/ Lockheed EC-121 Warning Star
Lockheed EC-121 Warning Star
The Lockheed EC-121 Warning Star was an American Airborne early warning and control radar surveillance aircraft operational in the 1950s in both the United States Navy and United States Air Force.
2 prototypes, L-749A Constellation, designated PO-1W before 1952
Main USN variant, designated PO-2W before 1952; 244 ordered, 142 produced (the rest to USAF).
One modified EC-121K used as a US Army avionics test bed
Unknown number modified as special mission aircraft
YEC-121K. One modified avionics test bed
One modified WV-2, test bed for rotating radar dome with an AN/APS-70 radar
ELINT collection variant, 13 modified WV-2
Weather reconnaissance variant, 8 modified WV-2
Unknown number modified from EC-121K as anti-submarine variant
3 EC-121P used by the USAF
10 produced, initial USAF variant
2 converted from C-121C and 1 TC-121C as avionics test beds
9 RC-121C modified before 1962 as crew trainers
73 produced 1953–55 as main USAF variant and 1 converted from C-121C, originally designated RC-121D
EC-121D Quick Look
1 test bed for QRC-248 IFF transponder interrogator
42 USAF upgrades in 1962, 35x EC-121D and 7x WV-2s transferred from the Navy
2 USAF EC-121D modified with upgraded electronics
EC-121M Rivet Top
1 EC-121D test bed for Rivet Gym crypto logic linguist electronics suite, originally designated EC-121K
4 EC-121D modified with upgraded electronics for USAF Gold Digger missions
30 EC-121K / EC-121P transferred to USAF in 1966–1967 and converted to Batcat sensor signal processor
5 converted for Pennsylvania Air National Guard from USAF C-121 transports
Final USAF variant. A total of 22 T’s were converted from 15x EC-121D and 7x EC-121H.
Proposed naval development with new features such as 4 Allison T56-A8 turboprop engines, L-1649A Starliner wings and Bomarc missiles for defense.
None built; was designated L-084 due to the large differences from its predecessors.
Typically six flight crew, 11–25 radar crew
116 ft 2 in (35.40 m)
126 ft 2 in (38.45 m)
24 ft 9 in (7.54 m)
1,650 sq ft (153.27 m2)
69,210 lb (31,387 kg)
Max take-off weight
143,000 lb (65,000 kg)
4 × Wright R-3350-34 turbo compound 18-cylinder supercharged radial engines, 3,400 hp (2,536 kW) each
299 mph (481 km/h, 260 kn)
255 mph (410 km/h, 222 kn)
4,250 mi (6,843 km, 3,700 nmi)
25,000 ft (7,620 m)
Rate of climb
960 ft/min (4.87 m/s).
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