YF-12A to withstand skin temperatures of more than 500 degrees Fahrenheit (generated by air friction), 93 percent of its structural weight is made up of titanium alloys. The aircraft also is coated with a special black paint that helps radiate heat from its skin. All aircraft components were developed especially for the environment of sustained Mach 3+ cruise. May 1, 1965. (b/w), Graphic courtesy of NASA
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