Lockheed P2V Neptune - version overview:
XP2V-1 - prototype twin-engine maritime patrol aircraft; 2 units
P2V-1 - first production version, R-3350-8A engines; 15 units
P2V-2 - R-3350-24W engines and new nose; 81 pcs
P2V-2N - unarmed machines fitted with retractable skid landing gear, 2 pcs
P2V-2S - machine modified to be an anti-submarine prototype
P2V-3 - R-3350-26W engines, 53 units
P2V-3B - several P2V-3Cs and P2V-3Ws modified for low-altitude bombing
P2V-3W - early warning aircraft with APS-20 radar, 30 pcs
P2V-3Z - passenger transport, 2 pcs
P2V-4 - R-3350-30W engines, APS-20 radar, 52 pcs
P2V-5 - forward turret, new auxiliary tanks; later machines had forward turret replaced by glass nose and rear MAD detector; 434 pcs
P2V-5F - conversion with J-34 auxiliary engines, converted most P2V-5
P2V-5FD - conversion of about 9 unmanned vehicle control vehicles
P2V-5FE - conversion with additional electronic equipment
P2V-5FS - conversion with additional submarine detection equipment
P2V-6 - extended bomb bay and increased fuel supply
P2V-6B - 16 machines capable of carrying two Petrel anti-ship missiles
P2V-6M - renamed P2V-6B
P2V-6F - conversion with J-34 auxiliary engines
P2V-6T - several machines modified for crew training
P2V-7 - R-3350-32W engines, from the beginning auxiliary J-34 engines
P2V-7B - 15 machines for the Netherlands with cannons in the nose, soon converted to SP-2H
P2V-7LP - unarmed machines equipped with retractable ski chassis, 4 pcs
P2V-7S - conversion with additional submarine detection equipment
P2V-7U - Navy designation for RB-69A
P2V-7Kai - Japanese conversion with turboprop engines, 2 units
P-2D - P2V-4 designation after 1962
P-2E - P2V-5F designation after 1962
AP-2E - 6 P2V-5Fs converted by the Army for electronic data collection
OP-2E - Army conversion for sensor deployment on the Ho Chi Minh Trail, 12 units
RP-2E - at least one P-2E used by the Army in Vietnam
DP-2E - P2V-5FD designation after 1962
EP-2E - P2V-5FE designation after 1962
SP-2E - P2V-5FS designation after 1962
P-2F - P2V-6 designation after 1962
MP-2F - P2V-6M designation after 1962
TP-2F - P2V-6T designation after 1962
P-2G - P2V-6F designation after 1962
P-2H - P2V-7 designation after 1962
AP-2H - night-fighting conversion with two miniguns and a 40mm grenade launcher, 4 pcs
DP-2H - P-2H conversion for controlling unmanned aerial vehicles
EP-2H - P-2H repeater conversion
SP-2H - P2V-7S designation after 1962
P-2J - Japanese serial variant of the P2V-7 Kai
LP-2J - P2V-7LP designation after 1962
UP-2J - Japanese conversion of the P-2J for radio electronic training, 6 pcs
EP-2J - Japanese conversion of the UP-2J for electronic data collection, 2 pcs
RB-69A - stands ordered by the Navy as P2V-7U for the Air Force, intended for radio-electronic reconnaissance
Neptune MR Mk.1 - the designation of the P2V-5 by the RAF
CP-122 Neptune- the designation of the Canadian P2V-7
Source:
www.personal.psu.edu
http://www.aerofiles.com/_lock2.html
http://en.wikipedia.org/wiki/P-2_Neptune#Variants
XP2V-1 - prototype twin-engine maritime patrol aircraft; 2 units
P2V-1 - first production version, R-3350-8A engines; 15 units
P2V-2 - R-3350-24W engines and new nose; 81 pcs
P2V-2N - unarmed machines fitted with retractable skid landing gear, 2 pcs
P2V-2S - machine modified to be an anti-submarine prototype
P2V-3 - R-3350-26W engines, 53 units
P2V-3B - several P2V-3Cs and P2V-3Ws modified for low-altitude bombing
P2V-3W - early warning aircraft with APS-20 radar, 30 pcs
P2V-3Z - passenger transport, 2 pcs
P2V-4 - R-3350-30W engines, APS-20 radar, 52 pcs
P2V-5 - forward turret, new auxiliary tanks; later machines had forward turret replaced by glass nose and rear MAD detector; 434 pcs
P2V-5F - conversion with J-34 auxiliary engines, converted most P2V-5
P2V-5FD - conversion of about 9 unmanned vehicle control vehicles
P2V-5FE - conversion with additional electronic equipment
P2V-5FS - conversion with additional submarine detection equipment
P2V-6 - extended bomb bay and increased fuel supply
P2V-6B - 16 machines capable of carrying two Petrel anti-ship missiles
P2V-6M - renamed P2V-6B
P2V-6F - conversion with J-34 auxiliary engines
P2V-6T - several machines modified for crew training
P2V-7 - R-3350-32W engines, from the beginning auxiliary J-34 engines
P2V-7B - 15 machines for the Netherlands with cannons in the nose, soon converted to SP-2H
P2V-7LP - unarmed machines equipped with retractable ski chassis, 4 pcs
P2V-7S - conversion with additional submarine detection equipment
P2V-7U - Navy designation for RB-69A
P2V-7Kai - Japanese conversion with turboprop engines, 2 units
P-2D - P2V-4 designation after 1962
P-2E - P2V-5F designation after 1962
AP-2E - 6 P2V-5Fs converted by the Army for electronic data collection
OP-2E - Army conversion for sensor deployment on the Ho Chi Minh Trail, 12 units
RP-2E - at least one P-2E used by the Army in Vietnam
DP-2E - P2V-5FD designation after 1962
EP-2E - P2V-5FE designation after 1962
SP-2E - P2V-5FS designation after 1962
P-2F - P2V-6 designation after 1962
MP-2F - P2V-6M designation after 1962
TP-2F - P2V-6T designation after 1962
P-2G - P2V-6F designation after 1962
P-2H - P2V-7 designation after 1962
AP-2H - night-fighting conversion with two miniguns and a 40mm grenade launcher, 4 pcs
DP-2H - P-2H conversion for controlling unmanned aerial vehicles
EP-2H - P-2H repeater conversion
SP-2H - P2V-7S designation after 1962
P-2J - Japanese serial variant of the P2V-7 Kai
LP-2J - P2V-7LP designation after 1962
UP-2J - Japanese conversion of the P-2J for radio electronic training, 6 pcs
EP-2J - Japanese conversion of the UP-2J for electronic data collection, 2 pcs
RB-69A - stands ordered by the Navy as P2V-7U for the Air Force, intended for radio-electronic reconnaissance
Neptune MR Mk.1 - the designation of the P2V-5 by the RAF
CP-122 Neptune- the designation of the Canadian P2V-7
Source:
www.personal.psu.edu
http://www.aerofiles.com/_lock2.html
http://en.wikipedia.org/wiki/P-2_Neptune#Variants