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Project Apollo - NASSP 6.4.3 released!
http://nassp.sf.net
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Author Topic: Apollo 8 TLI in version 6.4.3  (Read 1128 times)
brittany_Apollo8_fan
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brittanystruth
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« on: August 03, 2006, 11:44:55 AM »

I installed the NASSP version 6.4.3 on a laptop to play around with, while I travel.  I tried the Apollo 8 scenario, but the TLI didn't work out well.  How do I do TLI with the Transfer MFD?   I tried the tutorial at http://www.jdkbph.com/ALMT/ but it didn't work.

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"All we do is open the valves and Frank comes home."

Chris Kraft, talking to Susan Borman about her concerns that Apollo 8 would be stranded in lunar orbit.
"From the Earth to the Moon"
almostfm
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« Reply #1 on: August 03, 2006, 11:23:07 PM »

I installed the NASSP version 6.4.3 on a laptop to play around with, while I travel.  I tried the Apollo 8 scenario, but the TLI didn't work out well.  How do I do TLI with the Transfer MFD?   I tried the tutorial at http://www.jdkbph.com/ALMT/ but it didn't work.



Brittany,

  Obviously, I'm new here, but I had the same problem.

  My understanding is that if you do TLI with the Transfer MFD, the burn is purely prograde, and the Apollo 8 orbit isn't in the same plane as the moon's orbit so you miss the moon, unless you do a huge plane change burn on the way out.

  I use the IMFD, and do an "Off-Plane Intercept", and let it do an "autoburn" which gives me the out of plane component that I need (I just tell myself that it's Mission Control sending the burn data to the SIVB IU, which I understand it how it really happened).  Then, I just need a couple of small MCC's to get things "cleaned up"

If you look at http://www.ibiblio.org/mscorbit/mscforum/index.php?topic=347.15, Tschachim has a nice description of how to do it.  I've managed to get to LOI within about 20 minutes of the historical time, and with about 95% fuel left in the SM when it came time for LOI, and ended up with a pretty decent lunar orbit (about 70 X 110 miles, and a 165 deg inclination).
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