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30° occurs. In such a condition, the righting moment is so small that 2-3 seas run over the upper deck, without the boat lying on its side making any lurching movements. At Sea State 5 from ahead in the North Sea, "Alle Fahrt" could not be maintained for this reason, and at "Halbe Fahrt", lists of 35° were observed, so that the battery was slightly over-splashed. |
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This condition is naturally the worst when the boat is running with full auxiliary bunkers, i.e. is in the deepest floating position and has little buoyancy. The upper deck is then flooded with moderate swell. The water masses are partly retained due to the deep floating position, but also partly due to insufficient drainage on the upper deck. The latter problem was noticeably remedied with on-board aids by hammering in drainage holes into the outboard sheeting. With the consumption of the fuel oil in the auxiliary bunkers, after blowing out these bunkers, buoyancy and floating position are increased and the latter two phenomena occur less. At the same time, with the use of ammunition and torpedoes, there is a slight improvement in stability, which significantly improves see keeping properties. While with deep-lying boat on the way out in the North Atlantic at Sea State 5 you had to turn your head to the sea, on the way back with the blown-out auxiliary bunkers, the boat stopped admirably in Sea State 8. Movements remained jerky, but this also reflects external influences e.g. can be attributed to seas striking against the tower. Masses of water that filled the upper deck ran off faster. In several successive seas, however, it was clearly observable, due to the immediate appearance, albeit at a smaller list, that the bad stability in deep lying boats can be attributed perfectly to the water masses in the flooded upper deck. |
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