The Central Intelligence Agency and Overhead Reconnaissance; the U-2 and Oxcart Programs, 1954-1974

Approved for Release: 2013/06/25 --- Secret NOFORN Chapter 2 67 --- [figure] --- [figure] --- Johnson had designed the U-2 to use the Pratt & Whitney (P&W) J57/P-31 engine, which developed 13,000 pounds of thrust and weighed 3,820 pounds, giving it a power-to-weight ratio of 3.4:1. When the U-2 first took to the air, however, these engines were not available because the entire production was needed to power specially configured Canberra RB-57Ds for the Air Force. The first U-2s therefore used P&W J57/P-37 engines, which were 276 pounds heavier and delivered only 10,200 pounds of thrust at sea level; the resulting --- Secret --- Approved for Release: 2013/06/25