Apollo 12 MCC1 with the Apollo RTCC MFD


Apr 11, 2018
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I am trying to do the apollo 12 mission, to see if I can at least reach the moon. So I decided to do apollo 11 too, to see if I can create the same Mission control PADs on Apollo RTTC MFD, so I could apply the same procedure on apollo 12. So I'm trying to do MCC1 on apollo 12,by trying to create a similar pad on MCC2 from apollo 11 (MCC1 got scrubed). But with the procedure I'm trying, the values of Pad P30 are always different. I did like this:
First I went to "Translunar" TLMCC option 1 and inserted the same Tig. After pressing “calculate”, i got a higher dV.


After that, "Utility" and REFSMMAT with Heads Up option. It got the same dV that were already there.


Then I went to do the calculation of P30 maneuver PAD and got very different values, in attitude and others. Only the dVs are close.


Even if I use in REFSMMAT, the option P30 (retro), the values are not the same too. I tried using other variants of REFSMMAT but the result is still different.
In these attempts and doing the same thing I just said,for some reason sometimes the dV is calculated almost equal to the mission control pad.


Can you give some help?

And another question I wanted to ask, is about the necessary uplinks after I made the Pad P30 Correct.


I think i will have to uplink the State Vector, external dV update and REFSMMAT. Is this correct?



Addon Developer
Addon Developer
Oct 26, 2011
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You are using the wrong TLMCC option for MCC-2. What you are calculating is option 1, which just targets the preflight latitude, longitude, altitude and time of pericynthion. What you should use is option 2, which reoptimizes the total DV of the midcourse correction plus LOI-1. So just press MAN once to switch to option 2, input the TIG and calculate. The general rule was to use option 2 for MCC-1 and MCC-2 calculations and option 1 for MCC-3 and MCC-4. Option 2 also calculates new targets to be used by option 1, they get saved and loaded by the RTCC MFD if you have the MFD open when you close Orbiter. I'll come up with a better system eventually, but for missions flown with the RTCC MFD you should just keep the MFD open at all times.

Then about the REFSMMAT, Apollo 10 and later use a PTC REFSMMAT for the translunar phase, not a preferred (P30) REFSMMAT that results in all 0° IMU angles. Apollo 10 and 11 used a weird format for the PTC REFSMMAT, which currently can't be calculated with the MFD. In the MCC I have hardcoded it (and I still am not 100% right it is the correct REFSMMAT actually). For Apollo 12 and later the MFD option to calculate the PTC REFSMMAT can be used and it even has the time associated with the REFSMMAT preloaded for the REFSMMAT page. So you should be able to calculate that quite easily, just not for Apollo 10 and 11.

If you are going to uplink a REFSMMAT then it should be uplinked last, yes. Otherwise it gets overwritten by other uplinked data (I figured this out the hard way). But for MCC-2 there was no REFSMMAT uplink, the PTC REFSMMAT was always uplinked a lot earlier. For these uplink times you can consult the flight plan for each mission.


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Mar 14, 2010
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Just to add my 2 cents.
If you want to follow the trajectory as flown on any of the missions, you can conveniently use option 1 using the coordinates given on the mission reports.

If you're trying for the ideal trajectory as planned before the mission, then go ahead and follow indy's recommendation. The default values in RTCC MFD should already be defaulted to the planned trajectory; Just update the GETI
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