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Type VII B(lv 21 and phase 3)
The Type VII B is the direct successor to the Type VII A.
VII型B式直接繼承了A式的設計
This version is slightly longer owing to the more powerful diesel engines and the larger fuel tanks which gives it a greater water displacement than its predecessor.
這個版本由於更強大的柴油發動機和更大的油箱所以船身更長,使得它的排水量大於它的前輩
The aft torpedo tube is now located inside the pressure hull, so a twin rudder construction was necessary, which also increased the maneuverability of the U-boat.
艦尾魚雷發射管現在位於耐壓船殼內部,所以雙尾舵構造變的必要,這也增加了U艇的機動性
In addition, this U-boat now has a total of 14 torpedoes on board; 3 more than the Type VII A.
此外,該型U艇共有14枚魚雷在船上,比A式多了3枚