page_title: Boeing B-52 Stratofortress
section_title: Engines
hierarchical_section_title: Boeing B-52 Stratofortress / Design / Engines
caption_attribution_description: English: USAF Boeing B-52H Stratofortress engines
context_page_description: The Boeing B-52 Stratofortress is an American long-range, subsonic, jet-powered strategic bomber. The B-52 was designed and built by Boeing, which has continued to provide support and upgrades. It has been operated by the United States Air Force since the 1950s. The bomber is capable of carrying up to 70,000 pounds of weapons, and has a typical combat range of more than 8,800 miles without aerial refueling.
  Beginning with the successful contract bid in June 1946, the B-52 design evolved from a straight wing aircraft powered by six turboprop engines to the final prototype YB-52 with eight turbojet engines and swept wings. The B-52 took its maiden flight in April 1952. Built to carry nuclear weapons for Cold War-era deterrence missions, the B-52 Stratofortress replaced the Convair B-36. A veteran of several wars, the B-52 has dropped only conventional munitions in combat. The B-52's official name Stratofortress is rarely used; informally, the aircraft has become commonly referred to as the BUFF.
  The B-52 has been in service with the USAF since 1955. As of June 2019, 58 are in active service, 18 in reserve, and approximately 12 more aircraft in long-term storage.
context_section_description: The eight engines of the B-52 are paired in pods and suspended by four pylons beneath and forward of the wings' leading edge. The careful arrangement of the pylons also allowed them to work as wing fences and delay the onset of stall. The first two prototypes, XB-52 and YB-52, were both powered by experimental Pratt & Whitney YJ57-P-3 turbojet engines of 8,700 lbf (38.70 kN) of static thrust each.
  The B-52A models were equipped with Pratt & Whitney J57-P-1W turbojets, providing a dry thrust of 10,000 lbf (44.48 kN) which could be increased for short periods to 11,000 lbf (48.93 kN) with water injection. The water was carried in a 360-gallon tank in the rear fuselage.
  B-52B, C, D and E models were equipped with Pratt & Whitney J57-P-29W, J57-P-29WA, or J57-P-19W series engines all rated at 10,500 lbf (46.71 kN). The B-52F and G models were powered by Pratt & Whitney J57-P-43WB turbojets, each rated at 13,750 lbf (61.16 kN) static thrust with water injection.
  On 9 May 1961, B-52H started being delivered to the Air Force with cleaner burning and quieter Pratt & Whitney TF33-P-3 turbofans with a maximum thrust of 17,100 lbf (76.06 kN).
caption: USAF B-52H Stratofortress engines
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