P5M Marlin
From Wikipedia, the free encyclopedia
The Martin P5M Marlin, built by the Glenn L. Martin Company of Middle River, Maryland, was the last flying boat in service with the United States Navy and the US armed forces in general. Built as a successor to the PBM Mariner, the new hull form and new conventional tail were fitted to a Mariner to become the XP5M Marlin prototype.
The Marlin was designed as a gull-winged aircraft to lift the engines and propellers high above the spray. Power was by two Wright R-3350 radial engines. The hull, somewhat inspired by the Japanese Kawanishi H8K of World War II, did not lift sharply from the water at the tail, instead rising up steadily; this gave the aircraft a longer base of flotation and reduced "porpoising" over waves.
The prototype had nose and tail turrets with twin 20 mm cannon in each, as well as a dorsal turret with two 0.5 in (12.7 mm) M2 machine guns. The cockpit area was the same as the Mariner's. It first flew in May 1948.
The first of 167 production P5M-1 aircraft was produced in 1949. 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, a AN/ASQ-8 MAD boom at the rear of the tail-tip, no tail guns, better crew accommodation and an improved bow to reduce spray during takeoff and landing.
Contents |
[edit] Production
- P5M-1 (P-5A) - This was the first production model US Navy. 160 built.
- P5M-1S (SP-5A) - Redesignation of the P5M-1, with upgraded electronic and anti-submarine equipment.
- P5M-2 (P-5B) - This was the second production model for the US Navy. 115 built.
- P5M-1G - Redesignation of seven aircraft used by the US Coast Guard.
- P5M-1T (TP-5A) - Redesignation of former USCG P5M-1Gs, used by the US Navy as crew trainers.
- P5M-2G - Redesignation of four aircraft used by the US Coast Guard.
- P5M-2S (SP-5B) - Redesignation of most P5M-2s after being fitted with advanced avionics, and anti-submarine detection equipment.
- SP-5 - SIGINT/ELINT version used over Viet-Nam.
[edit] Operators
[edit] US Navy
[edit] US Coast Guard
Seven P5M-1Gs and four P5M-2Gs were built for the US Coast Guard for air-sea rescue service, but the service found the planes difficult to maintain and surplus to requirements. They were given to the Navy, which used them as trainers since they had no provision for armament.
[edit] French Navy
The French Navy took delivery of ten ex-USN Marlins in 1959 to replace Short Sunderlands in maritime patrol service, based out of Dakar, Senegal in West Africa. They were returned five years later.
[edit] Specifications (P5M Marlin)
General characteristics
- Crew: 8
- Length: 100 ft 7 in (30.7 m)
- Wingspan: 117 ft 2 in (35.7 m)
- Height: 32 ft 9 in (10.0 m)
- Wing area: 1,406 ft² (130.1 m²)
- Empty weight: 50,485 lb (22,900 kg)
- Loaded weight: lb (33,000 kg)
- Max takeoff weight: 85,000 lb (38,600 kg)
- Powerplant: 2× Wright R-3350-32WA radial engines, 3,450 hp (2,570 kW) each
Performance
- Maximum speed: 251 mph (404 km/h)
- Range: 2,050 miles (3,300 km)
- Service ceiling: 24,000 ft (7,300 m)
- Rate of climb: ft/min (m/s)
- Wing loading: lb/ft² (kg/m²)
- Power/mass: hp/lb (kW/kg)
Armament
- 4x 2,160 lb (980 kg) torpedoes or
- 4x 2,000 lb (907 kg) mines or bombs or
- 8x 1,000 lb (454 kg) mines or
- 16x 500 lb (227 kg) bombs or
- 16x 330 lb (150 kg) depth charges or
- 1x Mk.90 "Betty" nuclear depth charge
Avionics
- AN/APS-44 radar
[edit] Related content
Related development
PBM Mariner - P7M Submaster
Comparable aircraft
Beriev Be-12 - Short Sunderland
Designation sequence
PM - P2M - P3M - P4M - P5M - P6M - P7M
Related lists
List of military aircraft of the United States - List of flying boats and seaplanes
