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    Lockheed P2V Neptune Anti-Submarine Warfare / Maritime Patrol Aircraft

    The Lockheed P2V Neptune series was an exceptional aircraft in service with the United States Navy and Air Force during the Cold War years.

     Updated: 10/7/2015; Authored By Staff Writer; Content ¬©www.MilitaryFactory.com

    The P2V Neptune series of aircraft was one of the more successful post-war designs for America, with service that spanned decades for a handful of American-friendly countries. The system was designed by Lockheed Corporation from the outset as a land-based maritime patrol and reconnaissance platform. The system proved so versatile and effective, that the base production model spawned a large series of variants in specialized roles.

    The P2V Neptune was a twin engine high-wing monoplane design. Sporting various Wright-brand powerplants throughout its production run, the aircraft featured outstanding range. A most identifiable feature being the single large rudder on the empennage, though the overall gangly design of the nose was another memorable feature. The Neptune split time between the United States Navy and the United States Air Force, though it is widely remembered for its service with the Navy branch.

    The Neptune got its start as early as 1944, where two XP2V-1 prototypes are delivered with 15 production P2V-1 models. Initial models featured an impressive armament of cannons and heavy caliber machine guns of which 6 x 20mm cannons were mounted in a battery in the nose while 2 x 20mm cannon sat in a tail turret. 2 x 12.7mm machine guns are also part of the early arsenal though many of these weapons were later removed as needs for the platform changed. Internally, the Neptune was geared for military success with specialized equipment and anti-surface vessel weaponry. Chief among these weapons were the ability to carry torpedoes, mines, bombs of various weights and even externally-held high-explosive rockets (underwing).

    Aircraft personnel amounted to ten in most versions. The P2V-2 was the first to do away with the nose turret armament, and instead, extended the nose assembly. The P2V-2S was an anti-submarine specialized variant while the P2V-2-2N was a cold weather derivative that was fielded with skis. The P2V-3 series brought about an early warning variant while the P2V-4 saw new and improved turbo-compound engines installed along with wingtip tanks and an APS-20 radar as standard. The P2V-5 was the first model offered up for export while the P2V-6 saw a revision to the series' defensive armament. The P2V-7 proved to be the ultimate incarnation for the P2V series featuring the MAD boom installation in place of the rear tail turret. This variant proved to be the final production variant and saw many -5's and -6's brought up to this standard. Designation of the system was then changed to SP-2H after 1962.

    The United States Air Force maintained the Neptune as the RB-69A while other designations existed for specialized Southeast Asia-operating systems. The Neptune was also license-produced in Japan. Over 75% of all produced Neptunes went into service with the United States Navy and would later be replaced by another Lockheed product - the P-3 - throughout the 1970's. relegating the P2V series to supporting roles until complete withdrawal from active service.

    One of the more well known Neptune aircraft remains the P2V-1 Neptune known as the "Truculent Turtle" which set a world's distance record in 1946 by flying non-stop from Australia to Ohio (Columbus). The distance for this specially-modified aircraft covered some 11,236 miles.

    Lockheed P2V-4 Neptune Technical Specifications

    Service Year: 1947
    Type: Anti-Submarine Warfare / Maritime Patrol Aircraft
    National Origin: United States
    Manufacturer(s): Lockheed - USA
    Production Total: 1,036

    Structural (Crew Space, Dimensions and Weights)

    Operating Crew: 7
    Length: 77.00 feet (23.47 meters)
    Width: 100.00 feet (30.48 meters)
    Height: 27.99 feet (8.53 meters)

    Weight (Empty): 41,548 lb (18,846 kg)
    Weight (MTOW): 79,999 lb (36,287 kg)

    Installed Power and Standard Day Performance

    Engine(s): 2 x Wright R-3350-30W superchargered piston engines developing 3,250 horsepower each.

    Maximum Speed: 314 mph (505 kph; 273 knots)
    Maximum Range: 2,807 miles (4,518 km)
    Service Ceiling: 24,698 feet (7,528 meters; 4.68 miles)
    Rate-of-Climb: 1,100 feet-per-minute (335 m/min)

    Armament / Mission Payload

    6 x 20mm M-24 cannons in nose
    2 x 12.7mm machine guns (on deck)
    2 x 20mm M-24 cannons in tail

    Mission-Specific Armament can include the following (all ordnance held in internal bay unless noted). Maximum bombload capacity of 4,800 lbs:

    6 x 100lb bombs
    6 x 500lb bombs
    4 x 1,000lb bombs
    2 x 2,000lb mines
    2 x 1,600lb bombs
    4 x Mk 24 mines
    4 x Mk 34 mines
    4 x 1,200lb torpedoes
    2 x A.R. 11.75 inch
    16 x HVAR 5 inch rockets (underwing)

    Global Operators / Customers

    Australia; Canada; France; Japan; Netherlands; Portugal; United Kingdom; United States

    Model Variants (Including Prototypes)

    XP2V-1 - Prototype Model Designation of which two examples were ordered in 1944.

    P2V-1 - Initial Production Model Designation

    P2V-2 - Sans nose turret; extended nose assembly.

    P2V-2S - Specialized ASW Variant

    P2V-2-2N - Specialized Arctic Variant with skis.

    P2V-3 - Improved engines.

    P2V-3C - Specialized Carrier Variant

    P2V-3Z - Command Transport Variant

    P2V-3W - Early Warning Radar Search Variant

    P2V-4 - Fitted with turbo-compound R-3350 engines; standard APS-20 radar; wingtip fuel tanks.

    P2V-5 - First version offered for export

    P2V-6 - Reduced capability radar; improved defensive armament positions.

    P2V-7 - "Ultimate Neptune"; fitted with Westinghouse J-34 wingtip pods; tail turret replaced by MAD boom system; sans nose armament altogether; redesign cockpit; designation later changed to SP-2H; Many P2V-5's and P2V-6's retrofitted in this way; final production version.

    SP-2H - New Designation replacing previous P2V designations; all defensive guns were now removed from the design.

    RB-69A - Conversion Variants for USAF usage.

    OP-2E - Specialized Variant for Southeast Asia usage.

    AP-2H - Specialized Variant for Southeast Asia usage.

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