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German Type XXI U-Boat Kagero Super Drawings in 3D One of the most influential designs in the history of the submarine, the Type XXI was to set standards until the introduction of the nuclear boat a decade later. Though both closed-cycle turbines and diesels had been introduced, both still needed development, so a stopgap high-power electric boat was produced, using mostly established technology. With the lower pressure hull packed with high power density cells, the Type XXIs could, for the first time, develop more power submerged than surfaced. Their main propulsion moto