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Originally Posted by Stratolaunch Systems
We hit another important milestone this week by completing the first phase of engine testing. For the first time we started the aircraft’s six Pratt & Whitney turbofan engines.
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19 Sept 2017 Press Release :-
http://www.stratolaunch.com/news/EngineTesting.html
Photo gallery showing engine nacelles opened up :-
http://www.stratolaunch.com/gallery.html