@Graf Paper, I think, and i am only speculating right now as i am too lazy to go back to some of my research materials right now, LOL. The reason that the type VIIC was slightly slower than the 7B, was 2 fold, 1 the length because of the redesigned bow was extended and thus the 7C was heavier than the 7B, they both used the same Diesel engine designs, and the same batteries, which as an end result gave the 7C a slighty lower surface and submerged speed AND reduced battery endurance underwater. One interesting thing to note the type VIIC41 had the same surface speed as the type VIIB, and without me doing a quick reference i am curious to know if that was because of the new type of Reenforced steel used, or an improved engine or supercharger? I would be interested to hear any theories.
