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Martin P5M
Marlin (P-5 Marlin

General information
Type Patrol aircraft
Manufacturer Glenn L. Martin Company
Status Retired
Primary users United States NavyUnited States Coast Guard
French Navy
Number built 285
History
Introduction date 1952
First flight 30 May 1948
Retired 1967
Developed from Martin PBM Mariner
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History Martin Aircraft Company
Martin P5M Marlin (P-5 Marlin

Introduction date 1952,  First flight 30 May 1948 



The Martin P5M Marlin (P-5 Marlin after 1962), built by the Glenn L. Martin Company of Middle River, Maryland, was a twin piston-engined flying boat that entered service in 1951, and served into the late 1960s with the United States Navy performing naval patrols. It also served with the United States Coast Guard and the French Navy. 285 were produced.

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

A VP-40 SP-5B after the last operational U.S. Navy flight of a Marlin in 1967
A French P5M-2 in 1957
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.

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Martin P5M Marlin (P-5 Marlin

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General characteristics

    • Crew: 11
    • Length: 100 ft 7 in (30.66 m)
    • Wingspan: 117 ft 2 in (35.71 m)
    • Height: 32 ft 9 in (9.98 m)
    • Wing area: 1,406 sq ft (130.6 m2)
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Powerplant

    • Empty weight: 50,485 lb (22,900 kg)
    • Gross weight: 76,595 lb (34,743 kg)
    • Max takeoff weight:  (35,380 kg)
    • Powerplant: 2 × Wright R-3350-32WA Duplex-Cyclone 18-cylinder air-cooled radial piston engines with water injection, 3,450 hp (2,570 kW) each
    • Propellers: 4-bladed fully-reversible constant-speed propellers
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Specifications

    • Maximum speed: 251 mph (404 km/h, 218 kn) at sea level
    • Cruise speed: 150 mph (240 km/h, 130 kn) at 1,000 ft (300 m)
    • Range: 2,050 mi (3,300 km, 1,780 nmi)
    • Service ceiling: 24,000 ft (7,300 m)
    • Rate of climb: 1,200 ft/min (6.1 m/s)
    • Wing loading: 60.5 lb/sq ft (295 kg/m2
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Performance

  • p to 8,000 lb (3,600 kg) internally in nacelle bomb-bays + up to 8,000 lb (3,600 kg) externally under the wings

    • 4 × 2,160 lb (980 kg) torpedoes or
    • 4 × 2,000 lb (907 kg) mines or bombs or
    • 8 × 1,000 lb (454 kg) mines or
    • 16 × 500 lb (227 kg) bombs or
    • 16 × 330 lb (150 kg) depth charges or
    • 1 × Mark 90 nuclear bomb nuclear depth charge
                                                                                                                    
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