-
#1080
by
DaveS
on 10 Jun, 2008 23:43
-
Does anyone have any photos of the section of the RSS that surrounds the aft engine compartment of the orbiter? I'm interested in knowing what the clearances are between it and the OMS pods on the orbiter. I haven't managed to locate any photos of it when the RSS is in the "Mate" position.
-
#1081
by
Lee Jay
on 10 Jun, 2008 23:52
-
I can't find a good place for this, but I'm wondering about how dire Hubble's power condition is, and if and potential long delay to the 125 servicing mission could render HST inoperable.
-
#1082
by
Austin
on 13 Jun, 2008 00:59
-
Purge Sequence 4 Question...
Reason for the "4" -- Guessing that it refers to the testing for four systems (aerosurface and engines) that are run through at that point in the count (T - 4 minutes)... elevon, rudder, speed brake and main engines (hence the four). Is this correct? If not, why the "4"?
Thanks.
-
#1083
by
Jim
on 13 Jun, 2008 03:46
-
Purge Sequence 4 Question...
Reason for the "4" -- Guessing that it refers to the testing for four systems (aerosurface and engines) that are run through at that point in the count (T - 4 minutes)... elevon, rudder, speed brake and main engines (hence the four). Is this correct? If not, why the "4"?
Thanks.
No, it is the 4th (and last) sequence of purges of the SSME's
-
#1084
by
mkirk
on 13 Jun, 2008 03:55
-
Purge Sequence 4 Question...
Reason for the "4" -- Guessing that it refers to the testing for four systems (aerosurface and engines) that are run through at that point in the count (T - 4 minutes)... elevon, rudder, speed brake and main engines (hence the four). Is this correct? If not, why the "4"?
Thanks.
There are 4 purge modes (or sequences) that are performed to condition the engines and main propulsion system for start by configuring valves and manipulating helium, nitrogen and propellant flows. Purge Sequence 4 is the last of these and runs from T-4 minutes until Start Initiation at which time all purges are terminated.
Mark Kirkman
-
#1085
by
Austin
on 13 Jun, 2008 10:30
-
Purge Sequence 4 Question...
Reason for the "4" -- Guessing that it refers to the testing for four systems (aerosurface and engines) that are run through at that point in the count (T - 4 minutes)... elevon, rudder, speed brake and main engines (hence the four). Is this correct? If not, why the "4"?
Thanks.
There are 4 purge modes (or sequences) that are performed to condition the engines and main propulsion system for start by configuring valves and manipulating helium, nitrogen and propellant flows. Purge Sequence 4 is the last of these and runs from T-4 minutes until Start Initiation at which time all purges are terminated.
Mark Kirkman
Ah, knew I could count on the K-Man!
Much obliged, Mark.
-
#1086
by
C5C6
on 14 Jun, 2008 03:26
-
what's this??? I've seen it a couple of times in the orbiter......it's definitely not a regular calculator.......
-
#1087
by
ChrisGebhardt
on 14 Jun, 2008 03:47
-
what's this??? I've seen it a couple of times in the orbiter......it's definitely not a regular calculator.......
It's a ditigital stopwatch, I believe.
-
#1088
by
Jorge
on 14 Jun, 2008 06:11
-
-
#1089
by
SpaceCat
on 14 Jun, 2008 15:27
-
Does anyone recall which was the first mission to use the 'new' MCC?
I'm thinking STS-69 or so- but would like to know for sure.
Advance thanks, _>^^<
-
#1090
by
psloss
on 14 Jun, 2008 15:31
-
-
#1091
by
AstroRJY
on 14 Jun, 2008 16:50
-
What is the logic on the APUs post-landing? Would they normally wait and let them use up most of the remaining hydraine in the APU tanks before telling the PLT to them down? OR would they siphon out any remaining fuel after landing to be used on another vehicle later? Does the hydrazine hold up well over time or would it have to be refined before being loaded in another oribter? What is the story on the hydrazine.
-
#1092
by
maxx
on 14 Jun, 2008 16:55
-
-
#1093
by
AnalogMan
on 14 Jun, 2008 17:29
-
Looking at
http://forum.nasaspaceflight.com/index.php?action=dlattach;topic=13458.0;attach=83163
I'm wondering how the Air Data Probe is deployed/stowed...
My guess is that it is mounted on some sort of carriage that go inside, rotate to place the probe outward and then go back outside or something like that. (Its hard for me to put that in words)
Is there a plan of the mechanism available somewhere? (L2 is fine for me)
On L2 go to "Spaceflight L2 STS-125/LON-400 Special" board and find the STS-125 processing thread. Messages #52 and #57 have diagrams and photos of the air data probe (ADP).
I expect there are lots of other places to find similar information, but this happens to be the one I remember seeing.
-
#1094
by
Jim
on 14 Jun, 2008 17:46
-
What is the logic on the APUs post-landing? Would they normally wait and let them use up most of the remaining hydraine in the APU tanks before telling the PLT to them down? OR would they siphon out any remaining fuel after landing to be used on another vehicle later? Does the hydrazine hold up well over time or would it have to be refined before being loaded in another oribter? What is the story on the hydrazine.
The APU's are needed to reposition the SSME's and to open the ET doors.
Hydrazine is not reused. It is disposed of.
-
#1095
by
Jim
on 14 Jun, 2008 17:50
-
Looking at
http://forum.nasaspaceflight.com/index.php?action=dlattach;topic=13458.0;attach=83163
I'm wondering how the Air Data Probe is deployed/stowed...
My guess is that it is mounted on some sort of carriage that go inside, rotate to place the probe outward and then go back outside or something like that. (Its hard for me to put that in words)
Is there a plan of the mechanism available somewhere? (L2 is fine for me)
On L2 go to "Spaceflight L2 STS-125/LON-400 Special" board and find the STS-125 processing thread. Messages #52 and #57 have diagrams and photos of the air data probe (ADP).
I expect there are lots of other places to find similar information, but this happens to be the one I remember seeing.
SCOM has pics I believe
-
#1096
by
maxx
on 14 Jun, 2008 17:55
-
Is there a plan of the mechanism [Air Data Probe] available somewhere? (L2 is fine for me)
On L2 go to "Spaceflight L2 STS-125/LON-400 Special" board and find the STS-125 processing thread. Messages #52 and #57 have diagrams and photos of the air data probe (ADP).
I expect there are lots of other places to find similar information, but this happens to be the one I remember seeing.
SCOM has pics I believe
Thanks AnalogMan and Jim
-
#1097
by
mkirk
on 14 Jun, 2008 18:07
-
Is there a plan of the mechanism [Air Data Probe] available somewhere? (L2 is fine for me)
On L2 go to "Spaceflight L2 STS-125/LON-400 Special" board and find the STS-125 processing thread. Messages #52 and #57 have diagrams and photos of the air data probe (ADP).
I expect there are lots of other places to find similar information, but this happens to be the one I remember seeing.
SCOM has pics I believe
Thanks AnalogMan and Jim
Here is a nice one from one of my workbooks.
Mark Kirkman
-
#1098
by
maxx
on 14 Jun, 2008 18:26
-
Here is a nice one from one of my workbooks.
Mark Kirkman
Thanks. Thats a simpler mechanism than what I had in mind...
There is TPS on both side, I guess the airflow is still able to heat the surface at the time the probes are deployed. Correct?
-
#1099
by
DMeader
on 15 Jun, 2008 12:46
-
what's this??? I've seen it a couple of times in the orbiter......it's definitely not a regular calculator.......
I think it is a simple little electronic timer, that you can buy at any kitchen gadget store. Seems to me I've seen the same thing at Walmart.