Quote from: elmarko on 09/23/2009 08:58 pmQuote from: kneecaps on 09/23/2009 02:58 pmQuote from: elmarko on 09/23/2009 02:53 pmAppears at liftoff, according to Ascent Guidance workbook. I imagine as guidance converges the prediction changes.So thats the question really...it appears at liftoff, but does it display XX:XX...crazy values, too high values, too low values...and then once into MM103 settles down into a good value? I imagine it has some sort of I-loaded value at liftoff, and then it doesn't change during 1st stage (because it's open loop, so there's no inputs from the system), and then during the cycles of convergence they change.Whether that means going lower or higher would depend on the initial value, obviously.Any insight from Jorge/Mkirk?Guidance doesn't compute TMECO until MM103.
Quote from: kneecaps on 09/23/2009 02:58 pmQuote from: elmarko on 09/23/2009 02:53 pmAppears at liftoff, according to Ascent Guidance workbook. I imagine as guidance converges the prediction changes.So thats the question really...it appears at liftoff, but does it display XX:XX...crazy values, too high values, too low values...and then once into MM103 settles down into a good value? I imagine it has some sort of I-loaded value at liftoff, and then it doesn't change during 1st stage (because it's open loop, so there's no inputs from the system), and then during the cycles of convergence they change.Whether that means going lower or higher would depend on the initial value, obviously.Any insight from Jorge/Mkirk?
Quote from: elmarko on 09/23/2009 02:53 pmAppears at liftoff, according to Ascent Guidance workbook. I imagine as guidance converges the prediction changes.So thats the question really...it appears at liftoff, but does it display XX:XX...crazy values, too high values, too low values...and then once into MM103 settles down into a good value?
Appears at liftoff, according to Ascent Guidance workbook. I imagine as guidance converges the prediction changes.
Mach 25 is right! TMECO is not even shown on the PASS or BFS ASCENT TRAJ 1 Displays (first stage, OPS 102). It appears on PASS & BFS ASCENT TRAJ 2 (second stage OPS 103) during staging. The crew will check that both the PASS and BFS independently come up with stable estimates for MECO within ~ 10 seconds of staging (guidance convergence). Both of the PASS & BFS predictions should closely agree with each other. The time will be displayed as something like 08:32.Mark Kirkman
Quote from: mkirk on 09/23/2009 10:17 pmMach 25 is right! TMECO is not even shown on the PASS or BFS ASCENT TRAJ 1 Displays (first stage, OPS 102). It appears on PASS & BFS ASCENT TRAJ 2 (second stage OPS 103) during staging. The crew will check that both the PASS and BFS independently come up with stable estimates for MECO within ~ 10 seconds of staging (guidance convergence). Both of the PASS & BFS predictions should closely agree with each other. The time will be displayed as something like 08:32.Mark KirkmanThanks..thats narrowed it down. So although the TRAJ display layout is basically the same there is essentially a TRAJ display for MM101,102 and 103. TMECO is not present until MM103 when it appears on the display, and (hopefully!) rapidly converges to a sensible TMECO. Of course the BFS has two vastly different TRAJ displays (1 & 2)...and TRAJ 1 doesn't have TMECO and TRAJ 2 does. There is no way to determine whats on the different PASS TRAJ displays and when from the DPS dictionary. I've always thought TRAJ 1 and TRAJ 2 on the BFS seem to provide a clearer look at the ascent situation than the single PASS TRAJ. The PASS TRAJ has a lot of 'screen real-estate' taken up with RTLS stuff. Presumably on a normal ascent the crew will watch the BFS TRAJ displays more than pass (or maybe they are all equally covered in the 'instrument scan').
Okay, manifest question. A FAWG manifest dated April 21, 2005 had STS-119/ISS 15A delivering the S-6 truss prior to the launch of Node 2 and the international partner lab modules. We know that 119 was postponed until after those modules were delivered to the station in order to allow those labs to get up and running sooner. When was the manifest changed, and is there any memo, press release, or other documentation availalbe re this change?
Well ok, the Ascent Guidance workbook says that:* (pages 6-18 and 6-20) ASCENT TRAJ 1 and 2 are available in the BFS only (1 comes up at MM102/SSME Ignition, 2 comes up at MM103/SRB SEP)* (page 6-22) XXX ASCENT TRAJ is available in the PASS and that it comes up automatically at SSME start (does that mean it remains on a CRT throughout the entire ascent? And if so, kneecaps original question of what the TMECO field displays before MM103 still applies).Hence, I'm a little confused.It seems that certain documents conflict here. My brain hurts. Thanks for your answers so far, though!
Quote from: NavySpaceFan on 09/24/2009 12:43 pmOkay, manifest question. A FAWG manifest dated April 21, 2005 had STS-119/ISS 15A delivering the S-6 truss prior to the launch of Node 2 and the international partner lab modules. We know that 119 was postponed until after those modules were delivered to the station in order to allow those labs to get up and running sooner. When was the manifest changed, and is there any memo, press release, or other documentation availalbe re this change?Have you tried searching NSF? I found a story on the timing by just plugging "15A site:nasaspaceflight.com" into Google.Actually, this probably ends up being at least as much an ISS question as a shuttle question...15A was in front of 10A in the assembly sequence going back to before STS-107.Edit: actually, it also involves RTF and VSE and probably ESAS, too.
Okay, manifest question. A FAWG manifest dated April 21, 2005 had STS-119/ISS 15A delivering the S-6 truss prior to the launch of Node 2 and the international partner lab modules. We know that 119 was postponed until after those modules were delivered to the station in order to allow those labs to get up and running sooner. When was the manifest changed, and is there any memo, press release, or other documentation available re this change?
This ought to be fairly well known but I cant seem to find any info anywhere:How much do the expendables cost on the shuttle per launch, im talking about the cryo's, ET, srb propellant, tyres etc.Come to think of it, is there a document covering these somewhere (a budget breakdown or such)?
1) Why was MPLM Donatello never flight certified 2) and what made Raffaello get chosen for PLM?3) One more MPLM question. Why has Leonardo been flying so much recently rather than Raffaello?Thanks
what made Raffaello get chosen for PLM?
Quote from: Spaceboy7441 on 09/26/2009 09:33 pmwhat made Raffaello get chosen for PLM?It appears that PLM will be Leonardo, not Raffaello.http://www.collectspace.com/ubb/Forum30/HTML/000371.html (September 4, 2009)"According to ISS Program Manager Mike Suffredini just two days ago, the MPLM to be adapted as the PLM is Leonardo (currently on-orbit with STS-128), not Raffaello. Suffredini did say the plan could change, but currently, Leonardo is it."
Quote from: Spaceboy7441 on 09/26/2009 09:33 pm1) Why was MPLM Donatello never flight certified 2) and what made Raffaello get chosen for PLM?3) One more MPLM question. Why has Leonardo been flying so much recently rather than Raffaello?Thanks Your third question is answered by your second question. They need time to refit the MMOD panels on Raffaello and do whatever else needs to be done to convert the MPLM into the PLM. The answer to the first question is: $$$. By forgoing flight certification for Donatello, they save money that can then be spent elsewhere. Donatello was only going to have one flight anyway (was going to be 128 I believe).
Interesting post. It was Suffredini that publicly identified Raffaello (FM-2) as the flight module to become the PLM earlier this year
Quote from: psloss on 09/27/2009 12:37 pmInteresting post. It was Suffredini that publicly identified Raffaello (FM-2) as the flight module to become the PLM earlier this yearI doubt it was Michael Suffredini. It was Daniel Hartman, manager of Integration and Operations in ISS Program.http://www.collectspace.com/ubb/Forum30/HTML/000371.html"Dan Hartman, NASA's manager for the integration and operations of the International Space Station, addressed this topic today (May 6) during a press conference: "The study is back on the table so we're looking at adding what we call a 'PLM', a permanent logistics module to the International Space Station. And I believe it is 'Unit 2' and I'm not quite sure what that one [MPLM] is specifically called"