The Virgin team just conducted an extremely significant night rocket motor firing, which has been described by Matt Stinemetze, Scaled Composites’ Program Manager for the development and testing of our space vehicles, in the fantastically descriptive piece below. His words show the huge excitement now emanating from the Mojave Desert, as we move closer to breaking the sound barrier and then building up to full spaceflight in the coming months.
In the January, 2013 issue of IEEE Spectrum, Richard Branson says he expects to be aboard a flight into space by the end of this year . In BBC News, pilot David Mackay, said Virgin’s tourist flights are on track to start next year. The flights will reach higher than 350,000 feet.
Once Virgin Galactic’s routine flights begin, ordinary people with US $200 000 to spare—will be able to buy tickets into space. True, the company won’t take them into orbit, but it will fly them 100 kilometers (62 miles) above sea level to the Kármán line, which the Fédération Aéronautique Internationale defines as the edge of space.
The Suborbital Experience
The six passengers and two pilots will take off horizontally from the spaceport’s 3.7-kilometer-long runway in a space plane that will likely have the ambiance of a trendy business jet. This craft—dubbed SpaceShipTwo by the company that designed it, Mojave, Calif.–based Scaled Composites—will be slung beneath a double-fuselage carrier aircraft, WhiteKnightTwo, on takeoff and for the flight’s first couple of hours.
The real adventure begins after the two linked craft rise about 15 km (50 000 feet), at which point SpaceShipTwo will drop from its mounting, fire up its rocket motor, and go zooming upward into the heavens. Its passengers will then experience peak forces that are almost 4 g’s—four times normal gravity—more than what a ride up on the space shuttle gave its astronauts, although for passengers on SpaceShipTwo the push into their seats will last for just a minute or so. The feeling of acceleration will abruptly disappear when SpaceShipTwo’s rocket motor shuts down, as the craft coasts upward through a broad arc that will give its occupants about four minutes of free fall, or “weightlessness.”
Scaled Composites describes the reentry as “hands‑off” or “care‑free.” But passengers probably won’t feel so carefree when they begin to experience the deceleration—up to 6 g’s worth at peak (although that level lasts only for seconds).
“Going to 6 g’s is a serious thing, but it’s a very trainable thing,” says George T. Whitesides, president and chief executive officer for Virgin Galactic. “We put 80 of our earliest customers through that exact g profile and the vast majority did fine.” Lynda Turley Garrett, a travel agent based in Saratoga, Calif., and an “accredited space agent” for Virgin Galactic, traveled to the National AeroSpace Training and Research Center in Southampton, Penn., where she rode a simulator-equipped centrifuge that duplicated the forces that Virgin’s passengers will be challenged by. Not only did she not black out, she found the experience thrilling. “It was 100 times better than any roller coaster I’ve ever been on,” she says.
More than 500 people have already signed up to get a taste of space with Virgin Galactic.