That I wouldn't know. Other than the naval academy missions, I've only had the pleasure of manning a IIA so far. With both screws, surfaced, I'm lucky to get 11knots in good weather. I think even with the whole crew paddling we might get up to 12 :p
But yeah, if you've been submerged at all, unless you specifically tell the helsman to run standard or whatever, he'll just run one screw and use the other to charge the battery.
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