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The Boeing XB-15 (Boeing 294) was a United States bomber aircraft designed in 1934 as a test for the United States Army Air Corps (USAAC) to see if it would be possible to build a heavy bomber with a 5,000 mi (8,000 km) range. For a year beginning in mid-1935 it was designated the XBLR-1. When it first flew in 1937, it was the most massive and ...
Martin XB-27 heavy bomber: n/a: abandoned project: 0: Martin XB-33 Super Marauder heavy bomber: n/a: abandoned project: 0: Naval Aircraft Factory SBN dive bomber: 1936: retired 1942: 31: North American A-27 attack: 1940: retired 1941: 10: North American T-6 Texan light attack: 1940: retired: 15,495 [notes 4] North American XB-21 medium bomber ...
XB-19A at Davis-Monthan Air Force Base before scrapping. The new U.S. Air Force had plans to save the XB-19 for eventual display, but in 1949 the Air Force did not have a program to save historic aircraft and the Air Force Museum had not yet been built. [10] [11] The XB-19 was therefore scrapped, but two of its enormous main tires were saved. [c]
The Boeing XB-39 Superfortress was a United States prototype bomber aircraft, a single example of the B-29 Superfortress converted to fly with alternative powerplants. It was intended to demonstrate that the B-29 could still be put into service even if the first choice of engine, the air-cooled Wright R-3350 radial engine, ran into development or production difficulties.
The Douglas XB-42 Mixmaster is an experimental American bomber aircraft, designed for a high top speed. The unconventional approach was to mount the two engines within the fuselage driving a pair of contra-rotating propellers mounted at the tail in a pusher configuration , leaving the wing and fuselage clean and free of drag-inducing protrusions.
Thus, the funding made available by the XB-55 cancellation was earmarked for the study of a supersonic medium bomber, and a request for proposals was extended to several aircraft companies. Boeing submitted a proposal for a four-engine, high-wing aircraft with a highly streamlined fuselage. The four engines would be buried in thickened wing ...
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.
The Convair XB-46 was a single example of an experimental medium jet bomber which was developed in the mid-1940s but which never saw production or active duty. It competed with similar designs, the North American XB-45 and Martin XB-48 , all of which saw little use after the successful development of the Boeing XB-47 .