Engine: One Pratt & Whitney J57-P-37A of 11,000 lbs. thrust (J75-P-13 of 17,000 lbs. thrust for later models) Top Speed: 494 mph Length: 49ft. 7 in. Height: 13 ft. Span:80 ft. Range: 2,200 miles (over 3,000 miles for later models) Celling: Above 55,000 ft. (above 70,000 ft. for later models) Single-engine U-2 with sailplane-like wings was designed for surveillance missions in thin atmosphere above 55,000 feet altitude. Their use was secret until 1966 when Frances Gary Powers was shot down over Russia while on a non USAF recon flight U-2A displayed at USAF Museum. W-PAFB. Ohio was last A model built.