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IMO, most useful cooperation will occur prewar. It's pre-Sept 1939 that Germany needs help on carrier warfare, Japan needs aero engine advancement, and the beginnings of (whatever is then available) shipboard radar from Germany to Japan.Germany/Japan: OK, we have the goods, how to deliver them?
Absolutely they do not. Nor do the Germans need battleships.Does Germany really need aircraft carriers?
They got further than the Germans.I did not know Italy was working on aircraft carriers.
The Germans were also wirking on two other carriers, Jade and Elbe, which were to be converted from liners. Neither got very far but in a twist of irony, their sister ship was converted to a carrier by the Japanese. It was the Shinyo.I did not know Italy was working on aircraft carriers.
The surface fleet was a total waste of time, talent and treasure. No, it's not a perfect one for one conversion, but the steel that went into Bismarck and Tirpitz could have instead made thousands of tanks or hundreds of U-boats.The Germans were also wirking on two other carriers