Sorry to necro this thread after a month, but I don't know why I didn't reply. I am still curious about this.
The type XXI modelled in Operation Monsun is clearly not some kind of barely cloaked XXIII, it's definitely it's own boat with a lovely model and all. The thing does run for a fair time underwater, and while I haven't tested how far, the big problem with it is the fact that it takes almost two days to charge the batteries under most conditions. I started this thread to ask about that. Is there any data on how long it would normally take? Should it simply be a matter of multiplying engine performance by time to see how long it would take to generate x number of joules for the batteries?
Incidentally you mentioned that snorkeling leaves a boat deaf, blind, and a very blatant target for late war radar. Two questions to that: firstly at what point in the war did allied radar have the ability to see a snorkel from the air? And secondly, didn't the snorkel have a radar detector on it? Wouldn't that give away any aircraft that spotted it?
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