Hamers, sorry to have to bring this up...again..
But you seem to misspell his name a lot. It's Actually "Ernst Udet" not "Ernst Undet"
The misspelling doesn't really bother me but do you realise who his name is a tribute to?
en.m.wikipedia.org/wiki/Ernst_Udet
Read this and you may understand. By the way, the real Ernst Udet was the inspiration for the character "Ernst Kessler in the movie "The Great Waldo Pepper".