X-42 Pop-Up Upper Stage - All About All

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

• GlobalSecurity.org: X-42 (http://www.globalsecurity.org/space/systems/x-42.htm)
• FAS.org (http://www.fas.org/spp/military/program/launch/x-42.htm)

Related content

Related development:

Comparable aircraft:

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

See also:

• List of experimental aircraft
• X-plane