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Type II-B German U-Boat
The Type II-B was a slightly improved version of the original 'dugout canoe' primarily with increased bunkers and radius. Only a handful were built; U-7 through U-24 plus U-120 and U-121. They were used mainly for training. The Type II-B carried six torpedoes or eight mines.
Type II-C German U-Boat
The Type II-C was a slightly improved version of the Type II-B with increased bunkers and radius plus slightly more powerful electric motors. Only a handful were built; U-56 through U-63 and were used mainly for training. The Type II-C carried six torpedoes or eight mines.
Type VII-B German U-Boat
The Type VII-B was slightly enlarged over the initial variant and the saddle tanks were modified to improve seaworthiness as well as extend bunker capacity and range. More powerful diesels were installed for greater surface speed.
More VII-B boats were built than the initial variant, but still not so many. They were U-45 through U-55; U-73 through U-76; U-83 through U-87 and U-99 through U-102. The three top ACES of the early years drove Type VII-B boats. All three were sunk early in the war - Prien on 7 March 1941 then Schepke and KRETSCHMER within hours of one another on 17 March 1941.
German U-Boat History - Sharkhunters - German U-Boat History - Official Publication
The Type II-B was a slightly improved version of the original 'dugout canoe' primarily with increased bunkers and radius. Only a handful were built; U-7 through U-24 plus U-120 and U-121. They were used mainly for training. The Type II-B carried six torpedoes or eight mines.
Type II-C German U-Boat
The Type II-C was a slightly improved version of the Type II-B with increased bunkers and radius plus slightly more powerful electric motors. Only a handful were built; U-56 through U-63 and were used mainly for training. The Type II-C carried six torpedoes or eight mines.
Type VII-B German U-Boat
The Type VII-B was slightly enlarged over the initial variant and the saddle tanks were modified to improve seaworthiness as well as extend bunker capacity and range. More powerful diesels were installed for greater surface speed.
More VII-B boats were built than the initial variant, but still not so many. They were U-45 through U-55; U-73 through U-76; U-83 through U-87 and U-99 through U-102. The three top ACES of the early years drove Type VII-B boats. All three were sunk early in the war - Prien on 7 March 1941 then Schepke and KRETSCHMER within hours of one another on 17 March 1941.
German U-Boat History - Sharkhunters - German U-Boat History - Official Publication