DGIII autopiolet program

[gimp1992]

Hi Im posting this for (BRODIE) :

 Hello! ive recently been going to the moon alot :P! what i wanted to do was launch - dock with ISS - THEN leave for the moon
laugh :D but because of the ISS' orbit this uses lots of fuel! So using the config files etc... I 'moved' the ISS into a
190x200km orbit at the the same inclination as the moon :P, the only problem is the defualt PRO903SPEC launch places me at
like 250x250 sad can someone please make me a launch profile that gets me to roughly 195km?? Remember the DGIIIs computer
will fix the ECC so dont worry about that laugh :D I would do this myself but wont be playing orbiter for a few days. I
usualy use a direct ascent to the ISS and can most of the time dock within 1 1/2 Orbits after MECO. so dont worry about
getting the DG in a catch up orbit :P

This is the ascent profile I have been using for my direct climbs to the ISS: i got it off Dan Stephs' forums, it puts me at
roughly 350x350 (using the mark IV Engine (the middle powered one :P (default i think))) So make sure you are using the same
engine as me wen testing or confusion will arise :P

PROGNAME: Direct ISS
TYPE: ASCENT
ALT: 300 PITCH: 10
ALT: 500 PITCH: 10
ALT: 1000 PITCH: 10
ALT: 1000 SNMSG: ENGAGE Turbo pump!
ALT: 1200 PITCH: 10
ALT: 1500 PITCH: 85
ALT: 40000 PITCH: 80
ALT: 48500 PITCH: 75
ALT: 57000 PITCH: 75
ALT: 84200 PITCH: 65
ALT: 128000 PITCH: 50
ALT: 152000 PITCH: 45
ALT: 210000 PITCH: 30
ALT: 250000 PITCH: 10
ALT: 280000 PITCH: 10
ALT: 300500 PITCH: 10
ALT: 310000 PITCH: 5
ALT: 320000 PITCH: 1
ALT: 330500 PITCH: 1
ALT: 340000 PITCH: 0
ALT: 345400 PITCH: 0
ALT: 350050 PITCH: 0
ALT: 360100 PITCH: 0
ALT: 400000 PITCH: 0
ENDPROG:

I would post this on Dan Steph's page but cant remember my password!

I appreciate the help guys :P thank you!

(by the way if you have any thoughts about my ISS set up please say, im planning to basically plan ejection - undock - tweak
Rinc - eject from earth! so is 190x200 the most efficient orbit for that?)

THANKS!

[moccakoenig]

Hi!

It's fun to read about this topic, because I'm just working at almost the same problem since a few days.

After I changed an ascent program, it showed not to work well (it decreases pitch angle to early).
So I started to think about a way to calculate the right angle for the right time, for the most efficient ascent.
As an engeneering student, I assumed that it must be possible, but after many hours of building differential equations,
I think, that it's not so easy.

My approach is to build two equations - one for the longitudinal direction of the ship, and one for the direction of
altitude. Each one comes from the balance of power (thrust = acceleration force + aerodynamic drag + part of gravity
forces). Especially the aerodynamics are a big problem, because I have to know the drag-factor of the glider, the
function of the air density over altitude, and the vessels mass over time, and so on.
While not having detailed data of the glider, I did some experiments (glide angle) and hope to get to a formula, wich I
can solve (maybe with the program MATLAB).

Getting a good ascent program by trying is also difficult, because of the aerodymics:
gain speed at low climb angle to use lift - or gain altitude at high climb angle to reduce time with drag?

I will come back, when I got some results (or desperately gave up *g*)