>>"SpaceX proposes its first launch of Falcon 9 to occur only a few months before its first Falcon 9 launch of a Dragon spacecraft. I was pointing out that Gemini Titan proceeded differently. Dozens of Titan II flights took place over a period of two years before the first Titan II Gemini launch took place." <<<br /><br /> />"You are repeating the Jeffrey Bell error... <br /><br />...of comparing the flight history of cutting edge technology from once upon a time -- to the difficulty of recreating 50 year old, well understood technology today. "<<br /><br />I'm not suggesting that SpaceX should fly two dozen Falcon 9s (Falcon 9, not "Falcon IX", BTW) before it launches a Dragon. I'm just pointing out that historically there has been more than a few months between the first launch of a new launch vehicle and the first launch of a human-type spacecraft on that new launch vehicle - with the obvious exception of NASA's many-billions-dollar space shuttle program. <br /><br />Worldwide launch vehicle reliabilty rates have improved since the early 1960s, but nearly all of that improvement occurred before 1970 or so. SpaceX has yet to show whether it will suffer early 1960s failure rates or whether it will match the post-1970 reliability standards. It hasn't even managed a success with its tiny Falcon 1 yet, let alone with a nine-engine launch vehicle that will weigh more than the basic EELV variants at liftoff.<br /><br /> - Ed Kyle