"This issue have gotten mythical status on these boards and I hope to get it cleared out.
Since you have talked to so many german pilots, would it be possible to ask this question ; if the pilots used the manual prop-pitch during combat? What situations? was it commonly used or only by experts?
How much gain in speed was there?

I have gotten the impression that most pilots used the autopitch only in combat since the engine was so easily damaged if wrong setting by accident was applied."

I will ask some old Me 109 pilots and return on the issue.

All the best,

Christer Bergström

PS: There are some further updates on the Walter Schuck site.