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The B-50B was an improved version of the B-50A. Externally, the aircraft were identical, but the -B model incorporated a strengthened wing with new lighter weight fuel cells. The first B-50B was kept by Boeing for testing and redesignated EB-50B. The rest were converted to the reconnaissance role and redesignated RB-50B. These aircraft were assigned to Strategic Reconnaissance units within the Strategic Air Command and conducted photo, weather and weapons test observation missions.
Later, the 43 of 44 RB-50Bs were converted again to RB-50E, F and G models.
Armament: 12 .50-cal. machine guns, one 20 mm cannon and 20,000 lbs. of bombs
Engines: Four Pratt & Whitney R-4360-35 Wasp Major turbosupercharged radials of 3,500 hp each
Maximum speed: 385 mph at 25,000 ft. and combat weight of 121,700 lbs.
Cruising speed: 235 mph
Range: 4,650 miles with 10,000-lb. bomb load; 5,270 miles maximum ferry range
Service ceiling: 37,000 ft.
Span: 141 ft. 3 in.
Length: 99 ft. 0 in.
Height: 32 ft. 8 in.
Weight: 170,400 lbs. (maximum takeoff weight)
Crew: 10 or 11 normally [pilot, copilot, flight engineer, navigator, bombardier, radar operator, radio operator, and four gunners (top, tail, left and right)]
Serial numbers: 47-118 to 47-162
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