Does PEG-4 even work in SSU currently? I tried it in the past but none of the MNVR EXEC displays would accept any PEG-4 ITEM inputs.
If you can confirm PEG-4 works ok then I'll try with that
---------- Post added at 11:17 AM ---------- Previous post was at 10:42 AM ----------
A ~14NM perigee matches the ~300fps burn, so it must be correct.
So I feel like I am running around in circles now
To summarize:
1) BURN: it seems to be good: DV around 300 fps gives me a matching 14NM Perigee.
This is also pretty much the same DV required for a tipical ISS mission deorbit burn, so if SSU is accurate it cannot be that different from 300 fps and if I need, let's say a lower DV with a higher Perigee to adjust the reentry angle (as Dave suggested) then it means maybe something is not right with SSU behaviour, given that Orbiter physics are accurate.
2) TIG: The deorbit burn point is also confirmed to be ok, as per L2 forum data. SSU orbit is almost identical to the real one and the burn happens at the actual TIG it was done.
3) R.E.I. : the SSU Range is 1000NM higher than it should be. IF the above data are correct there is still margin for some errors but how can it lead to such a wrong reentry profile? Now, looking at the problem from the opposite side I know how to make a perfect SSU reentry hitting EI at 4200NM followed by an automatic flawless glide down to the RWY, but to do that the deorbit burn must be done a LOT closer to the landing site (TIG done much later than the real one). By doing this I am happy with SSU performance in Orbiter but I am far away from a realistic reentry..
So the question is: have you done any succesful deorbit using the same parameters and targets they guys at NASA did? If so, how can I do that?
Thanks for your support