Originally posted by SpencerH
My few remaining grey cells kicked in and I recalled that the reason the u-boats couldnt keep up with the convoys was because of the escorts. They had to stay submerged. If they were on the surface they were faster but a target, especially once air cover was available.
My few remaining grey cells kicked in and I recalled that the reason the u-boats couldnt keep up with the convoys was because of the escorts. They had to stay submerged. If they were on the surface they were faster but a target, especially once air cover was available.
Early in the war, subs usually attacked from the surface at night, since they were faster and more maneuverable. In addition, this was before convoys were reintroduced en-mass.
Surfaced, the sub could catch almost any merchant ship, except some fast converted liners used for troop ships. Moreover, when convoys were reintroduced, the convoys speed was determined by the slowest ship in the group, which was usually ~5-8 for the slow convoys, and ~6-12 for the fast convoys.
However, as radar technology increased throughout the war, destroyers could easily spot surfaced subs. Snorkels helped this a bit allowing subs to remain submerged while using their diesels, but they were still slower submerged using a snorkel than surfaced. And once radar technology became more advanced, they could easily spot a snorkel or periscope from a distance.
That's why the Germans focused on making a true submersible, one that would perform better submersed than surfaced. They tried a sub powered by a hydrogen peroxide reactor, but it was too unstable, and would explode at random.
They ended up making an electro-boat, which was faster submerged (22knots, iirc) than surfaced. However, it didn't see any action on its patrols before the wars end.
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