Engines : 6 General Electric J47-GE-L5 of 7,200 lbs. thrust each Maximum Speed:610 mph. Span:116 ft. Cruising Speed:540 mph. Length:107 ft. 1 in. Service Ceiling: 47,000 ft. Height:28 ft. Weight:200,000 lbs. loaded The Stratojet, the world's first swept-wing bomber, made its initial flight on December 17, 1947 and normally carried a crew of three men. The B-47E on display at the Air Force Museum, W-PAFB, Ohio, is the last Series "E" airplane built.