Hi
as for the Swiss Bückers:
A stands for “Ausbildung” = Training, i.e. Basic Training, Advanced Training, Aerobatics
U stands for “Umschulung” = Conversion Training, but also used for Advanced Training and Aerobatics
you may have noted the “RV” letters on the Bücker’s tails……
this stands for “Rückenvrille” = Inverted Spin; aircraft equipped with special carebuttors to the engines that allowed inverted manouvers were marked with the “RV”, i.e. these aircraft were cleared for this form of aerobatics.
and Stieglitz
here’s a Swedish beauty for you:
Martin
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