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January 24, 2018
 

Virgin Galactic conducts 7th glide test of spacecraft

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Virgin Galactic says the latest glide test of its space tourism rocket plane was a success, nearly reaching the speed of sound high over California.

The spaceship, named Unity, was carried aloft by its mother ship on Jan. 11 and released over the Mojave Desert.

“It’s been a few months since our last flight, during which we worked through a planned period of focused ground time,” said a Virgin Galactic release. “This involved extensive analysis, testing and small modifications to ensure vehicle readiness for the higher loads and forces of powered test flight.

“Today we tested that work by pushing Unity’s atmospheric capabilities hard, touching top-end glide speeds as pilots Mark ‘Forger’ Stucky and Michael ‘Sooch’ Masucci completed a busy test card.

“Alongside confirming the work that has taken place on the ground, the glide flight tested transonic flight performance, stability and control,” the release continued. “After release from mothership VMS Eve, the spaceship was immediately pushed into a sharp descent, accelerating to Mach 0.9 which is around the maximum airspeed we can achieve without igniting the rocket motor.”

At this stage of the glide flight program, each flight is essentially a dry run for rocket-powered test flights.

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Where possible the team replicates those powered flight conditions by, for example, adding water ballast to simulate the weight and positioning of the rocket motor. As during previous flights, the water ballast was jettisoned at around 22,000 feet, allowing the pilots to complete the flight and land in a lighter configuration, again simulating the conditions which will apply during space flight. Also as a precursor to powered flight, VSS Unity flew today with her thermal protection system fully applied. This ensures that heat loads generated by air friction during rocket-powered boost and supersonic re-entry cause no damage to the vehicle.

“It’s a good look though, with the upper surfaces of the previously white feather flaps now covered in a protective silvered film,” the company said.

Virgin Galactic did not indicate whether the program is ready to move on to rocket-powered test flights.




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