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SpaceShipTwo
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==== 2015: another fuel change ==== Following a series of rocket engine tests, Virgin announced in October 2015 that they would be changing the rocket motor back to [[hydroxyl-terminated polybutadiene]] (HTPB), with a similar formulation as they used earlier in the development program before switching to a nylon-based fuel grain. They would use HTPB to power the SpaceShipTwo when it would resume flight following the loss of the initial SS2 test vehicle in October 2014. Full qualification tests remained to be completed at the time.<ref>[http://spacenews.com/virgin-galactic-switching-back-to-rubber-fuel-for-spaceshiptwo/ SpaceShipTwo Bounces Back to Rubber Fuel] SpaceNews, 14 October 2015, accessed 26 November 2015</ref>
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