Development
Built as evolutionary successor to the PBM Mariner, it had better engines, improved hull form, and more conventional tail. The XP5M Marlin prototypes were based on the last PBM-5 Mariners, the company designation being Model 237. It would be heavily improved again leading to the P5M-2 (Model 237B), which was redesignated SP-5B. A number of P5M-1 models were also used for training, designated TP-5A (after 1962).
Read more about this topic: Martin P5M Marlin
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—Mark Twain [Samuel Langhorne Clemens] (1835–1910)