In the bottom of the pressure hull there is a 0.5 meter high While submerged, the conning tower is enclosed by the conning The substructure of the upper deckĮxtends over the full length of the boat and is welded to the The outer shell encloses the stern, both sides and the bow The conning tower, which is located above the control roomĪt half of the pressure hull length is connected to it by means Type VIIC U-boats are medium sized mixed construction boats. The volume of fuel oil tank 1(internal) was increased from 32.5 m³ in the type VII B to 37.9 m³ in the type VII C. This was achieved by moving the aft bulkhead of main ballast tank 3 one frame forward. Surface range was improved by increasing the fuel oil capacity of fuel oil tank 1 (internal). Diving characteristics, especially in heavy seas, were improved by adding pressure-proof negative buoyancy tanks forward of the port and starboard regulating tanks.Ĥ. Related to above changes, the quite constricted type VII B conning tower dimensions were increased in width by 60 mm and length by 300 mm.ģ. The type VII C boat was lengthened by one frame.Ģ. This space was obtained by lengthening the control room by the distance of one half frame forward of, and one half frame aft of the search periscope. New electronic and communication equipment required more space to install. Nevertheless, even before war time there were attempts to make some other improvements, which eventually led to the Type VII C U-boat:ġ. They fulfilled all requirements completely. The Type VII B U-boats came into service during peace time, but after war broke-out in 1939, they proved their outstanding utility as a prefect front-line submarine. These boats which together formed U-Flotilla "Wegener" (1938) had the aft torpedo tube inside the pressure hull and also some diving and operational improvements and greater propulsion plant performance as a result of installed superchargers. This boat was developed into the Type VII B (displacement 517 tons). Their main distinguishing characteristic was the aft torpedo tube on the upper deck. The first medium size U-boats of the German Navy were the Type VII U-boats (displacement 500 tons) of U-Flotilla "Saltzwedel" (1936).
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