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Martin P5M Marlin

Maritime Service Flying Boat Aircraft

United States | 1952

"Martin P5M flying boats served both the French and American navies, the aircraft line formally retired in 1967."

Power & Performance
Those special qualities that separate one aircraft design from another. Performance specifications presented assume optimal operating conditions for the Martin P5M Marlin Maritime Service Flying Boat Aircraft.
2 x Wright R-3350-32WA radial piston engines developing 3,450 horsepower each.
252 mph
405 kph | 219 kts
Max Speed
23,950 ft
7,300 m | 5 miles
Service Ceiling
2,051 miles
3,300 km | 1,782 nm
Operational Range
1,200 ft/min
366 m/min
The nose-to-tail, wingtip-to-wingtip physical qualities of the Martin P5M Marlin Maritime Service Flying Boat Aircraft.
100.7 ft
30.70 m
O/A Length
117.1 ft
(35.70 m)
O/A Width
32.8 ft
(10.00 m)
O/A Height
50,486 lb
(22,900 kg)
Empty Weight
85,098 lb
(38,600 kg)
Available supported armament and special-mission equipment featured in the design of the Martin P5M Marlin Maritime Service Flying Boat Aircraft .

Up to 8,640lb of conventional or nuclear stores from torpedoes to bombs and depth charges to naval mines.
Notable series variants as part of the Martin P5M Marlin family line.
P5M - Base Series Designation
XP5M - Prototype
P5M-1 (P5A) - Initial production model; 160 completed.
P5M-1G (P5M-1T) - P5M-1 for USCG service
P5M-1S (SP-5A) - Upgraded electronics; improved submarine hunting equipment; 80 conversion examples.
P5M-1T - USN crew trainers (former USCG mounts).
P5M-2 (P5B) - Upgraded variant; T-style tail unit.
P5M-2S (SP-5B) - Improved submarine hunters
P5M-2G - P5M-2 models for USCG service; 4 examples.
P5M-3 - Proposed prototype Model 313 aircraft with turbojet installation.
P-5A - 1962 redesignation of P5M-1
SP-5A - 1962 redesignation of P5M-1S
TP-5A - 1962 redesignation of P5M-1T
P-5B - 1962 redesignation of P5M-2
SP-5B - 1962 redesignation of P5M-2S

Authored By: Staff Writer | Last Edited: 02/27/2020 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.

World War 2 showcased the value of large flying boats in the long range maritime patrol and anti-shipping roles. The Glenn L. Martin Company, established in 1912, had been building aircraft for some time before the Second World War and it sold various global military services on its PBM "Mariner" flying boat design which appeared in 1940. 1,285 of this aircraft were produced with the last retired from Uruguayan service in 1964. In the post-war years, Martin tried its hand at a modernized version of its Mariner which went on to become the P5M "Marlin" (Model 237). An improvement overall, the aircraft was procured in just 285 examples by the USN/USCG and the French Navy.

Design experience produced an elegant flying boat through smooth lines and an aerodynamically refined form. The aircraft carried the usual boat-like hull seen in others of this class. Other traditional features were also retained - the high-mounted wing mainplanes, leading edge engine nacelles, outboard wing pontoon floats. The cockpit sat high in the fuselage for good vision out-of-the-cockpit. There were two engines - Wright R-3350 radials of 3,450 horsepower - fitted to streamlined nacelles. A single vertical tail fin was used with low-set horizontal planes. In its original form, the aircraft carried cannon-armed turrets at both the nose and tail sections for defense and a 2 x 0.50 caliber heavy machine gun dorsal turret emplacement.

First flight of an XP5M prototype was recorded on May 30th, 1948.

The aircraft was adopted by the USN/USCG as the P5M-1 and an initial order was for 167 examples. By this time, the finalized aircraft was revised some from its prototype days - most notably was the deletion of the nose cannon turret (replaced by AN/APS-44 series radar under a cone assembly) and dorsal turret, introduction of a raised cockpit flight deck for improved vision, and extended engine nacelles. Production of this form began in 1951 with formal service introduction occurring in 1952.

Martin engineers were not done with evolving their Marlin design. The P5M-2 variant appeared in 116 examples with the most obvious difference being the switch to a "T" tail configuration which set the horizontal planes high atop the vertical tail fin. The tail turret was also deleted and an AN/ASQ-8 MAD ("Magnetic Anomaly Detector") boom assembly added. Other equipment added included the AN/APN-122 DNS ("Doppler Navigation Set"). The lines of the hull were also redrawn form better water performance.

While the USCG was an initial recipient of the Marlin (to be used in the SAR role), the aircraft did not live up to the requirements of the service which led to some eleven machines being passed on to the USN which reconstituted them as training platforms under the TP-5A designation. Original USCG designations were P5M-1G (seven examples) and P5M-2G (four examples). From the period of 1957 to 1959, the French Navy borrowed (and returned) at least ten USN P5Ms for service over Senegal.

P5M Marlins served during the Vietnam War (1955-1975) with the United States Navy where they undertook maritime patrol and surveillance missions in an attempt to stem the tide of supplies reaching the enemy by water. Operations were flown into the late 1960s.

In 1962, the United States military revised its aircraft designation system which resulted in the P5M-1 becoming the "P-5A" and the P5M-2 becoming the "P-5B". The other variants followed suit (see variants listing for full breakdown).

The P5M-2S mark were upgraded P5M-2Ss outfitted with Anti-Submarine Warfare (ASW) equipment and upgraded electronics. The P5M-3 (Model 313) was a proposed flying boat of 1956 fitted with a turbojet engine. It competed unsuccessfully with a Lockheed proposal which went on to become the P-3 "Orion" series.

Many of the Marlin production stock were scrapped after their flying days were over. The only known preserved examples resides at the National Naval Aviation Museum in Pensacola, Florida, USA. The aircraft in question made a tribute flight to USN flying boat operations on November 6, 1967 when it flew over Naval Air Station (NAS) North Island and landed on the waters of San Diego Bay.

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Global customers who have evaluated and/or operated the Martin P5M Marlin. Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 285 Units

Contractor(s): Glenn L. Martin Company - USA
National flag of France National flag of the United States

[ France; United States ]
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Going Further...
The Martin P5M Marlin Maritime Service Flying Boat Aircraft appears in the following collections:
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