The X-33 was a 53% scale demonstrator for an ambitious single-stage-to-orbit reusable lauch vehicle - space shuttle replacement.
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- Former X-33 aerospike engine completes test series The test of twin Linear Aerospike XRS-2200 engines, originally built for the X-33 program, was performed Monday, Aug. 6, 2001, at NASA's Stennis Space Center, Miss. While the tests verified the feasibility of the new technology, they, along with the X-33, failed to make it through the recent NASA reviews.