Antelope Valley Hitches Hopes to Shuttle’s Heir : Competing Designs
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PALMDALE — Three contractors are vying to build the X-33, a prototype for a reusable launch vehicle envisioned as a low-cost replacement for the space shuttle. The experimental, single-stage spacecraft would have a lightweight composite structure, reusable cryogenic tanks, and durable thermal protection systems--all capable of withstanding multiple launches and reentries. It would be about 100 feet long, and would be fueled by liquid hydrogen. NASA will select the winning X-33 design in June.
LOCKHEED MARTIN
* Takeoff: Vertical
* Landing: Horizontal
* Highlight: Pilotless. Wingless lifting body
ROCKWELL INTERNATIONAL
* Takeoff: Vertical
* Landing: Horizontal
* Highlight: Pilotless. Most similar to space shuttle.
McDONNELL DOUGLAS/BOEING
* Takeoff: Vertical
* Landing: Vertical
* Highlight: Flight crew of two. Based on McDonnell’s experimental Delta Clipper rocket
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