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#1
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Station reboost by shuttle
Which engines did the shuttle use to reboost the station? Was it just
the aft or was it both the aft and forward RCS? Was OMS ever used for this purpose? Thanks! |
#2
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Station reboost by shuttle
This has been discussed over in sci.space.station in detail, please use
search engines there. "Steve Derry" wrote in message ... Which engines did the shuttle use to reboost the station? Was it just the aft or was it both the aft and forward RCS? Was OMS ever used for this purpose? Thanks! |
#3
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Station reboost by shuttle
"Jim Oberg" wrote in message ... This has been discussed over in sci.space.station in detail, please use search engines there. Sort of like being told that this will by your homework assignment for tomorrow! That's what you get for asking a question! No, my guess would be that the OMS engines are used for space station reboosts. Ron |
#4
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Station reboost by shuttle
"Ronzo Munroe" wrote in news:4r9Kc.1198$Qv4.805@lakeread03:
"Jim Oberg" wrote in message ... This has been discussed over in sci.space.station in detail, please use search engines there. Now, now, Jim! My own Google search turned up several hundred hits, only a few of which were relevant to the particular question asked, and none of which completely addressed the issue of forward vs. aft RCS. So it's fair to re-summarize. Sort of like being told that this will by your homework assignment for tomorrow! That's what you get for asking a question! No, my guess would be that the OMS engines are used for space station reboosts. Your guess is dead wrong. Firing the OMS while docked would quickly result in catastrophic structural failure of the shuttle/ISS stack. The answer is that the shuttle's digital autopilot (DAP) supports four reboost configurations, which use either primary or vernier RCS jets (or in one config a combination of both). The vernier-only config uses both forward and aft jets, while the other three use only aft jets. Which reboost config is chosen depends on a variety of factors, including desire to maximize ISS structural lifetime, minimize forward RCS usage, availability of vernier RCS, time available for reboost, and shuttle/ISS thermal constraints in the reboost attitude. -- JRF Reply-to address spam-proofed - to reply by E-mail, check "Organization" (I am not assimilated) and think one step ahead of IBM. |
#5
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Station reboost by shuttle
"Jorge R. Frank" wrote:
The answer is that the shuttle's digital autopilot (DAP) supports four reboost configurations, which use either primary or vernier RCS jets (or in one config a combination of both). The vernier-only config uses both forward and aft jets, while the other three use only aft jets. Which reboost config is chosen depends on a variety of factors, including desire to maximize ISS structural lifetime, minimize forward RCS usage, availability of vernier RCS, time available for reboost, and shuttle/ISS thermal constraints in the reboost attitude. Thanks! A review of earlier posts on this subject reveals that a forward-aft RCS crossfeed was scheduled for installation to support use of the forward RCS for station reboost. Has this crossfeed been installed on any of the orbiters? Is it still under consideration for installation on orbiters that don't yet have it? Listing minimization of forward RCS usage as a constraint seems to indicate that reboosts were being performed without the benefit of such a crossfeed. If that's the case, how much of a constraint is it? I know there's not much propellant up front... Steve |
#6
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Station reboost by shuttle
Steve Derry wrote in
: A review of earlier posts on this subject reveals that a forward-aft RCS crossfeed was scheduled for installation to support use of the forward RCS for station reboost. Has this crossfeed been installed on any of the orbiters? Is it still under consideration for installation on orbiters that don't yet have it? The upgrade was cancelled before it could be installed on any of the orbiters. Listing minimization of forward RCS usage as a constraint seems to indicate that reboosts were being performed without the benefit of such a crossfeed. If that's the case, how much of a constraint is it? It's a pretty major constraint; perhaps not the most important one but way up on the list of priorities. -- JRF Reply-to address spam-proofed - to reply by E-mail, check "Organization" (I am not assimilated) and think one step ahead of IBM. |
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