The Type VIIC appeared through 1940 and 1945 and immediately became the star of the Type VII group, making up over 75% of the groups entire total production. These U-boat types were similar in most respects to their two predecessors with the exception of a slight decrease in speed with an increase in overall weight. Some featured varying weapons loadouts but for the most part, diesel and electric engine performance were about the same as earlier models. As this type represented most of the operating Type VII's in the Atlantic, they appeared everywhere a German u-boat scourge was noted. Some 568 commissioned boats made up this powerful group.
The Type VIIC/41 appeared in about 90 production examples and were naturally based on the Type VIIC. These featured a reinforced pressure hull and reworked internal machinery to compensate for the added steel material. Overall, weapons and propulsion were pretty much the same as the VIIC's. Designations covered U-292 through U-328, U-827 and U-828, U-929 and U-930, U-995, U-997 through U-1025, U-1063 through U-1065, U-1103 through U-1110, U-1163 through U-1172, U-1271 through U-1279, and U-1301 through U-1308.
Other Type VII systems considered but never seeing full-blown production were the "U-flak" as four VIIC boats modified for surface escort duty with improved anti-aircraft armament. U-flaks saw initial success until the Royal Air Force adapted tactics when engaging the type, eventually forcing these flak variants back to their original operating duties under the water. Operational service for the converted U-flaks covered June 1943 through November 1943 before the project was abandoned altogether with limited success. The added firepower proved adept at engaging Allied aircraft (of which some 6 may have been shot down in that period) though the submarine's design still retained its vulnerabilities to enemy fire that could spell assured death for all the crew.
The Type VIIC/42 was contracted for a total of 164 but were eventually given up in favor of the improved and all-new design of the Type XXI. These would have seen a stronger hull and an increase in torpedo-carrying capability.
The Type VIID was produced in six examples (all being lost by war's end) and featured vertical launching tubes for mine dispersal (a fore-runner to modern-day ballistic submarines). This group encompassed U-213 through U-218.
The Type VIIF became the heaviest of the entire Type VII class, produced as torpedo carriers and noted by not having any deck armament. A total of 39 torpedoes could be carried and designations covered U-1059 through U-1062.
At any rate, the Type VII was indeed the cream of the U-boat class - sheer numbers dictated that fact but so did performance and the fear they inflicted on sailors and captains alike. The scourge of the U-boat would have not been so without the Type VII commanding the waters between England and the United States, giving Germany an edge for at least a while - that is until tactics and technology changed in the favor of the Allies. The Type VII would see aggressive combat against Allied shipping and warships through to the end of the war, solidifying its place in naval history. Along with its legacy, u-boat design ushered in a new age of submarines that would dominate the oceans of the world throughout the Cold War and beyond.
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