Greater Underwater Propulsion Power Program
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The Greater Underwater Propulsion Power Program (GUPPY) was initiated by the United States Navy after World War II to improve the submerged speed, maneuverability, and endurance of its submarines. The Navy began the program by testing and reverse engineering two captured Type XXI U-boats: U-2513 and U-3008. That analysis led to four goals: increasing the submarines' battery capacity, streamlining the boats' structures, adding snorkels, and improving fire control systems. The Navy immediately focused on designing a new class of submarines, but the Bureau of Ships believed that the vast fleet of...
The Greater Underwater Propulsion Power Program (GUPPY) was initiated by the United States Navy after World War II to improve the submerged speed, maneuverability, and endurance of its submarines. The Navy began the program by testing and reverse engineering two captured Type XXI U-boats: U-2513 and U-3008. That analysis led to four goals: increasing the submarines' battery capacity, streamlining the boats' structures, adding snorkels, and improving fire control systems. The Navy immediately focused on designing a new class of submarines, but the Bureau of Ships believed that the vast fleet of existing Gato, Balao, and Tench class submarines could be modified to incorporate the desired improvements. In June 1946, the Chief of Naval Operations approved the GUPPY project. The initial two boat test program, implemented by the Portsmouth Naval Shipyard, eventually grew into several successive conversion programs. Those upgrades proceeded in seven variants: GUPPY I, GUPPY II, GUPPY IA, Fleet Snorkel, GUPPY IIA, GUPPY IB, and GUPPY III. Some boats that went through an early phase were then upgraded further in a later phase.
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