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Author Topic: Apollo 8 vAGC earth reentry difficulty  (Read 14819 times)
meik84
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« Reply #45 on: June 12, 2011, 12:35:55 PM »

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rs. Final result was a splashdown 4.7 nm from the P37 perdicted splashdown coordinates.
That's close. Not very good, but good. Whatever's wrong, it's nothing big. I'll see what I can do.
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Also note that the EMS range to go was displaying approx 350 nm at the moment of P67 16 67 display.
In minus, I guess? I've got the same problem. There must be something wrong with the EMS.
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eddievhfan1984
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« Reply #46 on: June 12, 2011, 03:47:22 PM »

I just finished with an early reentry from Apollo 7. I was able to get within 1nm, according to the readout. IDK how it happened, though.
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lauderj
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« Reply #47 on: June 12, 2011, 09:14:39 PM »

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Also note that the EMS range to go was displaying approx 350 nm at the moment of P67 16 67 display.
In minus, I guess? I've got the same problem. There must be something wrong with the EMS.

No, actually it was positive. The EMS continued to count down the range after 16 67 until I turned it off per check list. I believe it ran down to around 200 when I turned it off.

I just finished with an early reentry from Apollo 7. I was able to get within 1nm, according to the readout. IDK how it happened, though.
Interesting. I'll think I'll try an Apollo 7 reentry next and see what I get.
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meik84
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« Reply #48 on: June 13, 2011, 12:33:40 PM »

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I just finished with an early reentry from Apollo 7. I was able to get within 1nm, according to the readout. IDK how it happened, though.
With my last EMEMs? It'd be good to see that others can reproduce what I'm doing. Not that I forgot something... Wink
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No, actually it was positive. The EMS continued to count down the range after 16 67 until I turned it off per check list. I believe it ran down to around 200 when I turned it off.
Confused That's interesting. All my entries (Apollo 7 & 8 ) were 'too long' from the EMS side. Maybe there's really something wrong with your scenario...
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eddievhfan1984
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« Reply #49 on: June 13, 2011, 01:20:49 PM »

No, I touched none of the EMEMs. However, before the reentry test (which I tried about an hour after the SIVB phasing maneuver), I called a V36 ("fresh start") unintentionally, and I had to reset my drift and REFSMMAT flags and do a P52, option 3 beforehand. I used P37, only one iteration, SPS burn, and let the CMC control reentry. At the point suggested by the reentry checklist, I took manual control and followed the roll command myself as close as possible.
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meik84
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« Reply #50 on: June 13, 2011, 02:08:11 PM »

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No, I touched none of the EMEMs.
When the 'Apollo 7 Virtual AGC.scn' you used is from Jun 6th, you are using my EMEMs. Happy Tschachim has already zapped it up in CVS, I forgot. Ashamed
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I called a V36 ("fresh start") unintentionally, and I had to reset my drift and REFSMMAT flags and do a P52, option 3 beforehand. I used P37, only one iteration, SPS burn, and let the CMC control reentry.
That shouldn't do severe harm to your SV. Did the CMC splashdown coordinates (those flashing V16N67) agree with the one in PAMFD? One iteration of P37 is also no problem -the procedure in the G&C checklist won't work in earth orbit anyhow.
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At the point suggested by the reentry checklist, I took manual control and followed the roll command myself as close as possible.
You mean at flashing V16N67? That's okay, the CM is so slow at this point that rolling around won't do anything significant. When it's over, it's over -there's no go around and try again. Except you install wings and jet engines on the CM, though... Happy
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eddievhfan1984
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« Reply #51 on: June 17, 2011, 01:46:53 PM »

Well, I did a replay, here are my notes:

6.32 N
160.93 E

13m32.29s from ignition to EI
25,773fps at EI
1.67 gamma

burn time: 3:59:47.47
EI: 4:13:19.76

I've also included a screenshot of my DSKY at splashdown. The RTOGO was changing between .2 and .6nm, so I just split the difference and called it at .4. I forgot to cross-check with the PAMFD, but  I'm confident the CMC made it.


* A7luck.png (338 KB, 1280x720 - viewed 172 times.)
« Last Edit: June 17, 2011, 02:38:51 PM by eddievhfan1984 » Logged
meik84
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« Reply #52 on: June 19, 2011, 04:22:20 PM »

Great! Very Happy
Could you do me a favour and look in your quicksave and verify if you flew with the EMEMs mentioned above? We could put this entry stuff ad acta then... Happy
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eddievhfan1984
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« Reply #53 on: June 19, 2011, 06:32:42 PM »

Which registers do you need?
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meik84
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« Reply #54 on: June 20, 2011, 03:58:55 AM »

That'd be:

EMEM3007 6632
EMEM3010 3146
EMEM3011 74344

When you flew with the newest 'Apollo 7 Virtual AGC.scn' as starting point, you should have them.
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eddievhfan1984
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« Reply #55 on: June 20, 2011, 04:48:37 AM »

Check that. I got them.
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