The X-43 was little more than a proof-of-concept that a hypersonic scramjet powered plane was possible. The X-51, however...
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The X-51 expanded on the X-43's, and was able to use its scramjet for more than 2.5 minutes, albeit being a little slower.
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The data gathered from both jets showed the hypersonic heat and compression of shockwaves that NASA would have to deal with.
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And paved the way for future supersonic/hypersonic technologies such as hypersonic cruise missiles and supersonic airliners.
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