RocketSTEM Issue #9 - October 2014 | Page 51

The cockpits of White Knight and SpaceShipOne are configured identically to one another. Credit: Scaled Composites, LLC Pushing the envelope Upon winning the Ansari X Prize in 2004, billionaire Richard Branson backed Rutan’s winning Tier One vehicles, base-lining his next generation fleet of privately developed space tourism craft on them. Virgin Galactic’s “SpaceShipTwo” and “WhiteKnightTwo” would continue to be manufactured by Scaled Composites under “Tier 1b” with Rutan as the Chief Technical Officer. As with all great engineering endeavours there has been trial and error in the last ten years and Scaled Composites is no exception. New designs for the larger capacity, multi-purpose payload spacecraft and carriers needed maturation and system redundancies. Consequently a larger hybrid rocket engine for SpaceShipTwo was being tested on the ground but on 28th July 2007 a fatal accident occurred injuring others. The passing of employees Eric Blackwell, Todd Ivens and Glen May hit the close knit company and Rutan hard. All production and testing was stopped for a year while investigations into the accident proceeded. Findings of probable contamination led to revised procedures and safety checks for the already safety conscious company. A stark reminder of the past; “If we die we want people to accept it. We’re in a risky business, and we hope that if anything happens to us it will not delay the program. The conquest of space is worth the risk of life” -Apollo 1 Commander Gus Grissom Following the accident and investigation, Scaled Composites returned to work on SpaceShipTwo in 2008 with WhiteKnightTwo making its maiden flight later that year. By October 2010, SpaceShipTwo began glide test flights with incremental improvements to the spacecraft, safety, customer flight experience and ground based processes. Retaining the same feathering design lineage of SpaceShipOne, its successor demonstrated this feature in flight in May 2011. Since that time the Scaled Composites team have had three successful rocket powered flight tests of SpaceShipTwo, steadily pushing the envelope to build a safe spacecraft and a compliant, sustainable spaceline for Virgin Galactic. 21st century gold rush SpaceShipOne’s successes not only opened the doors for Virgin Galactic, but also whet the appetites of those eager to claim the high ground in the new commercial race to space. As of 2014, 700 would be astronauts have signed up for a ride on the new SpaceShipTwo paying $250,000. The $50 million America’s Space Prize orbital spaceflight competition ran from 2004-10 and the X Prize Foundation has teamed up with Google 49 www.RocketSTEM .org 49