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What (who) is XB Machine - definition
XB Machine
xB Machine is a discontinued virtual operating system that is small enough to fit on a USB drive. The last version seems to have been 0.
Douglas XB-19
.jpg?width=200)
![XB-19A at [[Davis-Monthan Air Force Base]] before scrapping.](https://commons.wikimedia.org/wiki/Special:FilePath/Douglas XB-19 before scrapping.jpg?width=200 "XB-19A at [[Davis-Monthan Air Force Base]] before scrapping.")
PROTOTYPE BOMBER AIRCRAFT
XB-19; Douglas XB-19A; Douglas B-19; Douglas BLR-2
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. It was the largest bomber built for the USAAF until 1946, and was originally given the designation XBLR-2 (XBLR denoting "Experimental Bomber Long Range").
Boeing XB-39 Superfortress
.jpg?width=200 "General Motors modified B-29 to use Allison V-3420 engines")
PROTOTYPE BOMBER AIRCRAFT BY BOEING
XB-39; Boeing XB-39; Boeing B-39; XB-39 Superfortress; B-39 Superfortress; Boeing B-39 Superfortress
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.
