Is there a way of changing the direction in which the autopilot takes off (I'm using the Shuttle Fleet 4.0 add-on)? I'm not too savvy with Orbiter, but I seem to remember that in the game, the ISS has an inclination of about 70, whilst IRL its more like 54. I think the launch autopilot for the Shuttle in Orbiter is set up so that it launches into an inclination of 70ish (the inc of the ISS in the sim). I was wondering if there was anyway of changing this, as I like to use the Scenario Editor to change the inclination of the ISS to what it is IRL. Obviously then, it messes with the autopilot of the Shuttle.
Launch heading of Shuttle Fleet
- Thread starter pandadude
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astrosammy
Dash!
You have to edit the scenarios (Orbiter\Scenarios\Shuttle Fleet V4.0.0).
This must be changed:
35.000 is the heading, and 228 the altitude.
This must be changed:
Code:
TGT_HEADING 35.000 228.0ar81
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Or you can use this
[ame="http://www.orbithangar.com/searchid.php?ID=2746"]Shuttle fleet scenario generator v1.5c[/ame]
[ame="http://www.orbithangar.com/searchid.php?ID=2746"]Shuttle fleet scenario generator v1.5c[/ame]
Ah very nice. I just realised there were quite a number of inaccuracies in my original post, but looks like you managed to understand what I was getting at 
I assume when setting the altitude that the autopilot will take you to, you can't change it that much due to fuel limitations and the limitations of the Shuttle in general?
I assume when setting the altitude that the autopilot will take you to, you can't change it that much due to fuel limitations and the limitations of the Shuttle in general?
astrosammy
Dash!
Yes, shuttle fleet sets the altitude back to 228 when it's under 183 or over 310.
Does this look right?
TGT_HEADING 90.000 300.0
It's just that when I tried that on Discovery, I had a few problems. Heading was all good but the altitude wasn't. What happened was the ApA was only about 250km, whilst PeA was about 50, obviously well inside the Earth's atmosphere. Those were the values I got after the autopilot had done its thing.
So is that meant to happen? Is 250 pretty much the limit? Or is that just the limit of the autopilot, and I'm meant to manually raise my PeA once I reach the ApA? Or am I just doing something wrong
Thanks for all the help, you guys are way smarter than me, no way I'd figure out half the stuff to do with Orbiter without these forums
TGT_HEADING 90.000 300.0
It's just that when I tried that on Discovery, I had a few problems. Heading was all good but the altitude wasn't. What happened was the ApA was only about 250km, whilst PeA was about 50, obviously well inside the Earth's atmosphere. Those were the values I got after the autopilot had done its thing.
So is that meant to happen? Is 250 pretty much the limit? Or is that just the limit of the autopilot, and I'm meant to manually raise my PeA once I reach the ApA? Or am I just doing something wrong
Thanks for all the help, you guys are way smarter than me, no way I'd figure out half the stuff to do with Orbiter without these forums
zerofay32
Buckeye
You have to raise the PeA with a OMS 2 burn. This is how it is done in real life. Also, in the scenario file, in the shuttle part, look for a line called PROFILE <0 or 1>. PROFILE 0 is the modern Direct insertion profile with a heads up roll. PROFILE 1 is the original heads down profile that requires a OMS 1 burn for orbit insertion. Now if the line is missing then the default profile is profile 0. If your useing profile 1 then the altitude line is ignored. But I don't thing this is the issue as most files in Shuttle fleet use the modern profile.
Another thing is payload weight. If you have a payload then the weight is added to the shuttle and will make it harder to reach higher orbites, again like if real life. To help with this the shuttle uses its OMS engines during the assent to give it an extra boost. In the shuttle code of the scenario add the line
ASSIST <xxx> <yyy>
Place the Start time in seconds MET in place of <xxx>, and the burn length in seconds in place of <yyy>. This is gone over in detail in the Shuttle Fleet manual in your "Add-on Docs" folder under the name "Shuttle Fleet V4.0.0 Manual". Look at pages 9 and 10 for all the things defined in the scenario file. Hope this helps.
Zerofay32
Another thing is payload weight. If you have a payload then the weight is added to the shuttle and will make it harder to reach higher orbites, again like if real life. To help with this the shuttle uses its OMS engines during the assent to give it an extra boost. In the shuttle code of the scenario add the line
ASSIST <xxx> <yyy>
Place the Start time in seconds MET in place of <xxx>, and the burn length in seconds in place of <yyy>. This is gone over in detail in the Shuttle Fleet manual in your "Add-on Docs" folder under the name "Shuttle Fleet V4.0.0 Manual". Look at pages 9 and 10 for all the things defined in the scenario file. Hope this helps.
Zerofay32
Your original post referenced an inclination of ~70 degrees for the ISS; the default frame of reference in Orbiter is the ecliptic frame of reference, not equatorial (i.e., referenced to Earth). In fact the ISS is inclined ~51.6 degrees in the proper frame of reference. Check the manual for how to change the frame of reference in the Orbit MFD display.
