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Originally Posted by joegrundman
but gino, those features you mention are hardly the defining characteristics of the type XX1 and XXIII, are they?
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Nah, not really. But, it does show that the germans used technology which was already used by the US in the Thirties, and from that point 'innovated' their design. Thus making an improved Fleet boat if you like, which the US then used to build their new subs after the war... In their design the germans indeed made some interesting things, like the Nibelungen machine (making it possible to attack with torpedoes from a greater depth) and the Walther propulsion system (which even today find its way in the german subs)
Mind that the Snorkel was not a german invention. Also mind that the Fleetsubs, when Guppied came very close to the XXI speeds (doing this from memory, too lazy to walk to my library...) So, they only had to be 'upgraded'. Again this tells me that the Fleetsub was technologically way beyond the VIIC and the IX types.
groetjes,