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Limited underwater speed and battery capacity, they often had to surface to recharge the batteries, a dangerous job, as fumes could be discharged making the ship a sitting duck for even a low flying scout plane with incendiary bullets- or tracers, aim for the battery boxes. The Russians, give "em credit aimed at eliminating part of this hazard with their Turbo-electric two-shaft A-9 class of Fleet or as we would say task-force submarines.designed to operate with surface craft. these had high surface speed- as did the much later Gamma Boats, and could recharge the batteries at ( Siphon depth) with about 2/3 propulsive power available. no US sub could do this at that time (ww-l;) The A-9 was the top=-fleet almost said top-flight Czarisr Russian sub.

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16y ago

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