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Originally Posted by Puster Bill
That isn't necessarily true. A US fleet boat could do 9 knots underwater. A comparable Type IX could do 7, or perhaps less. Even a speedy VIIB could only do 8 knots submerged.
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That does not mean they had better electric engines per se though... Knowing a bit about physics me being a science girl... I'd say the size of the propellors on the American boats was the reason for the faster speed.
They were quite big even compared to the boat they were propulsing. A larger propellor in the water generates more thrust than the smaller props on a U-Boat at the same RPMs, therefore, the boat goes quicker. U-Boats had more in proportion propellors.