact Wayne Handley could do a power on Recovery from a flat spin in the Raven which came close to a model in power loading.

One more note, gyroscopic reaction from the prop only flattens the spin when in an upright spin with left rudder, or an inverted spin with right rudder... Going the other way gyroscopic reaction drags the nose down and accelerates the spin... which is more dangerous then a flat spin in my opinion.