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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 ...
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 Lockheed XB-30 (company model L-249) [1] was the design submitted by Lockheed after the request by the United States Army Air Forces for a very heavy bomber, the same request that led to the Boeing B-29 Superfortress, the Douglas XB-31 and Consolidated B-32 Dominator.
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 ...
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 XB-16 was designed to meet the United States Army Air Corps (USAAC) request for a bomber that could carry 2,500 lb (1,100 kg) of bombs 5,000 mi (8,000 km; 4,300 nmi). The XB-16 (Model 145A) was to use four Allison V-1710 liquid-cooled reciprocating V-engines ; contemporary American aircraft used air-cooled radial engines .
The XB-55 project had started in 1947, but by the end of the decade it was apparent that if strategic penetration in warfare were to be successful at all, it would require aircraft much faster than the jet fighter aircraft which were then being placed into operation. Thus, the funding made available by the XB-55 cancellation was earmarked for ...
The Douglas XB-19 was a four-engined, piston-driven heavy bomber produced by the Douglas Aircraft Company for the United States Army Air Forces (USAAF) during the early 1940s. The design was originally given the designation XBLR-2 ( XBLR denoting "Experimental Bomber, Long Range").