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Author Topic: DGII ascent profiles, flight dynamics  (Read 2955 times)

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Kell Bengal

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12 June 2003, 14:00:04
Greetings all,

         I'm currently trying to develop some ascent profiles to feed into the DGII autopilot.  Has
anyone done this before for a generalised set of altitudes?  Ideally, I'd like to end up with a set of
'900 series' programs - the entered program code would be a 9- followed by the target orbit altitude
/10K.  So, the standard  210K orbit program would become Pro921SpecXX.  You get the general idea.

         Failing, that can someone tell me the flight dynamics parameters of the DGII necessary to
compute ascent pitch values?  I know these are vague questions, but I'm hoping someone can help me out.

         take care,

           -Kell


Offline DanSteph

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Reply #1 - 12 June 2003, 17:51:14
Hello,

I'm affraid you must relly on the good old "try & error" method.
modify the number in your pilot until it give the result you want.

be warned that the atmospheric flight dynamic may change in the
incoming version of orbiter so the autopilot is likely to change also.

The next version of DGII will come out in about the same time than
the next orbiter version. (don't ask me when , I don't know)

Dan


Kell Bengal

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Reply #2 - 13 June 2003, 09:03:38
Thanks for the advice.  I guess it'll just take some educated guess and patience to get it right.
Vinka's webpage has some preview work on a launch calculator, but that's only for airless planets, I think.

I'll be keeping an eye out for any developments in pre-flight calculation.

      -Kell


Offline DanSteph

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Reply #3 - 13 June 2003, 11:32:10
Modifying sligtly the number should not be that difficult
for example keeping the pitch higher for a longer time
if you target an higher altitude....
Writting new pilot's number for mars took me two hours
(from scratch, mars is too different)

Good luck,

Dan


Offline canadave

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Reply #4 - 13 June 2003, 17:52:23
Dan--you have an ascent autopilot for Mars????  Là où est il????  You been holding out on us
again??? Or did you make it generally available, and I've just been asleep? :P

Dave


Offline Michelle Megan

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Reply #5 - 13 June 2003, 19:09:06
Agreed :)

Please upload PRO 903 SPEC MARS soon ;)

Et pour la lune aussi ;)

Michelle

« Last Edit: 13 June 2003, 21:04:16 by Michelle Megan »
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Offline DanSteph

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Reply #6 - 13 June 2003, 21:04:16
Ok I will give the link to it in this thread when I come back to home
in about two hours....
For the moon sorry I don't have it yet... (I almost never
fly on the moon this explain why I don't have an autopilot
for it)

(This said I don't know it the "PRO904" for mars will work on the
11 march version you have I remember having modified some
pilot programing but don't recall if it was before or after
the last release.... anyways I will test this and write here the
result or give the link)

Dan

« Last Edit: 13 June 2003, 21:04:16 by DanSteph »