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[QUOTE]Originally posted by Irishman: [QB] Actually, the only reason the X-33 was cancelled was because it couldn't function as initially conceived - a single-stage-to-orbit vehicle. In its new incarnation, I suspect they'll simply change out the aerospike engines for something with a higher Isp (specific impulse) like a VASIMR, and strap on some Energia booster rockets to get it into LEO. There are no revolutionary technologies that would be required to make it work, folks. An orbital tether that someone could plant charges on, or ram a plane into? That's safe. What happens when the broken tether whips to the ground at many thousands of miles per hour?? The X-33 IS small. The plans I've seen call for a 40 meter long and wide vehicle. The shuttle is longer than that when it launches. [/QB][/QUOTE]
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