It’s been a little more than a year since Virgin Galactic performed the first powered flight of SpaceShipTwo (SS2) in the skies above Mojave Air and Space Port in California on April 29, 2013. Since then, though, SS2 has made only two more powered flights: September 5 and January 10. While Virgin Galactic officials said at public forums in recent weeks that SS2 powered flights would resume soon, a new report suggests it may be some time before SS2 returns to the skies, let alone makes it into space.
According to a report in The Sunday Times of London today (subscription required), SS2’s carrier aircraft, WhiteKnightTwo (WK2), is grounded because of an issue with the aircraft’s carbon composite wings. The plane had been undergoing an annual inspection, as well as a replacement of its landing gear, when “defects” were found in the wings. The Times report cited sources that described the defects as “multiple cracks,” but Virgin Galactic CEO George Whitesides told the paper that they were “adhesive imperfections” created by extra glue sticking out where sections of the wing were joined together.
The co-author of the Times report, Doug Messier, publishes the Mojave-based Parabolic Arc that has closely tracked Virgin Galactic’s progress and setbacks. In a post this morning, he offers some more details about the wing issue, reporting that sources describe them as cracks (not, he notes, “imperfections”) running along the wing spars. “One particularly worrisome aspect is that nobody knows why or when they occurred,” he writes, adding that there is “some comfort in the repairs being made” because of Scaled Composites’ experience in repairing composite aircraft.
Be they cracks or imperfections, Whitesides said they had only a “negligible impact” on the strength of WK2’s long wing and the aircraft’s flying performance. The imperfections had been “buffed out” and the plane is scheduled to resume flights in the first week of June.
That schedule would suggest that the next opportunity for a powered flight of SS2 would not be until later in June, assuming that WK2 makes one or more test flights before carrying SS2 on a powered flight. That also assumes that SS2’s hybrid engine is ready as well: in the Times article, Whitesides said vibration issues with the motor had been resolved. (Messier reported Saturday that static engine tests continue, including one on Thursday.)
The Times article also raises another concern about Virgin Galactic. A copy of the customer contract obtained by the newspaper states that the company only guarantees to take people to an altitude of at least 50 miles (80 kilometers) above the Earth. That is below the “Kármán line” of 100 kilometers that used as the de facto boundary of space by many organizations, including the X PRIZE Foundation, who ran the Ansari X PRIZE won by SpaceShipOne in 2004. It’s also below what Virgin Galactic officials have publicly said as well, indicating that SS2 flights would go to at least 100 kilometers. The 50-mile mark, though, is the boundary used by NASA and the US Air Force in awarding astronaut wings, and the company told the Times “its goal was to reach 60 miles,” just below the 100-kilometer mark.
Virgin Galactic officials have, publicly, indicated that the company remains on track for flying into space later this year and beginning commercial flights before year’s end. Speaking at the American Astronautical Society’s Goddard Memorial Symposium outside Washington, DC, on March 6, Whitesides said that the company had been focused on outfitting the interior of SS2 while WK2 underwent an annual inspection. “We’re doing the groundwork for the fourth powered flight,” he said at the time. “We’ll have a few different flights before we get to the space altitude flight.” He didn’t specify when that next powered flight would take place.
At the Space Tech Expo conference in Long Beach, California, on April 3, Virgin Galactic vice president for special projects Will Pomerantz also didn’t provide details on when those powered test flights would resume, other than in the near future. “Our flights are scheduled to begin towards the end of this calendar year,” he said of when commercial service would begin.
Those initial commercial flights, though, may not carry tourists. Later in his Space Tech Expo presentation, Pomerantz said that “some of our first flights, perhaps our first commercial flights period, will be for NASA through the Flight Opportunities program, flying engineering and technology demonstration payloads.” He said later those flights would be dedicated flights—that is, no mixing of tourists and experiments—which could allow the company to build up more flight experience before ramping up tourist flights.
As recently as last week, Virgin founder Sir Richard Branson said the company was still on track to begin commercial SS2 flights—with him on board the first one—this year. “As always, safety will ultimately call the shots, but right now, I’m planning to go to space in 2014!” he told Reuters last week in an email.
In the Times article, though, Whitesides is more cautious. “We have got a good shot at getting Richard to space this year, but we are not going to be rushed,” he says. “We are doing it right and we are taking our time.”
“We’re late, there is no question,” he added.