I've tried and can't get a good spin from a Goldber Eagle or a Tower Hobbies Trainer 40. I have to add aileron to make it rotate and I think what I get is more like a diving spiral than a proper spin. I have heard that trainers in general won't spin. The LT40 may be the exception.

I've done full scale spins in Citabrias and Cessnas and in comparison to models they are entered easily and are well defined (no question of whether it is a spin or not). Somehow models aren't the same. Maybe some things don't scale?