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Kawasaki P-2J Neptune

Anti-Submarine Warfare / Maritime Patrol Aircraft

Kawasaki P-2J Neptune

Anti-Submarine Warfare / Maritime Patrol Aircraft

OVERVIEW
SPECIFICATIONS
ARMAMENT
VARIANTS
HISTORY
MEDIA
OVERVIEW



The Kawasaki P-2J Neptune made up the last remaining production batch of the American Lockheed Neptune maritime patrol line.
National Flag Graphic
ORIGIN: Japan
YEAR: 1969
MANUFACTURER(S): Kawasaki - Japan / Lockheed Martin - USA
PRODUCTION: 83
OPERATORS: Japan
SPECIFICATIONS



Unless otherwise noted the presented statistics below pertain to the Kawasaki P-2J Neptune model. Common measurements, and their respective conversions, are shown when possible.
CREW: 10
LENGTH: 95.90 feet (29.23 meters)
WIDTH: 101.28 feet (30.87 meters)
HEIGHT: 29.30 feet (8.93 meters)
WEIGHT (EMPTY): 42,505 pounds (19,280 kilograms)
WEIGHT (MTOW): 75,001 pounds (34,020 kilograms)
ENGINE: 2 x IHI (General Electric) T64-10 turboprop engines developing 2,850 horsepower each with 2 x Ishikawajima-Harima J3-IHI-7C turbojet engines developing 3,085 lb of thrust each.
SPEED (MAX): 404 miles-per-hour (650 kilometers-per-hour; 351 knots)
RANGE: 2,762 miles (4,445 kilometers; 2,400 nautical miles)
CEILING: 30,020 feet (9,150 meters; 5.69 miles)
RATE-OF-CLIMB: 1,800 feet-per-minute (549 meters-per-minute)




ARMAMENT



OPTIONAL:
Up to 8,000 lb of torpedoes, depth charges, rockets, or conventional drop bombs.
VARIANTS



Series Model Variants
• P-2J - Base Series Designation
• P2V-Kai - Original product designation
• EP-2J - ELINT models converted from P-2J; two examples.
• UP-2J - Drone support platform; four examples converted from P-2J stock.


HISTORY



Detailing the development and operational history of the Kawasaki P-2J Neptune Anti-Submarine Warfare / Maritime Patrol Aircraft.  Entry last updated on 7/13/2016. Authored by Staff Writer. Content ©www.MilitaryFactory.com.
In 1961, work began on a new maritime patrol platform for the nation of Japan. Instead of heavily investing in the more modern, but cost prohibitive, Lockheed P-3 "Orion" being offered by the Americans, it was decided to develop a turboprop-powered version of the Lockheed P-2 "Neptune" with slight changes implemented to suit the Japanese requirement. The aircraft would serve the Japanese Maritime Self-Defense Force (JMSDF) from introduction in 1969 until retirement in 1996. Production yielded 83 examples from the period spanning 1966 to 1979.

A P-2H (P2V-7) airframe was used for the modification and a first flight of a prototype was recorded on July 21st, 1966. Since local Japanese industry was already engaged in license-production of the General Electric T64-10 series turboprop engine, replacing the Neptune's radial installations to the new engines was made easier. Each unit outputted at 2,850 horsepower and drove four-bladed propeller systems. Beyond the conventional powerplants, the new Japanese version of the aircraft was outfitted with J3-IHI-7C series turbojets for improved performance and avionics were all-modern. The changes produced an aircraft that was slightly longer than the original USN entry with greater surface area at the tailplanes and more internal volume for more fuel.

The aircraft was adopted by the JMSDF as the P-2J "Neptune". Despite the listed changes, the origins to the aircraft were readily apparent: the fuselage retained its slim profile and slab-sided approach. The flight deck sat behind and over the nose, both sections glazed over for good vision out-of-the-aircraft. Wings were mid-mounted monoplanes and each held an engine nacelle along the leading edge. The wings also showcased a noticeable amount of dihedral (upward angle) with tips carrying mission-pertinent equipment. Pods were also affixed under each wing just outboard of each engine nacelle. A ventral blister along the forward section of the fuselage housed a radome. The tail unit was conventional with its single vertical tail fin and low-set horizontal planes. The undercarriage utilized a three-point stance and was wholly retractable.

Original in-service models were known simply as "P-2J" and this constituted the sole prototype example and a further 82 "new-build" aircraft. Two of this stock were then converted for the ELectronic INTelligence (ELINT) role under the "EP-2J" designation. "UP-2J" represented four P-2J airframes converted to serve various drone-related functions.

The P-2J units served until its technological capabilities had finally been surpassed for JMSDF tastes which led to the service eventually ordered a fleet of Lockheed P-3C "Orion" aircraft anyway. The P-2J line was reduced in number gradually throughout the 1980s with the last not given up until 1993.




MEDIA







Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.

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Relative Maximum Speed Rating
Hi: 500mph
Lo: 250mph
    This entry's maximum listed speed (404mph).

    Graph average of 375 miles-per-hour.
City-to-City Ranges
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  BER
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  SYD
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  NYC
Graph showcases the Kawasaki P-2J Neptune's operational range (on internal fuel) when compared to distances between major cities.
Aviation Era
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Pie graph section
Pie graph section
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Pie graph section
Useful in showcasing the era cross-over of particular aircraft/aerospace designs.
Unit Production Comparison
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units
83
83

  * Commercial Market High belongs to Cessna 172.

  ** Military Market High belongs to Ilyushin Il-2.


Altitude Visualization
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Supported Roles
A2A
Interception
UAV
Ground Attack
CAS
Training
ASW
Anti-Ship
AEW
MEDEVAC
EW
Maritime/Navy
SAR
Aerial Tanker
Utility/Transport
VIP
Passenger
Business
Recon
SPECOPS
X-Plane/Development
A2A=Air-to-Air; UAV=Unmanned; CAS=Close Support; ASW=Anti-Submarine; AEW=Airborne Early Warning; MEDEVAC=Medical Evac; EW=Electronic Warfare; SAR=Search-Rescue