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

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67
Secret NOFORN
Chapter 2
Arrival of U-2 prororype ar Area 51
(left); Article 341, the U-2
prototype (below}
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Johnson had designed the U-2 to use the Pratt & Whitney
(P&W) J57/P-3 I 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 spedally
configured Canberra RB-57Ds for the Air Force. The first U-2s there­
fore used P&W 157/P-37 engines, which were 276 pounds heavier
and delivered only 10.200 pounds of thrust at sea level; the resulting
Secret