US Lifting Bodies Studies - START (ASSET/PRIME), FDL, X-24, etc.

Late '60's FDL-9 glider from Airbreathing Hypersonic Propulsion

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From Boeing magazine 1964
 

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finally, someone find where BGRV hidding in
USAF museum, he said the noisetip of this collection is made by depleted uranium(or depleted uranium inside the noisetip as ballast?) thus the museum deside not to display it. by the way,the last aircraft has been damaged,sad.maybe the staff didn't know how to dismantle it.

so the question is : why they use DU?
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