Martin P5M Marlin

Built as a successor to the PBM Mariner, it had better engines, an improved hull, and a single vertical fin tail. The XP5M Marlin prototypes were based on the last PBM-5 Mariners, the company designation being Model 237. The type was 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). ==Design==

in 1954 SP-5B after the last operational U.S. Navy flight of a Marlin in 1967 The Marlin was designed as a gull-winged aircraft to place the engines and propellers high above the spray. Power was provided by two Wright R-3350 radial engines. The rear hull did not lift sharply from the water at the tail, instead rising up steadily, a Martin innovation; this gave the aircraft a longer base of flotation and reduced "porpoising" over waves. The prototype XP5M-1 had nose and tail turrets with twin cannon in each, as well as a dorsal turret with two 0.5 in (12.7 mm) M2 Browning machine guns. The cockpit area was the same as the Mariner's. It first flew on 30 May 1948. The first of 167 production P5M-1 aircraft was produced in 1951, flying on 22 June 1951. Changes from the prototype included a raised flight deck for improved visibility, the replacement of the nose turret with a large radome for the AN/APS-44 search radar, the deletion of the dorsal turret, and new, streamlined wing floats. The engine nacelles were lengthened to provide room for weapons bays in the rear. The P5M-1 was followed by 116 P5M-2 planes. These had a T-tail to put the tail surfaces out of the spray, an AN/ASQ-8 MAD boom at the rear of the tail-tip, no tail guns (the gun position replaced by the antenna for the AN/APN-122 Doppler Navigation Set), better crew accommodation, and an improved bow to reduce spray during takeoff and landing. ==Operational history==

U.S. Navy The last flying boat operations of the United States Navy were Operation Market Time patrols by Patrol Squadron 40 (VP-40) during the Vietnam War. Maritime surveillance patrols began in February 1965 to locate small craft transporting supplies from North Vietnam to Viet Cong units in South Vietnam. VP-40 operated from seaplane tenders and patrolled off the Mekong Delta between Phú Quốc and Vung Tau. VP-40 carried out the final U.S. Navy Marlin flight, which landed on San Diego Bay in California on 6 November 1967. The last U.S. Navy P5M, redesignated an SP-5B in 1962, was flown to Naval Air Station Patuxent River, Maryland, on 12 July 1968 for interim storage pending construction of a display area for it at the Smithsonian Institution in Washington, D.C. As a display area at the Smithsonian did not materialize, the aircraft later was moved to the National Naval Aviation Museum at Naval Air Station Pensacola, Florida, where it was on display as of 2010. U.S. Coast Guard Seven P5M-1Gs and four P5M-2Gs were built for the United States Coast Guard for air-sea rescue service, but the Coast Guard found the planes difficult to maintain and surplus to requirements. They were subsequently transferred to the U.S. Navy, which redesignated them TP-5As and used them as training aircraft because they had no provision for armament. French Navy The French Navy took delivery of ten former U.S. Navy Marlins between 1957 and 1959 to replace Short Sunderlands in maritime patrol service. They were based at Dakar, Senegal, in West Africa. They were returned to the U.S. Navy in 1964. ==Variants==

Company designations ;M-237: Company designation for P5M-1 ;M-237B: Company designation for P5M-2 ;M-270: XP5M-1 prototype converted with a revised hull. ;M-290: Company designation for P5M-3 which was completely revised into the unbuilt four-engine P7M SubMaster Pre-1962 designations ;XP5M-1 :Prototype converted from a PBM Mariner with modified hull and tail. ;P5M-1 :Production model for the United States Navy, 160 built, later redesignated P-5A. ;SP-5A :P5M-1S redesignated in 1962. ;TP-5A :P5M-1T redesignated in 1962. ;P-5B :P5M-2 redesignated in 1962. ;SP-5B :P5M-2S redesignated in 1962. ==Operators==

; France • French Navy ; United States • United States Coast Guard • United States Navy ==Surviving aircraft==

One SP-5B is located at the National Naval Aviation Museum at Naval Air Station Pensacola, Florida. This aircraft, BuNo 135533, is believed to be the last remaining example of the Marlin. It is now displayed inside the new hangar (as of the spring of 2010) and much of the exterior has been restored. The restoration is being financed by the museum and the Mariner/Marlin Association. ==Specifications (P5M-2)==