Martin PBM Mariner

Patrol bomber flying boat introduced in 1940

A U.S. Coast Guard Martin PBM 5G Mariner taking off from the water.
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credit: U.S. Coast Guard
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The Martin PBM Mariner was developed and produced by Glenn L. Martin Company as a patrol bomber flying boat during the Second World War and the early period of the Cold War. The PBM Mariner was built in addition to the flying boats in service during the time such as the Consolidated PBY Catalina and the PB2Y Coronado. On February 18, 1939, the aircraft took its maiden flight and in September 1940, it entered into service.

Manufacturer:
Glenn L. Martin Company
Country:
United States
Manufactured:
1940 to: 1949
ICAO:
PBM
Price:
Avionics:
Engine:
2x Wright R-2600-6
Piston
Power:
1,600 horsepower
Max Cruise Speed:
178 knots
330 Km/h
Approach Speed (Vref):
72 knots
Travel range:
2,600 Nautical Miles
4,815 Kilometers
Fuel Economy:
Service Ceiling:
19,800 feet
Rate of Climb:
800 feet / minute
4.06metre / second
Take Off Distance:
Landing Distance:
Max Take Off Weight:
26,300 Kg
57,981 lbs
Max Landing Weight:
21,768 Kg
47,990 lbs
Max Payload:
1,180 Kg
2,601 lbs
Fuel Tank Capacity:
2,700 gallon
10,221 litre
Baggage Volume:
Seats - Economy / General:
7 seats
Seats - Business Class:
Seats - First Class:
Cabin Height:
Cabin Width:
Cabin Length:
Exterior Length:
23.5 metre - 77.10 feet
Tail height:
8.38 metre - 27.49 feet
Fuselage Diameter:
2.8 metre - 9.19 feet
Wing Span / Rotor Diameter:
36 metre - 118.11 feet
Wing Tips:
No Winglets

In 1937, a new flying boat powered by twin engines designated as the Model 162 was developed by the Glenn L. Martin Company. It was to take the place of the Consolidated P2Y and was built to be in addition to the PBY Catalina and PB2Y Coronado. On June 30, 1937, an order for a single prototype designated as XPBM-1 was placed. On December 28, 1937, the first production order for twenty-one PBM-1 was received.

The initial production version PBM-1 has an external length of 23.50 meters, an external height of 5.8 meters, and a width of 2.8 meters. It has a tail height of 8.38 meters and a wheelbase of 11.3 meters. The wingspan is 36 meters and the wing area is 131 square meters. The aircraft could accommodate up to seven crew members in flight. The PBM-1 has an empty weight of 15,048 kg and a gross weight of 25,425 kg. The maximum takeoff and landing weights are 26,300 kg and 21,768 kg, respectively. It has a maximum payload of 1,180 kg and a fuel tank capacity of 2,700 US gallons.

The aircraft is powered by two Wright R-2600 also called Twin Cyclone. It is a fourteen-cylinder, supercharged, air-cooled, two-row radial engine which produces a maximum power of 1,600 hp each. It has two pushrod-actuated valves per cylinder with a sodium-cooled exhaust valve, a single-stage two-speed centrifugal-type supercharger, a Stromberg downdraft carburetor with automatic mixture control, a dry-sump with one pressure pump and two scavenge pumps oil system and an air-cooling system.

The PBM-1 has a maximum speed of 178 knots and a travel range of 2,600 nautical miles. It can fly up to 19,800 feet and can climb at a rate of 800 feet per minute. The patrol bomber could be loaded with eight 12.7 mm M2 Browning heavy machine guns located in the nose, tail turrets, and blisters amidships, and 1,800 kg of aerial bombs or depth charges or two Mark 13 torpedoes.

All Glenn L. Martin Company Aircraft