P-2 Neptune

The Lockheed P-2 Neptune (until 1963 the P2V Neptune) was a naval patrol bomber and anti-submarine warfare (ASW) aircraft for the United States Navy between 1947 and 1978, replacing the PV-1 Ventura and PV-2 Harpoon and being replaced in turn with the P-3 Orion. Designed as a land-based aircraft, the Neptune never made a carrier landing, although a small number of aircraft were converted for carrier use and successfully launched. The type was successful in export, seeing service with the armed forces of Argentina, Australia, Brazil, Canada, Chile, France, Britain, Japan, the Netherlands and Portugal. The Neptune shares the P-2 designation (albeit under a different designation system) with the Curtiss P-2 Hawk, a much earlier biplane.

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Early Neptunes

Development began early in World War II, but was considered a low priority and it was not until 1944 that things really got going. A major factor in the design was ease of manufacture and maintenance, and this can be said to have been a major factor in the type's long life and worldwide success. The first aircraft flew in 1945. Production began in 1946, and the aircraft was accepted into service in 1947.

P2V-7 Neptune of Patrol Squadron Seven (VP-7) over the Atlantic in 1954

"Truculent" Turtle

The third production P2V-1 was chosen for a record-setting mission, ostensibly to test crew endurance and long-range navigation but also for publicity purposes, to display the Navy's latest expensive plane. Loaded with fuel in extra tanks fitted in practically every spare space in the aircraft, the Turtle set out from Perth, Australia to the United States. The aircraft, invariably, seems to be called "Truculent Turtle" but, in fact, its name was simply "The Turtle"; which was painted on the aircraft's nose (along with a cartoon of a turtle smoking a pipe pedaling some device attached to a propeller). With a crew of four (and a nine month old gray kangaroo, a gift from Australia for the Washington, D.C zoo) the plane set off on September 9, 1946, with a RATO rocket-assisted takeoff. Two and a half days later, the Turtle touched down in Columbus, Ohio, 11,236.6 miles (18,083.6 km) from its starting point. It was the longest unrefuelled flight made to that point—4,000 miles (6,400 km) longer than the USAF's B-29 Superfortress record. This would stand as the absolute unrefuelled distance record until 1962, and would remain as a piston-engined record until 1986 when Dick Rutan's Voyager would break it in the process of circumnavigating the globe.

The Neptune in combat

Its combat uses included the Vietnam War, in which it was used by the US Navy as a gunship and patrol airplane, and by Argentina. In the Falklands War, it played a key role of reconnaissance and aiding Dassault Super Étendards. The lack of spare parts and their old airframes lead to the type being retired before the end of the war; Argentine Air Force C-130 Hercules took over the task of searching for targets for strike aircraft.

It was one of the first aircraft to be fitted in operational service with both piston and jet engines. The Convair B-36, several Boeing C-97 Stratofreighter, C-123 Provider, and Avro Shackleton aircraft also achieved that distinction; it leads naturally to an unusual sound during overflight.

Later use

In Australia, Canada, the Netherlands and the US Navy its tasks were taken over by the much larger and more capable P-3 Orion and by the 1970s it was only in use by US reserve units. The US Naval Reserve abandoned its last Neptunes in 1978. By the 1980s, it had fallen out of use in most purchasing nations, replaced by newer aircraft. A number still serve as fire-fighters in the United States. In Japan, the Neptune was license-built from 1966 by Kawasaki as the P-2J, with the piston engines replaced by IHI turboprops. Kawasaki continued their manufacture much later than Lockheed did; the P-2J remained in service until 1984.

P-2/P2Vs are currently employed in aerial firefighting roles by operators such as Aero Union and Neptune Aviation Services and can carry 2,400 gallons of retardant with a service life of 15,000 hours. Neptune proposes to replace them with Bombardier Q200 and Q300 aircraft which are estimated to have a service life of 80,000 hours.

Variants

Lockheed produced seven main variants of the P2V. In addition, Kawasaki built the turboprop-powered P-2J in Japan. Model names after the 1962 redesignation are given in parentheses.

[edit] United States Navy

A P2V-3C Neptune prepares to take off from the USS Midway.

Another Neptune carrier launch.

• XP2V-1 - prototype, one produced
• P2V-1 - first production model, 15 produced
• P2V-2 - 81 produced
  • P2V-2N "Polar Bear - modified Neptune with ski landing gear, one produced.
• P2V-3 - upgraded powerplant, 83 produced
  • P2V-3C - carrier-based Neptune, 11 produced
  • P2V-3B - conversions from other P2V-3 models, 16 converted
  • P2V-3W - search radar, 30 produced
  • P2V-3Z - combat transport, two produced
• P2V-4 - 52 produced
• P2V-5 (P-2E) - 424 produced
  • P2V-5F (AP-2E) - modification with J-34 jet engines
    • P2V-5FD (DP-2E) - further modification of P2V-5F with target towing or drone launch capability
    • P2V-5FE (EP-2E)
    • P2V-5FS (SP-2E)
  • OP-2E - large belly-mounted radar
• P2V-6 (P-2F) - aerial mine delivery, 83 produced
  • P2V-6M - missile launch capability, 16 produced
  • P2V-6F - modification with J-34 jet engines
  • P2V-6T - trainer version
• P2V-7 (P-2H) - last Neptune variant produced by Lockheed, 311 produced
  • P2V-7S
  • P2V-7LP - ski landing gear
  • AP-2H
  
  

  United States Air Force

• RB-69A - aerial reconnaissance, seven produced

Japan Maritime Self Defense Force

• P2V-kai - Japanese variant produced by Kawasaki with turboprop engines, 82 produced

Units using the Neptune

Royal Canadian Air Force

• No. 404 Squadron RCAF

Specifications (P2V)

General characteristics

• Crew: 7-9
• Length: 91 ft 8 in (27.9 m)
• Wingspan: 101 ft 4 in (30.9 m)
• Height: 29 ft 4 in (8.9 m)
• Wing area: 1,000 ft² (93 m²)
• Empty weight: 49,548 lb (22,475 kg)
• Loaded weight: 73,139 lb (33,175 kg)
• Max takeoff weight: 79,895 lb (36,240 kg)
• Powerplant:
  • 2× Westinghouse J34-WE-36 turbojets, 3,400 lbf (15 kN) each
  • 2× Wright R-3350-32W Cyclone Turbo-compound radial engines, 3,700 hp (2,800 kW) each
  
  

  Performance

• Maximum speed: 403 mph (649 km/h)
• Range:
  
• Combat: 2,200 mi (3,500 km)
• Ferry: 4,350 mi (7,000 km)
• Service ceiling: 22,000 ft (6,700 m)
• Rate of climb: 1,760 ft/min (9 m/s)
• Wing loading: 73 lb/ft² (360 kg/m²)

Armament

• Rockets: 2.75" FFAR in removable wing-mounted pods
• Bombs: 10,000 lb (4,500 kg) including free-fall bombs, depth charges, and torpedoes

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