abufletcher

It may be that the (WWI) French sense of "spin" wasn't quite what it is now. Keep in mind that many WWI pilots wee deathly afraid of entering a spin and for a long time it was believed that there was absolutely no way out of a spin. What's illustrated is certainly a "twisting turn" and is that so far from a "spin?"

Regarding the Immelmann, the modern aerobatic version (1/2 loop and a moment of inverted flight at the top before rotating and flying off in the opposite direction) is just ridiculous and not at all a combat maneuver...although I have see it referred to as a method to "escape from the enemy." Back when Immelmann lent it its name it was simply pulling up into a sharp climb and than at the top rotating to dive back down in whatever direction seemed desirable.