DaveS - 16/11/2005 12:33 PMRTLS on an single engine? They were in the danger of losing two engines. I don't think that's possible since you have zero bank control on the vehicle after SRB seperation. I think that for the crew's own safety, ditching the orbiter would have preferred. Sure, it would have total loss of vehicle and payload but crew would still have been alive. Ditching the orbiter would have been much safer than trying a totally untested abort in the least optimal conditions.But I could be wrong on the true capabilities of the shuttle system.
psloss - 8/12/2005 9:10 AMFor the 93 ascent, the problem was electrical/wiring; the way the main engine controllers are connected to the electrical busses (six controllers, three busses) provides for a good deal of redundancy. Each engine has two redundant controllers; they are connected to different busses such that if a single bus fails, each engine still has an operating controller. If an additional bus had failed, only one engine would have shutdown, but there would be no further redundancy. (Of course, you're already down to a single bus at that point.)
Ben - 9/12/2005 11:42 AMLet's clarify one thing here for those that may be be aware:There were two, separate problems on STS-93 during ascent. There was an electrical short due to frayed wiring coming in contact with metal. And there was a a hydrogen leak, unrelated to the short. The leak was caused when a pin broke inside the oxygen injector and was shot out of the engine, impacted the side of the nozzle and caused a rupture in the hydrogen line there which leaked the rest of the way up.
(Excerpt from the transcript regarding the post pin ejection)Post-landing inspection and detailed analyses revealed that the leak resulted from impact damage to the interior nozzle coolant tubes. The impact occurred when a main injector liquid oxygen post pin contacted 3 of the 1080 tubes (Figures 2, 3, 4). This engine’s main injector had 2 of the over 500 lox posts deactivated by a gold plated pin. STS-93 was the last planned flight of the older Phase II engines. The new and greatly improved Block II-A engines eliminate this failure mode.
Chris Bergin - 3/4/2006 4:53 AMA couple of very interesting videos, courtesy of Philip Sloss.CLICK HERE FOR VIDEO DOWNLOAD - Media Conference on how they reduced the weight of Columbia for this mission.CLICK HERE FOR VIDEO DOWNLOAD - Media Conference on the reasons for the scrub just prior to main engine start.
Shuttle>CEV - 30/6/2006 12:39 AMThe video won't load,