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P-2 (P2V) Neptune
P2V-7 Neptune of Patrol Squadron Seven (VP-7) over the Atlantic in 1954
Type	Maritime Patrol and Anti-Submarine Warfare
Manufacturer	Lockheed
Maiden flight	17 May 1945
Introduced	March 1947
Retired	1978
Primary users	United States Navy Republic of China Air Force

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 several armed forces. The Neptune shares the P-2 designation (albeit under a different designation system) with the Curtiss P-2 Hawk, a much earlier biplane.

Contents 1 Design and development 2 Operational history 2.1 "Truculent" Turtle 3 Variants 4 Operators 5 Specifications (P2V) 6 References 7 External links 8 Related content

Development began early in World War II, but in comparison to other aircraft in development at the time it was considered a low priority. So it was not until 1944 that the program went into full swing. 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.

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.

Vietnam War

During Vietnam War the Neptune was used by the US Navy as a gunship and patrol airplane. The Neptune was also utilized by the U.S. Army's 1st Radio Research Company (Aviation) located at Cam Ranh Bay.

Falklands War

The Argentine Navy had received at least 16 Neptunes in different variants since 1958 including 8 ex-RAF for use in the Escuadrilla Aeronaval de Exploración (English: Naval exploration squadron). They were intensively used in 1978 during the Beagle crisis with Chile including over the Pacific Ocean.^[1]

During the Falklands War (Spanish: Guerra de las Malvinas) in 1982, the last two airframes in service (2-P-111 and 2-P-112) played a key role of reconnaissance and aiding Dassault Super Étendards, particularly on the May 4 attack against HMS Sheffield. The lack of spare parts, caused by the US having enacted an arms embargo in 1977 due to the Dirty War, led 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.

In 1983 the unit was reformed with Lockheed L-188 Electras modified for maritime surveillance and in 1994 these ones were replaced with P-3B Orions.

Other military operators

In Australia, 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. In Canada its tasks were taken over by the CP-107 Argus followed by the CP-140 Aurora. 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.

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.

Civilian use

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.

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 unrefueled distance record until 1962 (beaten by a USAF B-52 Stratofortress), 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.

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.

XP2V-1

Prototype, one produced.

P2V-1

First production model, 15 built.

P2V-2

Second production model, 81 built.

P2V-2N "Polar Bear"

Modified Neptune with ski landing gear and early MAD gear, 1 built.

P2V-3

Upgraded powerplant, 83 built.

P2V-3C

Carrier-based Neptune, 11 built.

P2V-3B

Conversions from other P2V-3 models, including P2V-3C and -3W, fitted with the ASB-1 Low Level Radar Bombing System, 16 converted.

P2V-3W

Airborne Early Warning variant, APS-20 search radar, 30 built.

P2V-3Z

VIP combat transport, 2 built.

P2V-4 (P-2D)

Upgraded powerplant and fuel capacity, 52 built.

P2V-5 (P-2E)

Replaced solid nose with turret, APS-20 and APS-8 search radars standard, jettisonable wingtip fuel tanks. Late models featured solid nose and MAD gear in place of nose and tail turrets, 424 built.

P2V-5F

Modification with J-34 jet engines, deleted wing rocket stubs, increased bombload.

AP-2E

Designation applied to P2V-5F with special SIGINT/ELINT equipment used by the US Army's 1st Radio Research Company at Cam Ranh Bay.

P2V-5FD (DP-2E)

P2V-5F with target towing or drone launch capability, various defensive equipment and all weaponry deleted.

P2V-5FE (EP-2E)

P2V-5F with additional electronic equipment.

P2V-5FS (SP-2E)

P2V-5F with Julie/Jezebel ASW gear.

OP-2E

Modified for use as part of Operation Igloo White, only 12 converted.

P2V-6 (P-2F)

Aerial mine delivery capability, APS-70 search radar, upgraded powerplant, 83 built.

P2V-6B

AUM-N-2 Petrel missile launch capability.

P2V-6M (MP-2F)

Formerly P2V-6B, 16 produced; note that originally the M mission modifier prefix stood for missile carrier, but was eventually dropped, becoming the role-modifier for multi-mission aircraft.

P2V-6F (P-2G)

P2V-6/P-2F refitted with J-34 jet engines.

P2V-6T (TP-2F)

Trainer version with armament deleted, wingtip tanks often deleted.

P2V-7 (P-2H)

Last Neptune variant produced by Lockheed, upgraded powerplant, jet pods standard, improved wingtip tanks, APS-20 search radar, early fitted with nose and tail turrets, but replaced with observation nose and MAD tail, dorsal turret also fitted early and replaced with observation bubble, 311 built.

P2V-7LP (LP-2J)

Ski landing gear, JATO provisions, 4 built.

P2V-7S (SP-2H)

Additional ASW/ECM equipment including Julie/Jezebel gear.

P2V-7U

Naval designation of the RB-69A variant.

AP-2H

Specialized gunship variant, only 4 converted.

RB-69A

Aerial reconnaissance, fitted with Side Looking Airborne Radar (SLAR) equipment, possibly transferred to Taiwan after leaving USAF service, 7 built.

Neptune MR.1

British designation of P2V-5, 52 delivered.

CP-122 Neptune

RCAF designation of P2V-7.^[2]

P2V-Kai (P-2J)

Japanese variant produced by Kawasaki with turboprop engines, J-34 engine pods replaced by pods with similar license produced IHI-J3 engines, improved ASW/ECM gear, APS-80 search radar standard, increased fuel capacity, various other improvements, "Kai" short for "Kaizo" meaning modified, 82 built.

 Argentina

• Argentine Navy
  • Escuadrilla Aeronaval de Exploracion^[3]

 Australia

• Royal Australian Air Force
  • No. 10 Squadron RAAF
  • No. 11 Squadron RAAF

 Brazil

 Canada

• Royal Canadian Air Force
  • No. 404 Squadron RCAF
  • No. 405 Squadron RCAF
  • No. 407 Squadron RCAF

 Chile

 France

• Aviation Navale

 Japan

• Japan Maritime Self Defense Force

 Netherlands

 Portugal

 Republic of China

• Republic of China Air Force
  • 34th Black Bats Squadron

 United Kingdom

• Royal Air Force
  • No. 36 Squadron RAF
  • No. 203 Squadron RAF
  • No. 210 Squadron RAF
  • No. 217 Squadron RAF

 United States

• United States Air Force operated 7 RB-69A during Vietnam War.
• United States Navy
• Aero Union
• Minden Air
• Neptune Aviation Services

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

• Sullivan, Jim, P2V Neptune in action. Squadron/Signal Publications: Carrollton, TX, 1985.

• http://p2vneptune.com
• http://www.maam.org/neptune/p2_1.html
• http://frenchnavy.free.fr/aircraft/neptune/neptune.htm
• http://www.vpnavy.com/aircraft_p2_history.html
• http://www.vpnavy.com/turtle_01.html
• http://www.aerounion.com
• Missoulian article on Neptune's P2V water bombers and their proposed replacement with Q300s
• Listing of the carrier launch conversions
• http://www.VO-67.org Observation Squadron Sixty-Seven

Comparable aircraft

• Avro Shackleton
• PB4Y-2 Privateer
• P4M Mercator

Designation sequence

• Navy sequence: PV - P2V - P3V

Air Force sequence: B-66 - GAM-67 -	XB-68	-		-		-
	SM-68 I		RB-69		XB-70		SR-71
	SM-68 II		IM-69		IM-70		GAM-71 - XGAM-72

• Unified sequence: P-2 - P-3 - P-4 - P-5

Related lists

• List of Lockheed aircraft
• List of military aircraft of the United States
• List of patrol aircraft

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