Lockheed P-2 Neptune

https://en.wikipedia.org/wiki/Lockheed_P-2_Neptune

The Lockheed P-2 Neptune (designated P2V by the United States Navy prior to
September 1962) was a Maritime patrol and anti-submarine warfare (ASW) aircraft.
It was developed for the US Navy by Lockheed to replace the Lockheed PV-1
Ventura and PV-2 Harpoon, and was replaced in turn by the Lockheed P-3 Orion.
Designed as a land-based aircraft, the Neptune never made a carrier landing,
although a small number of aircraft were converted and deployed as
carrier-launched, stop-gap nuclear bombers which would have to ditch or recover
at land bases. The type was successful in export and saw service with several
armed forces.

Beginning with the P2V-5F model, the Neptune became one of the first aircraft in
operational service to be fitted with both piston and jet engines. The Convair
B-36, several Boeing C-97 Stratofreighter, Fairchild C-123 Provider, and Avro
Shackleton aircraft were also so equipped. To save weight and complexity of two
separate fuel systems, the Westinghouse J34 jet engines on P2Vs burned the
115–145 Avgas fuel of the piston engines, instead of jet fuel. The jet pods were
fitted with intake doors that remained closed when the J-34s were not running.
This prevented windmilling, allowing for economical piston-engine-only
long-endurance search and patrol operations. In normal US Navy operations, the
jet engines were run at full power (97%) to assure takeoff, then shut down upon
reaching a safe altitude. The jets were also started and kept running at flight
idle during low-altitude (500-foot (150 m) during the day and 1,000-foot (300 m)
at night) anti-submarine and/or anti-shipping operations as a safety measure
should one of the radials develop problems.

Normal crew access was via a ladder on the aft bulkhead of the nosewheel well to
a hatch on the left side of the wheel well, then forward to the observer nose,
or up through another hatch to the main deck. There was also a hatch in the
floor of the aft fuselage, near the sonobuoy chutes.


Role
Maritime Patrol and Anti-Submarine Warfare

National origin
United States

Manufacturer
Lockheed

First flight
17 May 1945

Introduction
March 1947

Retired
1984 From military use

Primary users
United States Navy
Japan Maritime Self Defense Force
Royal Australian Air Force
Royal Canadian Air Force

Variants
Kawasaki P-2J

During the Vietnam War, the Neptune was used by the US Navy as a gunship, an
overland reconnaissance and sensor deployment aircraft, and in its traditional
role as a maritime patrol aircraft. The Neptune was also utilized by the US
Army's 1st Radio Research Company (Aviation), call sign "Crazy Cat", based at
Cam Ranh Air Base in South Vietnam, as an electronic "ferret" aircraft
intercepting low-powered tactical voice and morse code radio signals. The US
Army operated the P-2 from 1967 until 1972, flying 42,500 hours with no
accidents. Observation Squadron 67 (VO-67), call sign "Lindy", was the only P-2
Neptune aircraft squadron to ever receive the Presidential Unit Citation, flying
Igloo White missions sowing seismic and acoustic sensors over the Ho Chi Minh
Trail.

P-2/P2Vs have been employed in aerial firefighting roles by operators such as
Minden Air Corp and Neptune Aviation Services. The fire fighters can carry 2,080
gal (7,874 l) of retardant and have a service life of 15,000 hours. Neptune
proposes to replace them with British Aerospace 146 aircraft which are estimated
to have a service life of 80,000 hours and carry upwards of 3,000 gallons of
retardant.

Specifications

P2V-3

General characteristics
Crew: 9-11
Length: 77 ft 10 in (23.72 m)
Wingspan: 100 ft 0 in (30.48 m)
Height: 28 ft 4 in (8.56 m)
Wing area: 1,000 ft² (92.9 m²)
Empty weight: 34,875 lb (15,819 kg)
Max. takeoff weight: 64,100 lb (29,076 kg)
Powerplant: 2 × Wright R-3350-26W Cyclone-18 radial engine, 3,200 hp (2,386 kW)
wet each
Propellers: 4 bladed propeller, 1 per engine

Performance
Maximum speed: 278 kn (313 mph) (515 km/h)
Cruise speed: 155 kn (174 mph) (286 km/h) (max)
Range: 3,458 nmi (3,903 mi) (6,406 km)

Armament

Rockets: 2.75 in (70 mm) FFAR in removable wing-mounted pods
Bombs: 8,000 lb (3,629 kg) including free-fall bombs, depth charges, and
torpedoes


P-2H (P2V-7)

General characteristics
Crew: 7–9
Length: 91 ft 8 in (27.94 m)
Wingspan: 103 ft 10 in (31.65 m)
Height: 29 ft 4 in (8.94 m)
Wing area: 1,000 ft² (92.9 m²)
Empty weight: 49,935 lb (22,650 kg)
Max. takeoff weight: 79,895 lb (35,240 kg)
Powerplant: 2 × Westinghouse J34-WE-34 turbojet, 3,400 lbf (15.1 kN) each
2 × Wright R-3350-32W Cyclone Turbo-compound radial engine, 3,700 hp (2,759 kW)
wet each Propellers: 4 bladed propeller, 1 per engine



Performance
Maximum speed: 316 kn (363 mp/h) (586 km/h) (all engines)
Cruise speed: 180 kn (207 mp/h) (333 km/h) (max)
Range: 1,912 nmi (2,157 mi) (3,540 km)
Service ceiling: 22,400 ft (6,827 m)

Armament

Rockets: 2.75 in (70 mm) FFAR in removable wing-mounted pods
Bombs: 8,000 lb (3,629 kg) including free-fall bombs, depth charges, and
torpedoes




*