Quote from: Wayne Hale on 10/27/2014 01:54 pmI really wanted to refer to the L2 integrated video of the MCC calls during the STS-93 ascent, but it is still behind the NSF paywall . . . any chance you could put that on the free part of the site?Sure. I'll upload it to youtube in 10 minutes.PS It's not a paywall, it's a place where supporters of the site gain access to access to all our database (which would bankrupt us if everyone could use it).
I really wanted to refer to the L2 integrated video of the MCC calls during the STS-93 ascent, but it is still behind the NSF paywall . . . any chance you could put that on the free part of the site?
So was the LOX shortfall due to more being used to compensate for the loss of H2 leaking from the nozzle tubes?If 5 and not 3 tubes had been breached, when you refer to the nozzle failing, what would have been the outcome? Would the vehicle have survived for an RTLS or TAL?Thanks.
LOX shortfall of 405 lbs was backed out by post flight analysis. The engines were shut down by the LOX Engine Cutoff sensors in the Orbiter MPS plumbing showing 'dry'. The resulting underspeed (shortfall from what guidance wanted) was 15 fps. The orbital maneuvering system uses about 20 lbs of hypergols per fps (maybe a tad more since this orbiter/payload combination was heavy), ergo my estimate that about 300 lbs of OMS propellant made up the shortfall. Remember the SSMEs were pushing not only the orbiter and payload but also the ET and whatever residuals (hydrogen) remained in the tank.
In essence, the MCC is operated fuel rich(oxidizer lean) to control MCC temps/pressures.
It wasnt until after a minute into the flight, that the Booster Officer/team realized that a nozzle leak was a possibility, ...
Quote from: Hog on 10/31/2014 03:02 pmIn essence, the MCC is operated fuel rich(oxidizer lean) to control MCC temps/pressures.Isn't that also done to increase ISP?QuoteIt wasnt until after a minute into the flight, that the Booster Officer/team realized that a nozzle leak was a possibility, ...Was I the only one that was amazed when Booster figured that out and said so on the loop audio posted above? I thought that was pretty amazing.
If I win the Lottery, I'm going to pay Mr. Hale silly money to just talk to me about Shuttle for an afternoon. It would money well spent! Wow:http://waynehale.wordpress.com/2014/11/02/significant-conversations/
@waynehaleOff to Virginia for a solid week of engineering work!
The composition of the AIB is as follows: [...]Members[...]Wayne Hale, Independent Consultant and Former NASA Space Shuttle Program Manager