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Type II D(lv12)
The Type II D is the first U-boat equipped with saddle tanks, which are mounted on the exterior of the pressure hull, thus enabling the U-boat to carry extra fuel.
II型D式是第一種配備鞍形油箱的U艇,它們被安裝在耐壓船殼的外部,讓潛艇可攜帶額外的燃料
In addition, more effective use of the space available on board, means that the internal fuel tanks can also be enlarged.
此外,由於更有效的利用船上空間,使得內部油箱也加大
The engine system now has more efficient diesel and electric engines and the U-boat's range is almost double that of its predecessor, the Type II C.
引擎系統使用了更有效的柴油及電動發動機,使得此型U艇的活動範圍跟II型C式比較起來增加一倍