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Virgin Galactic finally admitted to its engine troubles on Friday.
They have dumped the original engine, switching to a different engine design that the rumors have said they have been testing for the past year.
Though it is a good thing that the company has finally come clean and made the switch, they probably waited far too long to do it, as the problems with the old engine likely caused several years delay in their schedule, allowing other companies to catch up with them and thus losing the significant technological advantage that they once held.