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BigZ, which flying boats and which bombers did you have in mind?
I have two points of criticism on Tank. One, it took him a long time to get his fighter aircraft ready (though most delays were because of engine problems). Second, the Ta 154 was one of the worst German aircraft designs ever.
Kris
Despite risk of criticizing everyone's opinion ... I think these gentlemen were more managers/businessmen than aircraft designers.
Kris