X-42 Pop-Up Upper Stage

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.

External links

X-42, globalsecurity.org
X-42 Pop-Up Upper Stage, Federation of American Scientists

Related content

Related development:

Comparable aircraft:

Designation Series: X-39 - X-40 - X-41 - X-42 - X-43 - X-44 - X-45

USAF / Joint Service experimental aircraft (X-plane) designations since 1941

1–25	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-24A / B X-25

26–50	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-47A / B / C X-48 X-49 X-50

50–	X-51 X-52¹ X-53 X-54 X-55 X-56

See also	D-558-1 D-558-2 M2-F1 M2-F2 M2-F3 HL-10 AD-1

¹ Not assigned.

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