The starboard engine that's offline charging batteries always runs at the same speed, equivalent to flank speed whatever speed the boat's doing at the time. Check out the rev counters in the control room, to the left of the planesmen. External view shows the starboard screw stopped, but in RL, certainly in later boats, the generator ran the starboard electric motor also, reducing the amount of port helm needed to maintain a straight course. A large rudder angle creates a lot of drag, reducing speed quite a lot.
The crippled Bismarck was forced to run on two of three screws at different speeds, with the rudders jammed 12 degrees to port, and maximum speed was reduced to 10 knots.
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There are only two kinds of vessels; submarines and targets.
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