Fuel supply and range were the biggest advantage of the type 9. Unless you consider the 9D2 u cruiser. That one had 14 internal torpedoes, and 12 stored topside in the external canisters, giving it the largest payload of all U-boats. By 1943/44, most of the boats went to sea with the topside canisters removed, but the cruiser, because it was designed for long range patrols was allowed to keep its external ammunition.
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Because I'm the captain, that's why!
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