Here's another: http://pjmedia.com/tatler/2014/11/01/what-happened-to-virgin-galactics-spaceshiptwo/?singlepage=true http://pjmedia.com/tatler/2014/11/01/what-h

Here's another: http://pjmedia.com/tatler/2014/11/01/what-happened-to-virgin-galactics-spaceshiptwo/?singlepage=true http://pjmedia.com/tatler/2014/11/01/what-happened-to-virgin... Where Raul Simberg makes the point that the fallacy of sunk costs is likely in play: I also suspect that this will be the nail in the coffin for the hybrid program. Many in the industry (including me) told Virgin after the fatal test-stand explosion in 2007 that they needed to redesign and go to a liquid engine, but they had designed the airframe for the hybrid, and a liquid would have had different mass characteristics, probably necessitating a spacecraft redesign, which they were loath to do. The company appears to have been stuck in a “sunk cost” trap for years, with the belief that, despite all the years of delays, just a little more money and a little more time would finally get them to a workable engine. Yesterday morning, the trap snapped shut.