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[i]Stories circulated that engineers at Sierra Nevada Corporation were having a hard time scaling up the hybrid engine system from the small, X-1 sized SpaceShipOne prototype to its business jet sized successor. Oscillations sufficiently severe that nobody would want to ride the vehicle.
The stories have persisted and, if anything, have grown stronger. The latest one circulating in Mojave is that the test in March didn’t go well, and that the propulsion team has decided to abandon the hybrid rocket for a liquid system. There is also a confirmed report that Virgin Galactic has formed its own propulsion team and hired the former director of SpaceX’s Texas engine testing facility — and an expert in liquid propulsion — as a member of it.[/i]
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