page_title: List of Lockheed Constellation variants
section_title: Military designations
hierarchical_section_title: List of Lockheed Constellation variants / Military designations
caption_attribution_description: A U.S. Navy Lockheed NC-121J (BuNo 131627) Blue Eagle I of the OASU (Oceanographic Air Survey Unit, later air development squadron VX-8) landing in 1965. Two "Blue Eagle" aircraft were based at Tan Son Nhut Air Base near Saigon, South Vietnam, and broadcasted radio programmes of the American Forces Vietnam Network from 1965 to 1970 (called "Project Jenny"). 131627 has still three antenna masts on this picture. The center mast was removed prior to the deployment to Vietnam because of flight stability problems.
context_page_description: The Lockheed Constellation was an American civil airliner and military transport built in the 1940s and 1950s; this is a list of its variants.
context_section_description: XB-30
  Bomber version of the C-69. Was given model designation L-051 and later L-249.
  XC-69
  Designation for the prototype Constellation. One built. The C-69 was the original military transport version for the USAAF. All aircraft built during World War II were pressed into military service under this designation.
  C-69
  Original troop transport version. Almost all of this type were converted into L-049 airliners. 22 were built.
  C-69A
  Proposed long range troop version of the C-69.
  C-69B
  Proposed long range troop version of the C-69 designed to carry B-29 Superfortress engines to China. Was given model designation L-349.
  C-69C-1
  VIP transport aircraft, later designated ZC-69C-1. Only one aircraft was produced. Was given model designation L-549.
  C-69D
  Proposed VIP transport version.
  XC-69E
  Prototype XC-69 converted into an engine testbed. It was powered by 4 Pratt & Whitney R-2800 Double Wasp engines.
  C-121A
  The C-121 was the military transport version of improved L-749 introduced in 1948. Reinforced floor, cargo door in port rear fuselage
  VC-121A
  VIP transport aircraft, converted from the C-121A
  VC-121B
  VIP transport for use by the President of the United States of America
  C-121C
  R7V-1 with R-3350-34 engines with 3,400 hp (2,536 kW) each, based on L-1049
  JC-121C
  Two C-121C and one TC-121C used as avionics testbeds
  NC-121C
  One C-121C converted for permanent use as a testbed
  RC-121C
  USAF long-range airborne radar analogous to Navy's WV-2
  TC-121C
  Nine RC-121Cs Converted as AEW trainers, subsequently became EC-121C
  VC-121C
  VIP version of C-121C. Total 4.
  EC-121D
  Big Eye/College Eye/Disco early warning variant,  originally designated RC-121D
  NC-121D
  WV-2 converted to observe high speed objects in the atmosphere nicknamed the "Tripple Nipple"
  RC-121D
  WV-2 with wingtip fuel tanks, later redesignated EC-121D
  VC-121E
  VIP transport for use by the President of the United States of America
  YC-121F
  Two prototype R7V-1 with Pratt & Whitney T34-P-6 turboprops with 6,000 shp (4,476 kW) each
  C-121G
  32 Navy R7V-1 delivered to USAF
  TC-121G
  Designation given to 9 C-121G converted into trainers
  VC-121G
  One C-121G given the role as a temporary VIP Transport
  EC-121H
  42 EC-121D with upgraded electronics
  C-121J
  Redesignated Navy R7V-1
  EC-121J
  2 EC-121D with upgraded electronics
  NC-121J
  7 C-121J modified to send television broadcasts to troops in Vietnam
  VC-121J
  4 C-121J converted for VIP use. One served with the Blue Angels.
  EC-121K
  Redesignated Navy WV-2 Warning Star
  JC-121K
  One EC-121K used as an avionics testbed
  NC-121K
  EC-121K used by the Navy
  EC-121L
  Redesignated Navy WV-2E
  EC-121M
  Redesignated Navy WV-2Q
  WQC-121N
  Redesignated Navy WV-3
  EC-121P
  EC-121K equipped for anti-submarine warfare
  EC-121Q
  EC-121D with upgraded electronics
  EC-121R "BatCat"
  EC-121K and EC-121P equipped to process signals from seismic instruments
  NC-121S
  Electronic warfare and reconnaissance version
  EC-121T
  Upgraded radar; One example is on display at Peterson Air and Space Museum, EC-121T photo.
  R7O-1
  The original US Navy designation of the R7V-1 based on L-1049D, R-3350-91 engines with 3,250 hp (2,425 kW) each
  R7V-1
  Re-designation of the R7O-1. Later redesignated C-121J
  R7V-1P
  One R7V-1 modified for Arctic use
  R7V-2
  Four prototypes with Pratt & Whitney YT34-P-12A turboprops of 4,140 shp (3,088 kW) each. Two were delivered as YC-121F prototype aircraft (see above).
  PO-1W
  Two maritime patrol aircraft equipped with search radar based on L-749, later re-designated WV-1.
  PO-2W Warning Star
  Long-range airborne radar aircraft, R-3350-34 or R-3350-42 engines with 3,400 hp (2,536 kW) each, based on L-1049, later re-designated WV-2.
  WV-1
  Re-designation of the PO-1W.
  WV-2 Warning Star
  Re-designation of the PO-2W. Later re-designated EC-121K.
  WV-2E
  Experimental version of WV-2 modified to carry a rotating radar dome similar to that of the Boeing E-3 Sentry. Later redesignated EC-121L.
  WV-2Q
  WV-2 equipped for electronic warfare, later redesignated EC-121M.
  WV-3
  Eight aircraft equipped for weather reconnaissance. Later re-designated WQC-121N.
  XW2V-1
  The XW2V-1 was a planned radar version
caption: An NC-121J used in Vietnam.
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