The Boeing XB-56 was a proposal by Boeing for a re-engined version of the American jet-powered medium bomber aircraft, the B-47 Stratojet. The original designation for this modification was YB-47C.

The B-47C was also known as the XB-56. Two B-47 aircraft were modified to XB-47Ds in 1955 when the inboard engine pods were replaced by Curtiss Wright YT49-W-1 turboprop engines of 10,000 horsepower.

The B-47C was redesignated the XB-56 and subsequently cancelled because of problems with development and a shift of interest towards the budding B-52 program. However, during its...

The Boeing XB-56 was a proposal by Boeing for a re-engined version of the American jet-powered medium bomber aircraft, the B-47 Stratojet. The original designation for this modification was YB-47C.

The Boeing XB-56 was a proposal by Boeing for a re-engined version of the American jet-powered medium bomber aircraft, the B-47 Stratojet. The original designation for this modification was YB-47C. Design and development. The B-47 was equipped with six General Electric J47 turbojets, each rated at 5200lb-f thrust.

Boeing XB-55: Long-range heavy bomber powered by four Allison T-40 turboprops housed in pods under a slightly swept- back wing. Abandoned before prototype could be completed because of greater promise of B-52. Boeing XB-56: Version of B-47 with four Allison J-71 jets. Project was canceled before prototype could be completed.

The Boeing B-56 was a proposal by Boeing for a re-engined version of the United States jet-powered medium bomber aircraft, the B-47 Stratojet. The original designation for this modification was YB-47C.

The Boeing XB-55 (company designation Model 474) was a proposed Boeing aircraft designed to be a strategic bomber. The XB-55 was intended to be a replacement for the Boeing B-47 Stratojet in United States Air Force (USAF) service.

El Boeing B-56 fue una propuesta de Boeing de una versión cuatrimotor del avión bombardero medio a reacción estadounidense, el B-47 Stratojet. La designación original para esta modificación era YB-47C.

The B-56 program was canceled in December 1952 before conversion of the prototype was started. The unconverted B-47 was relegated to a ground instructional airframe and in the late 1960s was in use at the Naval Air Facility El Centro as an egress trainer.