Moin,
turning the boat by using opposite speed settings for left/right engine was used to maneuver wherever little space was available, e.g. harbor basins. This maneuver was called "Baksen" in German. But although we have two propeller shafts the game engine only simulates one source of propulsion. What you see at the u-boatīs stern is just eye candy. Therefore this canīt be realized.
Re the use of electric propulsion when surfaced, itīs not possible.
Regards,
DD
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