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| | Greater Underwater Propulsion Power Program - Wikipedia, the free encyclopedia |
 | | GUPPY IIA boats had the same outward appearance as the GUPPY II and IA, except the IIA had only three diesel exhaust outlets, while the earlier conversions had four. |
 | | Those upgrades proceeded in seven variants: Fleet Snorkel, GUPPY I, GUPPY II, GUPPY IA, GUPPY IIA, GUPPY IB, and GUPPY III. |
 | | The GUPPY II conversion, from 1947 to 1951, was generally similar to the GUPPY I except for the sail. |
| en.wikipedia.org /wiki/Greater_Underwater_Propulsion_Power_Program (1357 words) |
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