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Originally Posted by Donner
Quote:
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Originally Posted by pythos
Nice mod, but a problem. The porpoise, Sargo, and Tambor, had three bladed props. The four bladed did not come out until the advent of the Gato class. All boats after had the four bladed model.
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Correct! According to Norman Friedman, author of US Submarines Through 1945: An Illustrated Design History, three bladed props were the norm until Gato-class. I find no mention of five-bladed props for the Balao's. Perhaps this was done after the war? 
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Also around 1943-1944 all US Sub types which under went refit, had been upgraded with 4 the blade props
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