Mentre lo X-37B continua indisturbato, a quasi un anno dal suo quarto lancio, ad inanellare orbite intorno al pianeta ..... il progetto dello 'spazioplano' senza pilota XS-1 avanza a piccoli passi .....
Fonte ..... "DARPA to hold open competition for XS-1 demonstration phase" .....The US Defense Advanced Research Projects Agency (DARPA) will accept outside bids for the construction and demonstration of a reusable, unmanned “XS-1” spaceplane.
DARPA has been working with industry teams Boeing-Blue Origin, Masten Space Systems-XCOR Aerospace and Northrop Grumman-Virgin Galactic to mature three competing designs.
However, it will select just one team for Phase II and III, worth up to $140 million.
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