Good Day Mr. Scurvy.
I am kind of new here too,welcome aboard.I believe the two shafts are available for added realism and manuverability.I'd say if you wanted to turn faster you could just use the one screw.Or if one happpens to get damaged.
Maybe popping up in a harbor or close to a bunch of enemy you could use the electric only engines to keep the noise down.
Just my thoughts,maybe other reasons.
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