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The Radioactive Alternative To The X-15 - Faster, Higher, Cheaper. The Douglas D-684

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  • The Radioactive Alternative To The X-15 - Faster, Higher, Cheaper. The Douglas D-684

    During the 1950's when designers created their proposals for what would become the X-15 the Douglas D684 stood out as being lighter, faster & cheaper than the others. It was also made of a slightly radioactive alloy. Ultimately it lost the competition for this decision, but not for the reason you might think.
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