Question Q/A's FOR STS - Page 6 - Orbiter-Forum

orwellkid · 07-01-2008, 04:37 AM

Ghosts in the OMS engines.

Pilot7893 · 09-04-2008, 12:06 AM

Does the crew feel any Gs during OMS burns?

**Donamy** · 09-04-2008, 12:24 AM

Not so much, but everything in the crew compartment, that isn't nailed down, moves in the opposite direction.

**tblaxland** · 11-17-2008, 01:18 AM

From the STS-126 thread:

Quote:

Originally Posted by Zatnikitelman

Small note about S-Band. It's where Wireless networks lie so it's not the physical limitations preventing a continuous stream, it's the systems that have to process it that limites the bandwidth.

It is not so much a limit of the systems, rather a limit due to signal to noise ratios (SNRs). Whilst the frequencies are similar (2.2GHz vs 2.4GHz) the SNR for the downlink from the shuttle is much worse than for a typical Wi-Fi link. Broadly speaking the signal is much smaller (due to distance) but the noise is about the same (See the Shannon–Hartley theorem for the effect of SNR on channel capacity). The S-band high data rate (using the quadrant antennas) is 192kbps consisting of two 32kbps voice channels and one 128kbps telemetry channel[1]. As far as I understand it, imagery can be sent down on the telemetry channel but telemetry obviously takes the bulk of that channel.

Ku-band gives better data rates because it operates at both high frequencies (15GHz) and at better SNRs (due to directional antenna). Data rates can be as high as 50Mbps[1].

[1] Human Space Flight Shuttle Reference Manual

ryan · 11-27-2008, 01:01 AM

Hey guys, can some one please find a list of all the Launch callouts on a space shuttle mission, like the Press to MECO and all that.

**tblaxland** · 11-27-2008, 04:05 AM

A large portion of them are covered in this thread:
http://orbit.m6.net/forum/Default.aspx?g=posts&t=17399

ElPelado · 11-27-2008, 08:18 PM

Hi
Does anybody have a list of all the calls during launch? All the calls regarding abort modes and "two-engines" or "single engine"
Thanks!

**tblaxland** · 11-27-2008, 10:06 PM

Quote:

Originally Posted by ElPelado

Hi
Does anybody have a list of all the calls during launch? All the calls regarding abort modes and "two-engines" or "single engine"
Thanks!

http://www.orbiter-forum.com/showthread.php?t=5550

**ripley1** · 05-09-2009, 03:17 PM

I know this is an old thread,but I just want to ask a question about the RCS thrusters on STS. How loud are they when fired and is the RCS sound in Orbiter accurate?

**Urwumpe** · 05-09-2009, 05:07 PM

The aft thrusters should be a bit more silent, but generally, they are rather too silent in Orbiter, than too loud.

Linguofreak · 05-11-2009, 01:42 AM

Here's a question:

Why is the LON mission for STS 134 listed as STS 135 instead of as a 3xx mission like the other LON's?

The LON for 126 was 119 because it just involved a modification of the 119 flight plan, and the LON for 125 will be 400, because it's a different mission type than the others, but what's so special about 134/135? Does it have something to do with 134 being the last planned mission?

**tblaxland** · 05-11-2009, 02:13 AM

Quote:

Originally Posted by Linguofreak

Does it have something to do with 134 being the last planned mission?

Yes, LON duties are STS-135's only mission. It looks like the STS-3xx series are only used if their is a corresponding primary mission.

ryan · 06-21-2009, 07:01 AM

Quote:

Originally Posted by ripley1

I know this is an old thread,but I just want to ask a question about the RCS thrusters on STS. How loud are they when fired and is the RCS sound in Orbiter accurate?

Theres an RCS firing in this movie, they start ten down pulses at 3:14.

YouTube - STS-125 Atlantis Hubble SM4 - Hubble Release [HD]

ryan · 06-23-2009, 04:15 AM

Hey guys, i saw a video of the crew of a shuttle mission testing the snares on the RMS, how exactly does that hold onto to objects large enough as Hubble or something, they only look like bits of wire.
Thanks.
Ryan.

**tblaxland** · 06-23-2009, 04:47 AM

Quote:

Originally Posted by ryan

Hey guys, i saw a video of the crew of a shuttle mission testing the snares on the RMS, how exactly does that hold onto to objects large enough as Hubble or something, they only look like bits of wire.
Thanks.
Ryan.

By moving slowly. From this page, I estimate the end effector acceleration at 0.01 '/s/s for a 32,000 lb payload. This equates to a force of 43 N, or about the force required to pick up a largish baby.

11-17-2008, 01:18 AM	#79
tblaxland Webmaster	Video over S-band From the STS-126 thread: Quote: Originally Posted by Zatnikitelman Small note about S-Band. It's where Wireless networks lie so it's not the physical limitations preventing a continuous stream, it's the systems that have to process it that limites the bandwidth. It is not so much a limit of the systems, rather a limit due to signal to noise ratios (SNRs). Whilst the frequencies are similar (2.2GHz vs 2.4GHz) the SNR for the downlink from the shuttle is much worse than for a typical Wi-Fi link. Broadly speaking the signal is much smaller (due to distance) but the noise is about the same (See the Shannon–Hartley theorem for the effect of SNR on channel capacity). The S-band high data rate (using the quadrant antennas) is 192kbps consisting of two 32kbps voice channels and one 128kbps telemetry channel[1]. As far as I understand it, imagery can be sent down on the telemetry channel but telemetry obviously takes the bulk of that channel. Ku-band gives better data rates because it operates at both high frequencies (15GHz) and at better SNRs (due to directional antenna). Data rates can be as high as 50Mbps[1]. [1] Human Space Flight Shuttle Reference Manual

11-27-2008, 01:01 AM	#80
ryan That guy	Space Shuttle Launch Callouts Hey guys, can some one please find a list of all the Launch callouts on a space shuttle mission, like the Press to MECO and all that.

06-23-2009, 04:47 AM	#90
tblaxland Webmaster	Quote: Originally Posted by ryan Hey guys, i saw a video of the crew of a shuttle mission testing the snares on the RMS, how exactly does that hold onto to objects large enough as Hubble or something, they only look like bits of wire. Thanks. Ryan. By moving slowly. From this page, I estimate the end effector acceleration at 0.01 '/s/s for a 32,000 lb payload. This equates to a force of 43 N, or about the force required to pick up a largish baby. Last edited by tblaxland; 06-23-2009 at 04:47 AM. Reason: Link added

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07-01-2008, 04:37 AM	#76
orwellkid Addon Developer	Ghosts in the OMS engines.

09-04-2008, 12:06 AM	#77
Pilot7893 Epik spaec mishun!	Does the crew feel any Gs during OMS burns?

09-04-2008, 12:24 AM	#78
Donamy Beta Tester	Not so much, but everything in the crew compartment, that isn't nailed down, moves in the opposite direction.

11-27-2008, 04:05 AM	#81
tblaxland Webmaster	A large portion of them are covered in this thread: http://orbit.m6.net/forum/Default.aspx?g=posts&t=17399

11-27-2008, 08:18 PM	#82
ElPelado Orbinaut	Hi Does anybody have a list of all the calls during launch? All the calls regarding abort modes and "two-engines" or "single engine" Thanks!

11-27-2008, 10:06 PM	#83
tblaxland Webmaster	Quote: Originally Posted by ElPelado Hi Does anybody have a list of all the calls during launch? All the calls regarding abort modes and "two-engines" or "single engine" Thanks! http://www.orbiter-forum.com/showthread.php?t=5550

05-09-2009, 03:17 PM	#84
ripley1 Donator	I know this is an old thread,but I just want to ask a question about the RCS thrusters on STS. How loud are they when fired and is the RCS sound in Orbiter accurate?

05-09-2009, 05:07 PM	#85
Urwumpe Donator	The aft thrusters should be a bit more silent, but generally, they are rather too silent in Orbiter, than too loud.

05-11-2009, 01:42 AM	#86
Linguofreak Orbinaut	Here's a question: Why is the LON mission for STS 134 listed as STS 135 instead of as a 3xx mission like the other LON's? The LON for 126 was 119 because it just involved a modification of the 119 flight plan, and the LON for 125 will be 400, because it's a different mission type than the others, but what's so special about 134/135? Does it have something to do with 134 being the last planned mission?

05-11-2009, 02:13 AM	#87
tblaxland Webmaster	Quote: Originally Posted by Linguofreak Does it have something to do with 134 being the last planned mission? Yes, LON duties are STS-135's only mission. It looks like the STS-3xx series are only used if their is a corresponding primary mission.

06-23-2009, 04:15 AM	#89
ryan That guy	Hey guys, i saw a video of the crew of a shuttle mission testing the snares on the RMS, how exactly does that hold onto to objects large enough as Hubble or something, they only look like bits of wire. Thanks. Ryan.