[Schöneboom]

Re the 90-degree knuckle, I've only used it when attacked by aircraft. It's way better to combine it with a dive to 80 meters or more. I never use the knuckle (or Haken -- "hook" auf Deutsch) against DDs -- I prefer precise control in those situations, alternating between flank & silent, and large & small course changes.

Mach's gut!