Apollo 12 TEI Planning w/RTCC

[Wedge313]

Hello, A few questions about the Apollo 12 TEI.

When I went to the RTCC to plan this, I tried to follow the same procedure with the RTCC that I had used on other flights. In those cases I used TAR>ENT>AST, then for TYP I used Lunar Search, SIT was EOM, and then entered the flight plan times for TEI TIG and splashdown. Then I would click AST>CLC and it generate a solution. For this flight this didn't work for me, the RTCC wouldn't come up with anything. After playing around with it I found I could only get a reasonable solution if on the AST I went with TYP as Specific Site and SIT as MPL. Because I'm still learning how to use the RTCC, I'm not sure why the procedure seemed different to me this time.

The other question was on the DAP. I feel like I'm still playing "Where's Waldo" looking for the DAP settings. Coming up on the TEI burn the last setting I could find was back around 149:45, where they set R1 as 11112. I believe that puts the deadband at +/- 5 degrees, and that seems a little loose for the PC2 and TEI burns. Does running P40 tighten this deadband? Did I miss a DAP change? Or is +/- 5 degrees good enough for these burns?

Thanks

 

[rcflyinghokie]

When I went to the RTCC to plan this, I tried to follow the same procedure with the RTCC that I had used on other flights. In those cases I used TAR>ENT>AST, then for TYP I used Lunar Search, SIT was EOM, and then entered the flight plan times for TEI TIG and splashdown. Then I would click AST>CLC and it generate a solution. For this flight this didn't work for me, the RTCC wouldn't come up with anything. After playing around with it I found I could only get a reasonable solution if on the AST I went with TYP as Specific Site and SIT as MPL. Because I'm still learning how to use the RTCC, I'm not sure why the procedure seemed different to me this time.

You want to use MPL for Apollo 12 as it did not use different EOM coordinates.

The other question was on the DAP. I feel like I'm still playing "Where's Waldo" looking for the DAP settings. Coming up on the TEI burn the last setting I could find was back around 149:45, where they set R1 as 11112. I believe that puts the deadband at +/- 5 degrees, and that seems a little loose for the PC2 and TEI burns. Does running P40 tighten this deadband? Did I miss a DAP change? Or is +/- 5 degrees good enough for these burns?

P40 will tighten the deadband so you dont need to worry about it. The final trim on F 50 18 will be using tighter deadbands.

You can also tighten it before if you like, there no hard set dap requirements here as the astronauts did change them as necessary for different maneuvers etc. But yes, P40/41 will automatically tighten the deadbands.

The DAP settings in the flight plan were mostly for fuel conservation for long periods or specific tasks, but again were not "hard" values