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abr35
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« on: January 16, 2011, 12:05:24 PM »

I started drafting up articles on the SCS for the Project Apollo wiki, using the Apollo Operations Handbook as reference. I've run into two roadblocks though:

1) The AOH says that the EMS .05g switch puts the GDC into Entry mode. How does entry mode differ from euler mode?

2) I can't post anything on the wiki! It's not sending me any conformation e-mail. Is there someone I should send the documentation to?
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Tschachim
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« Reply #1 on: January 19, 2011, 04:42:03 AM »

2) I can't post anything on the wiki! It's not sending me any conformation e-mail. Is there someone I should send the documentation to?

No, I need to activate your account. I'll do ASAP, but it might take some days due to real life constraints...
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Tschachim
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« Reply #2 on: January 19, 2011, 08:29:28 AM »

I started drafting up articles on the SCS for the Project Apollo wiki, using the Apollo Operations Handbook as reference.

By the way, great!  Thumbs Up Wink

1) The AOH says that the EMS .05g switch puts the GDC into Entry mode. How does entry mode differ from euler mode?

I can't explain it properly, but it adds some of the roll BMAG input to the yaw rate. Just in case you can read C code, from GDC::Timestep in scs.cpp:

Code:
// Handling for .05G Switch:  According to AOH SCS Section 2.3.3.3.1...
// "...selecting backup rate (BMAG1) in yaw will automatically select the backup rate gyro (BMAG 1) in roll and vice versa..."
if (sat->GSwitch.IsUp() && (sat->BMAGPitchSwitch.IsDown() || sat->BMAGRollSwitch.IsDown())) {
rollBmag = &sat->bmag1;
yawBmag = &sat->bmag1;
}

AttitudeReference::Timestep(simdt);

rates.x = pitchBmag->GetRates().x;
// Special Logic for Entry .05 Switch
if (sat->GSwitch.IsUp()) {
// Entry Stability Roll Transformation
rates.y = rollBmag->GetRates().z*tan(21.0*(PI/180)) + yawBmag->GetRates().y;
// sprintf(oapiDebugString(), "entry roll rate? %f", rates.y);
} else {
// Normal Operation
rates.y = yawBmag->GetRates().y;
}
rates.z = rollBmag->GetRates().z;

2) I can't post anything on the wiki! It's not sending me any conformation e-mail. Is there someone I should send the documentation to?

Your account should be active now, please post or PM me if it isn't working.

Cheers
Tschachim
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abr35
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« Reply #3 on: January 21, 2011, 04:54:28 PM »

Thank you very much. Happy The SCS stuff I wrote up should be on the wiki. The BMAG article could stand to be fleshed out a bit, and I need to upload some images (attitude control chart and deadband charts from AOH, panel diagrams, etc) I'll take care of all that when I have the time. Other than that, if anyone sees any errors feel free to point them out. The AOH can make my head spin  ROTFL

I'll take care of any revisions as they crop up. Meanwhile, I'll try to tackle another system. Which ones are highest on the list of priorities?
« Last Edit: January 21, 2011, 04:56:24 PM by abr35 » Logged
Tschachim
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« Reply #4 on: January 25, 2011, 07:13:04 AM »

I just skimmed through the articles, looks great!  Thumbs Up Happy

Meanwhile, I'll try to tackle another system. Which ones are highest on the list of priorities?

I'd say the RCS, the existing stubs are here: http://nassp.sf.net/wiki/Category:Reaction_Control_System_%28CSM%29

Thanks for your help, this helps us a lot  Happy

Cheers
Tschachim
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abr35
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« Reply #5 on: January 29, 2011, 11:37:36 AM »

I just skimmed through the articles, looks great!  Thumbs Up Happy

Thanks! Glad to help. You guys got a virtual-North American going on here   Thumbs Up
Things have been busy lately. I'll start on the RCS when I get the time.
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abr35
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« Reply #6 on: March 17, 2011, 02:02:11 PM »

The Service Module RCS documentation is up on the Project Apollo wiki. Diagrams and CM-RCS stuff will follow shortly. If anyone notices any errors/omissions please feel free to point them out so I can make changes. Just two questions for anyone who can answer:
A) Are start and shut-off transients implemented in the current NASSP?
B) I made the assumption that they are a result of the fuel and oxidizers mixing and depleting. Is that correct?
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Tschachim
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« Reply #7 on: March 23, 2011, 07:03:01 AM »

A) Are start and shut-off transients implemented in the current NASSP?

No.

B) I made the assumption that they are a result of the fuel and oxidizers mixing and depleting. Is that correct?

I suppose, you might want to take a look at AOH Part 1 Page 2.5-16ff

Cheers
Tschachim
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abr35
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« Reply #8 on: May 27, 2011, 10:38:40 AM »

OK, the SM and CM RCS articles are up on the wiki, along with one on the PGNCS. I tried to be as thorough as possible, but the PGNCS is extremely complex so I may have missed a spot or two, and I'll address any errors as they come up. So what's at the top list of priorities now? I read elsewhere that the actual Apollo 7 flight needs to be documented, and I could tackle that unless something else is more pressing. How would documenting it differ from the excel flight plan included in the CVS snapshot?

Thanks
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meik84
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« Reply #9 on: May 27, 2011, 05:18:48 PM »

Quote
so I may have missed a spot or two, and I'll address any errors as they come up.
You missed the RCS CMD and RCS TRNFR switches. Or do you count them to the SECS? Apart from that: nice work. I'd have explained more -and nobody would understand anything. Wink
Quote
but the PGNCS is extremely complex so I may have missed a spot or two
Don't worry. The complex thing of the PGNCS is not the hardware, but the software. We rather need a wiki-article on every program...
Quote
How would documenting it differ from the excel flight plan included in the CVS snapshot?
I think we should drop the excel flight plans. We've quite good word checklists for the bread-and-butter tasks (P30s, P40s...), so the new flight plans should be as brief as the real ones: GET of the maneuver, target trajectory parameters. This here -> http://history.nasa.gov/ap07fj/pdf/HSI-33608.pdf is the real one from Apollo 7, just as an example.
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Tschachim
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« Reply #10 on: May 31, 2011, 05:10:14 AM »

Great job, abr35!  Thumbs Up

I'm not sure about what's next at best, I'll think about it, but feel free to write about what you like!
AFAIR the RCS CMD and RCS TRNFR switches belong to the RCS, so you might what to explain them there.

The complex thing of the PGNCS is not the hardware, but the software. We rather need a wiki-article on every program...

Good idea!

I think we should drop the excel flight plans.

If you're refering to the "Doc\Project Apollo - NASSP\Flightplans" you're right, in fact they aren't maintained already since some time. The word checklists are fine so far, more important are the excel checklists (Doc\Project Apollo - NASSP\Checklists). They are used by Checklist MFD to provide in-game checklists with switch highlighting etc., also they are the "scripts" for Quickstart Mode. But they are hard to write and often one need to do code changes to get them to work properly (and in Quickstart Mode automatically), which is what I'm working on (when I have some time left...).

But we also need a kind of tutorial for Apollo 7 in the wiki with more text and explanations than the checklists provide, especially about the manoeuvers / burns, an entry point would be here: http://nassp.sourceforge.net/wiki/Apollo_7 (I'm not sure if the text in "Rendezvous Maneuvers" is correct). I'd start with the VAGC mode, Quickstart Mode can be done later and you probably want to split such a mission tutorial in serveral articles, but these are just my 2ct...  Happy

Cheers
Tschachim
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abr35
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« Reply #11 on: May 31, 2011, 01:01:19 PM »

You missed the RCS CMD and RCS TRNFR switches. Or do you count them to the SECS?

I put the TRNFR switch in the CM RCS article, I think. The RCS CMD switch is in the SCS but I can move that over to the SM RCS article. As for the SECS, being there was some information on the wiki and the AOH chapter on that system is so lengthy I figured I just won't touch it for the time being and attack it later. My main focus will be on the making articles for the CMC programs and Apollo 7.
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