[Onkel Neal]

https://nationalinterest.org/blog/bu...bmarine-112711

While Nautilus would be powered by an all-American nuclear power plant, its hull was German in origin. The United States had not yet developed the teardrop-shaped hull design that is still in use today, and Nautilus resembled the German Type XXI U-boat, the most highly advanced design of the war and the basis for many immediate postwar submarine designs, including the Soviet Whiskey class and UK Porpoise class. Although the use of nuclear power gave it a five-knot advantage over the conventionally powered Tang class, the Type XXI–inspired hull was a compromise between surface and subsurface handling, preventing Nautilus from reaching nuclear power’s promise of thirty-plus-knot sustained speeds.