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
P5M-1 of VP-45 in 1954A VP-40 SP-5B after the last operational U.S. Navy flight of a Marlin in 1967A 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-3350radial 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.[2]
The prototype had nose and tail turrets with twin 20 mm (0.79 in) 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.[3]
The first of 167 production P5M-1 aircraft was produced in 1951, flying on 22 June 1951.[3] 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 Market Time patrols of VP-40.[4] Maritime surveillance patrols began in February 1965 to locate small craft transporting supplies from North Vietnam to Viet Cong units in South Vietnam.[5] VP-40 operated from seaplane tenders and patrolled off the Mekong delta between Phú Quốc and Vung Tau.[6] The last U.S. Navy P5M, redesignated as SP-5B, was flown to NAS Patuxent River, Maryland on 12 July 1968 for interim storage pending construction of display area at the Smithsonian Institution in Washington, D.C. As a display area at Smithsonian did not materialize, the aircraft was later relocated to the National Naval Aviation Museum at NAS Pensacola, Florida where it is currently on display.[7]
The final Marlin flight was carried out by VP-40, to San Diego Bay on 6 November 1967.[8]
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 they found the planes difficult to maintain and surplus to requirements. They were subsequently transferred to the U.S. Navy, which redesignated them as TP-5As and used them as training aircraft, since 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, based in Dakar, Senegal in West Africa. They were returned 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.[9]
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.[10]
Modified P5M-1 with upgraded electronic and anti-submarine equipment, eighty conversions, later redesignated SP-5A.[10]
P5M-1T
Seven former USCG P5M-1Gs returned to Navy as crew trainers and one former P5M-1, later redesignated TP-5A.[10]
P5M-2
Updated model, 108 built for the U.S. Navy and 12 built for the French Navy. The P5M-2 featured a T-tail in lieu of the low mounted horizontal stabilizer used on the P5M-1s. United States aircraft were later redesignated P-5B.[10]
P5M-2S
Most P5M-2s were modified with upgraded electronic and anti-submarine equipment, later redesignated SP-5B.[10]
P5M-2G
Four P5M-2s built for the USCG, later transferred to U.S. Navy as P5M-2s.[10]
P5M-3
Completely revised as four-engine M-313 P7M-1 SubMaster. Mockup built in 1956 but lost to Lockheed P-3 Orion.
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.[12]
Specifications (P5M-2)
3-view line drawing of the Martin P5M-2 Marlin
Data from United States Navy aircraft since 1911,[13] Jane's all the World's Aircraft 1957–58,[14] American flying boats and amphibious aircraft : an illustrated history[15]
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)
Empty weight: 50,485 lb (22,900 kg)
Gross weight: 76,595 lb (34,743 kg)
Max takeoff weight: 78,000 lb (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
^"P5M Marlin/135533." National Naval Aviation Museum. Retrieved: 21 February 2015.
^Swanborough, Gordon; Bowers, Peter M. (1976). United States Navy aircraft since 1911 (2nd ed.). Annapolis: Naval Institute Press. p. 325. ISBN0870217925.
^Bridgman, Leonard, ed. (1957). Jane's all the World's Aircraft 1957–58. London: Sampson Low, Marston & Company, Ltd. pp. 334–335.
^Johnson, E.R. (2009). American flying boats and amphibious aircraft : an illustrated history. Jefferson, North Carolina: McFarland & Co. pp. 258–264. ISBN978-0-7864-3974-4.
Bibliography
Andrade, John, U.S.Military Aircraft Designations and Serials since 1909, Midland Counties Publications, 1979, ISBN0-904597-22-9.
Barth, Bruce D., "The Martin P5M 'Marlin'". Pacific Aero Press, 1994.
Roberts, Michael D. Dictionary of American Naval Aviation Squadrons: Volume 2 The History of VP, VPB, VP(HL) and VP(AM) Squadrons. Washington DC: Naval Historical Centre, 2000.
Swanborough, Gordon and Bowers, Peter M. United States Navy Aircraft since 1911. London:Putnam, Second edition 1976. ISBN0-370-10054-9.
Wikimedia Commons has media related to Martin P5M Marlin.
July 28, 2023
martin, marlin, marlin, after, 1962, built, glenn, martin, company, middle, river, maryland, twin, piston, engined, flying, boat, that, entered, service, 1951, served, into, late, 1960s, with, united, states, navy, performing, naval, patrols, also, served, wit. 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 P5M P 5 MarlinU S Coast Guard Martin P5M 2G MarlinRole Patrol aircraftManufacturer Glenn L Martin CompanyFirst flight 30 May 1948Introduction 1952 1 Retired 1967 1 Status RetiredPrimary users United States NavyUnited States Coast Guard French NavyNumber built 285Developed from Martin PBM Mariner Contents 1 Development 2 Design 3 Operational history 3 1 U S Navy 3 2 U S Coast Guard 3 3 French Navy 4 Variants 4 1 Company designations 4 2 Pre 1962 designations 4 3 Post 1962 designations 5 Operators 6 Survivors 7 Specifications P5M 2 8 See also 9 References 10 External linksDevelopment EditBuilt 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 Edit P5M 1 of VP 45 in 1954 A VP 40 SP 5B after the last operational U S Navy flight of a Marlin in 1967 A French P5M 2 in 1957The 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 2 The prototype had nose and tail turrets with twin 20 mm 0 79 in 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 3 The first of 167 production P5M 1 aircraft was produced in 1951 flying on 22 June 1951 3 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 EditU S Navy Edit The last flying boat operations of the United States Navy were Market Time patrols of VP 40 4 Maritime surveillance patrols began in February 1965 to locate small craft transporting supplies from North Vietnam to Viet Cong units in South Vietnam 5 VP 40 operated from seaplane tenders and patrolled off the Mekong delta between Phu Quốc and Vung Tau 6 The last U S Navy P5M redesignated as SP 5B was flown to NAS Patuxent River Maryland on 12 July 1968 for interim storage pending construction of display area at the Smithsonian Institution in Washington D C As a display area at Smithsonian did not materialize the aircraft was later relocated to the National Naval Aviation Museum at NAS Pensacola Florida where it is currently on display 7 The final Marlin flight was carried out by VP 40 to San Diego Bay on 6 November 1967 8 U S Coast Guard Edit Seven P5M 1Gs and four P5M 2Gs were built for the United States Coast Guard for air sea rescue service but they found the planes difficult to maintain and surplus to requirements They were subsequently transferred to the U S Navy which redesignated them as TP 5As and used them as training aircraft since they had no provision for armament French Navy Edit The French Navy took delivery of ten former U S Navy Marlins between 1957 and 1959 to replace Short Sunderlands in maritime patrol service based in Dakar Senegal in West Africa They were returned in 1964 Variants EditCompany designations Edit M 237 Company designation for P5M 1 M 237B Company designation for P5M 2 M 270 XP5M 1 prototype converted with a revised hull 9 M 290 Company designation for P5M 3 which was completely revised into the unbuilt four engine P7M SubMasterPre 1962 designations Edit XP5M 1 Prototype converted from a PBM Mariner with modified hull and tail 10 P5M 1 Production model for the United States Navy 160 built later redesignated P 5A 10 P5M 1G Modified P5M 1 for the United States Coast Guard seven conversions later returned to the Navy as P5M 1T 10 P5M 1S Modified P5M 1 with upgraded electronic and anti submarine equipment eighty conversions later redesignated SP 5A 10 P5M 1T Seven former USCG P5M 1Gs returned to Navy as crew trainers and one former P5M 1 later redesignated TP 5A 10 P5M 2 Updated model 108 built for the U S Navy and 12 built for the French Navy The P5M 2 featured a T tail in lieu of the low mounted horizontal stabilizer used on the P5M 1s United States aircraft were later redesignated P 5B 10 P5M 2S Most P5M 2s were modified with upgraded electronic and anti submarine equipment later redesignated SP 5B 10 P5M 2G Four P5M 2s built for the USCG later transferred to U S Navy as P5M 2s 10 P5M 3 Completely revised as four engine M 313 P7M 1 SubMaster Mockup built in 1956 but lost to Lockheed P 3 Orion Post 1962 designations Edit P 5A P5M 1 redesignated in 1962 11 SP 5A P5M 1S redesignated in 1962 11 TP 5A P5M 1T redesignated in 1962 11 P 5B P5M 2 redesignated in 1962 11 SP 5B P5M 2S redesignated in 1962 11 Operators Edit FranceFrench Navy United StatesUnited States Coast Guard United States NavySurvivors EditOne 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 12 Specifications P5M 2 Edit 3 view line drawing of the Martin P5M 2 MarlinData from United States Navy aircraft since 1911 13 Jane s all the World s Aircraft 1957 58 14 American flying boats and amphibious aircraft an illustrated history 15 General characteristicsCrew 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 Empty weight 50 485 lb 22 900 kg Gross weight 76 595 lb 34 743 kg Max takeoff weight 78 000 lb 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 propellersPerformance 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 Power mass 0 13 kW kgArmament up 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 Mk 90 Betty nuclear depth chargeAvionics AN APS 44 radar later replaced by AN APS 80 radar Julie echo ranging active sonar AN AQA 3 Jezebel acoustic search passive sonarSee also EditRelated development Martin PBM MarinerAircraft of comparable role configuration and era Beriev Be 12 Shin Meiwa US 1A Short SunderlandRelated lists List of flying boats and floatplanes List of military aircraft of the United States List of United States Navy aircraft designations pre 1962 References EditNotes a b Roberts 2000 p 663 Bonnier Corporation August 1948 Longer Hull Safer Landing Popular Science Bonnier Corporation p 90 a b Swanborough and Bowers 1976 p 323 An Illustrated Guide to The Air War Over Vietnam by Nalty Bernard C Watson George M and Neufeld Jacob Arco Publishing 1981 pp 106 107 The Naval Air War in Vietnam by Mersky Peter B and Polmar Norman Nautical and Aviation Publishing Company of America 1981 p 30 The Vietnam War by Bonds Ray Salamander Books 1979 p 132 Flecknoe Harold J Progress United States Naval Institute Proceedings October 1968 Jones Tom November 2016 Sub Hunts in a Seaplane Air amp Space Smithsonian Retrieved 23 February 2019 Aviation Week 1952 06 23 23 June 1952 a b c d e f g h Andrade 1979 p207 a b c d e Andrade 1979 p157 P5M Marlin 135533 National Naval Aviation Museum Retrieved 21 February 2015 Swanborough Gordon Bowers Peter M 1976 United States Navy aircraft since 1911 2nd ed Annapolis Naval Institute Press p 325 ISBN 0870217925 Bridgman Leonard ed 1957 Jane s all the World s Aircraft 1957 58 London Sampson Low Marston amp Company Ltd pp 334 335 Johnson E R 2009 American flying boats and amphibious aircraft an illustrated history Jefferson North Carolina McFarland amp Co pp 258 264 ISBN 978 0 7864 3974 4 BibliographyAndrade John U S Military Aircraft Designations and Serials since 1909 Midland Counties Publications 1979 ISBN 0 904597 22 9 Barth Bruce D The Martin P5M Marlin Pacific Aero Press 1994 Roberts Michael D Dictionary of American Naval Aviation Squadrons Volume 2 The History of VP VPB VP HL and VP AM Squadrons Washington DC Naval Historical Centre 2000 Swanborough Gordon and Bowers Peter M United States Navy Aircraft since 1911 London Putnam Second edition 1976 ISBN 0 370 10054 9 The Illustrated Encyclopedia of Aircraft Part Work 1982 1985 1985 Orbis Publishing Page 2420External links Edit Wikimedia Commons has media related to Martin P5M Marlin Naval Aviation Museum Aircraft P5M 2S SP 5B Marlin Retrieved from https en wikipedia org w index php title Martin P5M Marlin amp oldid 1142017006, wikipedia, wiki, book, books, library,
