Wedge313
Well-known member
I tried two aborts, one using the PNGS and one using the AGS. This might turn out to be fun.....
As a starting point I picked a time right after P64 pitchover. I only did one of each so it's a small sample size, but few questions:
The PNGS abort resulted in an orbit 9.9 x 67.4 which seems to be setting me up for a direct rendezvous, while the AGS ended up in an 10.6 x 43.8 orbit which seems to be setting up for a coelliptic method. Is this the case? Is the PNGS programed to give me a different orbit than the AGS, or did these maneuvers just not work as planned?
I noticed using the AGS guidance the ascent stage had much less "wobble" and the RCS seemed to be firing much more rapidly. This is my first attempt at using the AGS as primary guidance, so is that how it works? The down side was after engine shutdown using AGS guidance the RCS kept firing steadily, it sounded like a stuck nozzle or two, in both Auto and ATT HOLD, and the only way I could figure out how to shut it off was by turning off the AGS Mode Control after nulling out the rates. What might be causing the constant RCS firing?
I will be playing around with this more, but after achieving orbit what would we do? I need to get the RR radar fired up and start figuring out the rendezvous. Could you guide me to the documents that discuss the various abort situations that might arrive? I'm just working off the LM AOH, the G&C checklist and the timeline. I would guess there's an explanation/discussion of aborts somewhere?
Thanks
As a starting point I picked a time right after P64 pitchover. I only did one of each so it's a small sample size, but few questions:
The PNGS abort resulted in an orbit 9.9 x 67.4 which seems to be setting me up for a direct rendezvous, while the AGS ended up in an 10.6 x 43.8 orbit which seems to be setting up for a coelliptic method. Is this the case? Is the PNGS programed to give me a different orbit than the AGS, or did these maneuvers just not work as planned?
I noticed using the AGS guidance the ascent stage had much less "wobble" and the RCS seemed to be firing much more rapidly. This is my first attempt at using the AGS as primary guidance, so is that how it works? The down side was after engine shutdown using AGS guidance the RCS kept firing steadily, it sounded like a stuck nozzle or two, in both Auto and ATT HOLD, and the only way I could figure out how to shut it off was by turning off the AGS Mode Control after nulling out the rates. What might be causing the constant RCS firing?
I will be playing around with this more, but after achieving orbit what would we do? I need to get the RR radar fired up and start figuring out the rendezvous. Could you guide me to the documents that discuss the various abort situations that might arrive? I'm just working off the LM AOH, the G&C checklist and the timeline. I would guess there's an explanation/discussion of aborts somewhere?
Thanks