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 0.9.1.5 in mid-2008...

The North American Aviation XB-70 Valkyrie is a retired prototype version of the planned B-70 nuclear-armed, deep-penetration supersonic strategic bomber...

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...

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)...

XeroBank anonymity networks, and is available as component of the xB Machine and the xB Installer. It is designed for use on portable media such as a USB...

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...

The Northrop YB-35/XB-35, Northrop designation N-9 or NS-9, were experimental heavy bomber aircraft developed by the Northrop Corporation for the United...

The Martin XB-48 was an American medium jet bomber developed in the mid-1940s. It competed with the Boeing B-47 Stratojet, which proved to be a superior...

completely obsolete. Martin received the 1932 Collier Trophy for designing the XB-10. The B-10 began as the Martin Model 123, a private venture by the Glenn...

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. In 1944, the War Department...

The Martin XB-33 Super Marauder was a proposed World War II American bomber aircraft. It was designed by the Glenn L. Martin Company as the Martin Model...

The North American XB-28 (NA-63) was an aircraft proposed by North American Aviation to fill a strong need in the United States Army Air Corps for a high-altitude...

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...

The XB-38 Flying Fortress was a single example conversion of a production B-17E Flying Fortress, testing whether the Allison V-1710 V type engine could...

produced in many experimental and production models. Section source: Baugher The XB-29, Boeing Model 345, was the first accepted prototype or experimental model...

The Douglas XB-31 (Douglas Model 332) was the design submitted by Douglas after the request by the United States Army Air Forces for a very heavy bomber...

30 in (7.6 mm) machine guns 1 × .30 in (7.6 mm) machine gun Bombs: >4,000 lb (1,800 kg) Related development Martin B-26 Marauder Martin XB-33 Super Marauder...

fourteen .50 in (12.7 mm) machine guns. It was to have an estimated gross weight of 101,000 lb (46,000 kg). The first contract for two XB-32s was signed on 6...

XB-43 Jetmaster is an American 1940s jet-powered prototype bomber. The XB-43 was a development of the XB-42, replacing the piston engines of the XB-42...

The Lockheed XB-30 (company model L-249) was the design submitted by Lockheed after the request by the United States Army Air Forces for a very heavy bomber...

The Huff-Daland XB-1 was a prototype bomber aircraft built for the United States Army Air Corps. The XB-1 was the first aircraft named using just a B-...

1979 XB is a lost asteroid with a short observation arc of 3.9 days that cannot be recovered with targeted observations and awaits serendipitous survey...

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...

"XB-47"; on 17 December 1947, the first prototype performed its maiden flight. Facing off competition such as the North American XB-45, Convair XB-46...

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...

eight men, the XB-21 featured a remarkably strong defensive armament for the time, including as many as five .30-calibre M1919 machine guns. These were...

providing more firepower for the formation. The XB-41 Liberator was outfitted with 14 .50 caliber (12.7 mm) machine guns. This was achieved by adding a second...

12.7mm (.50 BMG) machine guns (or 12 machine guns and one 20 mm (0.8 in) cannon) in five turrets. First flying in May 1945, the sole XB-44 proved 50–60 mph...

Fortress gunship and its Liberator-derived XB-41 counterpart. The XB-41 had fourteen .50 in (12.7 mm) machine guns, including a Bendix chin turret and a...

the only standardized ammunition for the Western Bloc. Prototypes XB-1 through XB-5 were akin to AR-15-series rifles with some exterior changes; designers...