BaseSync AeroBrake Questions

[tblaxland]

WDND? (What does Nasa Do) for shuttle reentry? What is a typical real procedure? AoA, deorbit burn location...etc?

I suggest getting AFCS and ShuttleFleet and watch it do an automatic reentry. That will give you a pretty good idea.

 

[Dambuster]

Ok, I'm about to try another re-entry, on a clean install of Orbiter with the DG IV (the last few times I had a CTD with the XR1 as I was turning prograde).

Currently, I'm wondering what the ANT actually is? Also, why is it that in the box where you enter a value for it, it shows a recommended value far lower than what was given earlier in this thread?

Thanks,
Dambuster

 

[Belisarius]

As I understand it, ANT is anticipation of how many degrees ahead of the re-entry interface (altitude around 100km) you wish to do the re-entry burn.
Values of 3-6º seem to give a normal result.

Since you're going to use BaseSynch for the deorbit burn, I recommend AeroBrake MFD for the re-entry part. You can deselect the BaseSynch after doing the burn, then as you're turning prograde/level wings, select AeroBrake. Enter the same TARGET as before, then switch PG (page) PROJ (projection) and MOD twice. This should give you a nice map of the world with your trajectory marked in green and the target marked in yellow.
After switching on the autopilot PRO104SPEC40 you can press keypad 2 and 8 to change the AoA and see the effect this has on your trajectory.
In my experience the AeroBrake undercalculates the braking action a bit, so you could open the speedbrakes (B key) around 300 km out from your destination (if you're still alive that is).

Finally, if you find this all a bit tough, try reentry over Mars instead. Enjo has a terrific playback tutorial with complete documentation here:
[ame="http://www.orbithangar.com/searchid.php?ID=2434"]Mars atmospheric entry and landing playback[/ame]

 

[Dambuster]

Ok, on my last attempt everything worked well except for that I would up overshooting the target base by a very long way (so perhaps around a full length of Florida away from the base). Do you have any idea why this is and how I should fix it?

So far I've been using the BaseSync MFD for most stuff, although I have the Aerobrake one open (I just don't do anything with it).

 

[ar81]

See [ame="http://www.orbithangar.com/searchid.php?ID=3428"]Tutorial: Concepts for atmospheric reentry[/ame]

 

[PaulG]

Yes, the problem is that this is too basic and my questions were more specific.

See Tutorial: Concepts for atmospheric reentry

 

[Dambuster]

Yes, the problem is that this is too basic and my questions were more specific.

Same here.