I realise you probably can't answer this, BN, but would I be particularly wide of the mark if I were to suggest that the reason you'd prefer to keep the shafts rotating, even if only at very low revs, would relate to lubrication? Specifically of the propeller shaft bearings, turbine spindle bearings etc. Just curious, and I understand you may be incommunicado.
Incidentally, smack, the screw could also be made to rotate - albeit in reverse - by the flow of water past its blades. As you say, simple physics; if the screw is not being rotated in one direction to cause a flow of water in another direction, the process can work in reverse providing there's no brake on the shaft. Just a thought.
While on the subject, I should here provide a note of caution. Optimum realism is all very well, but what we have access to, as civilians, is never going to give us true realism. Short of conducting a simultaneous, worldwide electronic raid on every Navy on earth's records and information, we're never going to get true "realism", merely a pale approximation. Furthermore, a submarine simulation is already a complicated business for the player as it is. I don't bother with SC or DW multiplayer, because I'm more interested in commanding the sub as and when I choose than in spending hours bouncing between stations.
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