pitching motion during spins
Question of the movement about the lateral axis in spins (light a/c):
Some of my books suggest that during a spin, most a/c will try to recover from the stall, stall again, recover, etc. This results in, but is not described as, pitch oscillations during the spin.
Another book describes the movement during a spin as a corkscrew path while falling nose down.
From what I've seen spinning gliders and some light a/c, I have difficulty accepting the first theory. I do agree that the aircraft pitches, but tend to believe that it pitches up continuously as a spin is a combined movement about all three axes, similar to a barrell roll.
Your thoughts?
Erik.