I will set diesel engines to 7 knots, in my type VII boat, for maximum range. But in rough seas, you will need to use more fuel to keep moving ahead at that pace. I will set the telegraph to 8 knots to achieve a 6-7 knot speed. On a smooth ocean, you can save quite a lot of fuel and extend your range.
FoM
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I am a monster from the deep.........the destroyer of my enemies.
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