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#1160
by
The-Hammer
on 14 Jul, 2008 21:29
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Reduces wear on the brakes and tires.
If deployed prior to NLG touchdown*, it also reduces the amount of force with which the NLG touches down which in turn reduces wear and tear on the NLG assembly.
* - Crosswinds are sometimes too high to safely deploy the drogue chute prior to NLG touchdown (because the NLG can steer).
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#1161
by
NASAAN101
on 15 Jul, 2008 21:34
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Hay guys,
i have a Questiong here, what are does this mean, i hear this during the last few seconds of the count "range satfy systems are armed" and, the firing chain armed, what dose that actully mean?
Nikki
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#1162
by
maxx
on 16 Jul, 2008 01:27
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Hay guys,
i have a Questiong here, what are does this mean, i hear this during the last few seconds of the count "range satfy systems are armed" and, the firing chain armed, what dose that actully mean?
Nikki
IIRC, that means, to put it rater crudely, that they are ready to blow the whole thing off with explosive to avoid threating the population around the launch pad if the stack heads the wrong way...
Correct me if I'm wrong...
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#1163
by
Jim
on 16 Jul, 2008 01:49
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Hay guys,
i have a Questiong here, what are does this mean, i hear this during the last few seconds of the count "range satfy systems are armed" and, the firing chain armed, what dose that actully mean?
Nikki
The firing chain is all the pyros for liftoff. The ROFI's, SRB hold downs and SRB ignitors
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#1164
by
NASAAN101
on 16 Jul, 2008 02:34
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what are the ROFI's? like i say i heard those a fews seconds before lift-off and i've been intching at ask.
NIKKI
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#1165
by
sitharus
on 16 Jul, 2008 07:04
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what are the ROFI's? like i say i heard those a fews seconds before lift-off and i've been intching at ask.
NIKKI
There's an option in your forum preferences in Look and Layout called "Highlight items from Acronyms List", it'll put a tooltip on those acronyms. It's not right 100% of the time, but it's good enough to put in to google.
ROFIs are Radially Outward Firing Igniters, they're activated at T-10 iirc to burn off excess hydrogen gas beneath the SSMEs. The create the sparkler-like balls of flame you see.
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#1166
by
NASAAN101
on 16 Jul, 2008 14:48
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the first part to the question is "range safey systems are armed"
NIKKI
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#1167
by
Ford Mustang
on 16 Jul, 2008 16:12
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the first part to the question is "range safey systems are armed"
NIKKI
If you're asking what Range Safety Systems are (and I know I'm going to get nailed for posting a Wikipedia link, but it is accurate):
http://en.wikipedia.org/wiki/Space_Shuttle_Solid_Rocket_Booster#Range_safety_system"A range safety system (RSS) provides for destruction of a rocket or part of it with on-board explosives by remote command if the rocket is out of control, in order to limit the danger to people on the ground from crashing pieces, explosions, fire, poisonous substances, etc."
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#1168
by
NASAAN101
on 16 Jul, 2008 16:38
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OK, i heard those during discovery launch on May 31st, and i've been inching by brains try to get the meaning to thoses.. And just from perosnal reson i like Wikipedia.
NIKKI
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#1169
by
brahmanknight
on 18 Jul, 2008 21:01
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Where exactly in the cabin are the seats stored while in orbit?
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#1170
by
Jim
on 18 Jul, 2008 21:20
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many places
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#1171
by
brahmanknight
on 20 Jul, 2008 03:56
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When the shuttle landed at EAFB with LDEF or another retrieved payload, does the payload stay in the cargo bay until the shuttle arrives back in Florida?
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#1172
by
DaveS
on 20 Jul, 2008 10:16
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When the shuttle landed at EAFB with LDEF or another retrieved payload, does the payload stay in the cargo bay until the shuttle arrives back in Florida?
Yep. No clean-rooms at DFRC or the required equipment to move the doors.
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#1173
by
C5C6
on 21 Jul, 2008 16:11
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when the orbiter leaves the ISS, the flyaround trajectory appears to be a circle in the videos....
wouldn't consume less fuel making a rhombus trajectory?? because in order to mantain the circle-like trajectory, the orbiter needs to make small burns constantly...instead, it could travel in a straight line and burn only for the 90º turn on each vortex of the rhombus.....
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#1174
by
Jorge
on 21 Jul, 2008 16:26
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when the orbiter leaves the ISS, the flyaround trajectory appears to be a circle in the videos....
wouldn't consume less fuel making a rhombus trajectory?? because in order to mantain the circle-like trajectory, the orbiter needs to make small burns constantly...instead, it could travel in a straight line and burn only for the 90º turn on each vortex of the rhombus.....
Incorrect. Orbital mechanics wants to drive the trajectory into an ellipse. Current procedures force the trajectory into a circle to keep ISS centered in the overhead windows, which minimizes shuttle RCS plume impingement on ISS and maximizes visibility of the station to both the orbiter crew and the onboard sensors. The circle is not so different from the ellipse that it requires an excessive number of burns to maintain.
To attempt to fly straight lines would take more burns than is currently done, since orbital mechanics will send the orbiter into ellipses once the pilot goes hands off. It will therefore increase propellant consumption, not decrease. It would also result in intervals where ISS is not centered in the orbiter overhead windows, resulting in increased plume impingement, compromised crew visibility, and limited availability of sensor (TCS, HHL) data.
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#1175
by
C5C6
on 21 Jul, 2008 16:44
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wow!! thank you jorge!!!!!!
actually, I find this hard to understand....I tried to visualize it forgetting that both vehicles weren't orbiting, and only considering them in vaccum and zero G......and only thought of relative motion between them.....in this case what i said would be correct -although what you said about visibility would still be an issue-??
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#1176
by
DMeader
on 21 Jul, 2008 18:19
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Whatever happened to LDEF?
I know it was retrieved and the experiment trays removed and studied, but what was done with the spacecraft (or spaceframe or bus or whatever it was called) itself?
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#1177
by
rdale
on 21 Jul, 2008 19:00
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#1178
by
Jorge
on 21 Jul, 2008 19:04
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wow!! thank you jorge!!!!!!
actually, I find this hard to understand....I tried to visualize it forgetting that both vehicles weren't orbiting, and only considering them in vaccum and zero G......and only thought of relative motion between them.....in this case what i said would be correct -although what you said about visibility would still be an issue-??
That is correct. In the absence of a gravitational field, the vehicles would coast in straight lines, but the problems with plume impingement, visibility, and sensor availability would remain.
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#1179
by
Antares
on 23 Jul, 2008 02:10
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OBMR? Over Board Mixture Ratio. Is this as opposed to chamber mixture ratio? (So it would count all effluent from drains, etc.?)