Virgin Galactic鈥檚 WhiteKnightTwo is set to take is maiden flight in the next two weeks. The flight will be the first of dozens planned for the high-altitude craft, which could become the first privately owned vehicle to help carry tourists to the edge of space.
The high-altitude plane is designed to loft an eight-passenger craft called SpaceShipTwo to an altitude of 15 kilometres.
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There, the spaceship will detach from WhiteKnightTwo and fire a rocket to take passengers some 100 km above the Earth, where they will experience several minutes of zero gravity (see illustration). The pair are scaled-up versions of a carrier plane and spaceship that won the $10 million Ansari X prize for private spaceflight in 2004.
Since WhiteKnightTwo鈥檚 unveiling in July, the plane has passed engine and runway tests and taken small hops off the ground. The vehicle, which was developed at Scaled Composites in Mojave, California, is now ready to take off, says Virgin Galactic president Will Whitehorn.
鈥淭he first flight test will happen very quietly, as these things tend to do, but it will be before Christmas,鈥� Whitehorn told New Scientist.
Piloting WhiteKnightTwo may take some finesse. The plane is comparable in size to , a heavy, long-range bomber that flew during World War II.
Twisting effect
The craft has two fuselages, each with a cabin, that are connected by a 42-metre-long wing capable of holding 17 tonnes of weight.
鈥淭he configuration makes a lot of sense鈥� for carrying heavy payloads, says MIT aeronautical engineer .
But as WhiteKnightTwo begins to fly at higher altitudes, pilots might have to watch for effects such as 鈥渇lutter,鈥� where aerodynamic effects exacerbate natural twisting in the wings.
鈥淚n very severe cases, you get into an oscillation that actually builds and blows the airplane apart,鈥� Hansman told New Scientist. WhiteKnightTwo might be less susceptible to this effect, since it is made of fairly stiff carbon composite, Hansman says.
Glide tests
If WhiteKnightTwo鈥檚 test flights go well, the firm plans to begin carrying SpaceShipTwo into the air in mid-2009. In its first solo flights, SpaceShipTwo will gently glide back to Earth without firing its rockets, slowly exploring its ability to reach suborbital space.
To ensure safety, WhiteKnightTwo and SpaceShipTwo may require 100 to 200 test flights before the pair are ready to accept passengers, Whitehorn says.
This testing regime should still put the firm on track to take its first passengers to the edge of space as early as 2010, Whitehorn says.
Virgin Galactic has accumulated some $40 million in deposits from almost 300 interested space farers since the company began selling tickets in 2005.
Climate studies
But the firm will have competition in the suborbital space tourism market. On 2 December, XCOR Aerospace announced it would sell rides on its two-seat spacecraft Lynx for less than half of Virgin鈥檚 $200,000 ticket.
If WhiteKnightTwo鈥檚 initial flights go well, the plane will carry atmospheric testing equipment on the rest of its test flights, Whitehorn says.
The equipment, part of a collaboration with the US National Oceanic and Atmospheric Administration, will test the air at high altitudes, which are understudied because they are difficult for most aircraft to reach.
The data collected could also help calibrate NASA鈥檚 , which will launch in 2009 to measure carbon dioxide levels in Earth鈥檚 atmosphere, Whitehorn says.
