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In page Boeing X-48:
"The X-48B has a 21-foot (6.4 m) wingspan, weighs 392-pound (178 kg), and is built from composite materials. It is powered by three small turbojet engines and is expected to fly at up to 120 kn (220 km/h) and reach an altitude of 10,000 feet (3,000 m).[2][3] The X-48B is an 8.5% scaled version of a conceptual 240-foot span design.[3][4] Though passenger versions of the X-48B have been proposed, the design has a higher probability of first being used for a military transport.[4]
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