Outside - in the opposite direction from all the other vent The vent valve of main ballast tank 5 opens to the Mainīallast tanks 1 and 5 have flooding slits and one vent valveĮach. The pressure hull under the floor of control room. Tanks 1 and 5 are located respectively at the aft and forwardĮnd of the outer shell, main ballast tank 3 is located inside The buoyancy necessary for surfaced cruise: main ballast Three main ballast tanks are provided, which give the boat The conning tower is enclosed at the top by the bridge deckįabricated from 30 mm thick steel plate, which is welded to The drag of the conning tower during submerged cruise, the tower The radius of the forwardĪrc is 575 mm, and that of the side arcs 2260 mm. Is an ellipse in the aft section and the arc of a circle in The shape of the conning tower in horizontal cross-section Torpedo compensation tanks 2 and 3, forward trim tank. Under floor: stowage for 4 reserve torpedoes or mines, HP air pressure bank 4 and 5, 3 oxygen flasks. Room 6: Forward torpedo room Frame 63 - 80.Ĥ bow torpedo tubes, auxiliary stowage for 2 reserve torpedoes, Room, wash water tank, waste water tank 2, battery room 2. Storage for explosive charges, munitions magazine, active sonar Under floor: fuel oil tank 2 (Frame 48 – 63), Room, automatic battery switch 2, stowage for provisions, W.C., Room 5: Officers- and chief petty officers quartersįrame 50-1/2 - 60, radio- and underwater telegraphy room, listening Of the pressure hull plates decreases towards the ends. Resistance to water pressure at deep depths. Of all welded joints on type VII boats were faulty, due to strict Tested by the shipyard with radiographics. These parts are joined together byĪrc welding, and strengthened from inside by 82 frames - whichĪre made from bulb tee girders – and pressure-proof and The hull consists of one cylindrical and sevenĬone-shaped parts.
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The pressure hull has a circular cross-section over its full 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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