Quote:
Originally Posted by frau kaleun
Given the date (late 1943) I'm guessing he spent a good deal of time traveling submerged due to the possiblity of attack by aircraft. Can't get the same top speed submerged that you can on the surface.
Or maybe just slower speed overall to conserve fuel for a particularly long voyage?
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Economical reasons. Longer range with 7kts then with 10 or 15 knots.
