X33

The X-33 was a sub scale technology demonstrator for the VentureStar under the Space Launch Initiative, a next-generation, commercially operated reusable launch vehicle. The X-33 would flight test a range of technologies that NASA believed it needed for single-stage-to-orbit reusable launch vehicles (SSTO RLVs), such as metallic thermal protection systems, composite cryogenic fuel tanks for liquid hydrogen, the aerospike engine, autonomous (unmanned) flight control, rapid flight turn-around times through streamlined operations, and its lifting body aerodynamics.
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Victim of lightning