Lockheed L.749 Constellation / C-121/ WV-2 / R7V
The Lockheed Constellation L.749 variation was a long-range version of the earlier L.049. The first Constellation placed in airline service was the L.749 series. This aircraft differed from earlier versions in its increased fuel capacity and takeoff weight. The L.749 provided for 44 to 64 passengers and was powered by four 2,500-hp Wright Cyclone 18-cylinder air-cooled engines.
In service with both the U.S. Navy (WV-2) and U.S.A.F. (RC-121C) in 1955 as high-altitude early-warning radar picket. The WV-2 has very large dorsal and ventral radomes, which are not found on R7V transport versions. Basically-similar transport versions are the R7VA (U.S.N.) and C-121C. Experimental turboprop powered R7V-2 also flying. Earlier C-121A and VC-121B with shorter (95 ft. 1 in) fuselages were also in service in 1955.
The 749 Constellation was operated by the military as the C-121A and C-121B.
Reconnaissance and early-warning aircraft
Engines: 4 x Wright R3350-34W Turbo-Cyclone, 2,250 h.p.
Wingspan: 123 ft
Length: 113 ft. 7 in
Loaded weight: 130,000 lb
Max. speed: 350 mph
Max. range: over 4,000 miles at 330 mph
Crew: Up to 31