X-42 Pop-Up Upper Stage
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X-42 is the designation of a still-classified U.S. military space project. Specifications or photos of the program have not been released to the public; as a result not much is known about its goals. It is believed to be a liquid fueled rocket upper stage capable of boosting a payload of up to 4,000 lb (1,800 kg) into Earth orbit.
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Related development:
Comparable aircraft:
Designation Series: X-39 - X-40 - X-41 - X-42 - X-43 - X-44 - X-45
See also:
X-1 • X-2 • X-3 • X-4 • X-5 • X-6 • X-7 • X-8 • X-9 • X-10 • X-11 • X-12 • X-13 • X-14 • X-15 • X-16 • X-17 • X-18 • X-19 • X-20 • X-21 • X-22 • X-23 • X-24 • X-25 • X-26 • X-27 • X-28 • X-29 • X-30 • X-31 • X-32 • X-33 • X-34 • X-35 • X-36 • X-37 • X-38 • X-39 • X-40 • X-41 • X-42 • X-43 • X-44 • X-45 • X-46 • X-47 • X-48 • X-49 • X-50 • X-51
See also List of experimental aircraft
