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Project Apollo Beta 7.0 released!
http://nassp.sf.net/wiki/Installation
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Author Topic: Earth Orbit Sep  (Read 924 times)
kerlix
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« on: April 28, 2014, 03:59:16 PM »

The Word Checklist calls for computing the docking attitude for AP7 vAGC.

My question is:

What does

R22 = 315* - R20
P22 = P20 + 180*
Y22 = 360* - Y20

What does R20, P20 and Y20 mean? Is that some sort of addition taking place? Or does it simply mean "315* - current roll angle? Etc..
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almostfm
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« Reply #1 on: April 28, 2014, 05:45:26 PM »

You actually answered your own question Thumbs Up  It's the three angles you get (roll, pitch, yaw) if you do a v16n20.

Those are the three angles for the CSM (and by extension, the SIVB) before you separate.  After separation, you want to rotate the CSM to the R22, P22, and Y22 angles that you've calculated--that way, you'll be in the proper orientation for docking.
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eddievhfan1984
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« Reply #2 on: May 01, 2014, 05:41:37 AM »

Yeah, Noun 22 stores the gimbal angles that drive the error needles, IIRC.
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