Project Soyuz 7k.dll

[4throck]

Meaning that you should never trust Wikipedia :lol:! And certainly not me concerning grammar or spelling...

My favorite spelling is the French version: "Soyouz". It sounds more Russian to me. Don't know were I got the "s" from... perhaps from the German version "Sojus" ? So many languages can be confusing at times....

 

[N_Molson]

I've made decisive progresses on the EVA code. The problem was not EVAing, but getting the cosmonaut back inside the SA in a realistic way (not just "press E to end EVA").

So I used the Action of Area concept, that allows to make an in-game interface between the vessel and the UMmu. So when you are EVAing near the hatch, provided it is open, you press the "Enter" key (hardcoded) which activates the AoA and attaches you (again) in the stand-up EVA position. From there you switch back the focus to the Soyuz, press a key to get the cosmonaut back inside the BO, close the hatch, pressurize, and open the SA hatch, and then you re-switch focus to the UMmu and press "E" to end EVA. If you do so before the BO is safed, you get an "Airlock closed".

Not exactly the easiest part to code, still a lot of bugfixes to do in that part, but at least it can work

 

[N_Molson]

Mmh, I fear I have a memory problem, some variable going berserk again. Investigation in progress, always a long process :compbash2:

Edit : OK, I think I got it. I'm now searching for every possible case when you reload a scenario with a crewmember EVAing. It's pretty difficult to identify all the parameters to save in the .scn file. And the default case, when you don't reload anything, has to be considered too. And of course, I have to avoid conflicts between the different cases (that share the same variables).

 

[Grover]

reverse-troubleshooting? sounds like a real pain. working till late using coffee usually encourages mistakes like those that cause incredible annoyance later on.

i have plenty first time experience, like having to proof read reports 3 times to find all of the dopey mistakes (i also made 4 typos writing this para )

 

[N_Molson]

reverse-troubleshooting?

You can say so, I made the EVA (exit) code saying myself "oh, I'll see later for the reverse process". Not a good idea to make things like that ! Anyway I should have finished that part this week-end.

Next step will be focusing on the SA reentry phase, which requires some coding, definition of aerodynamics / thermodynamics data, parachutes, etc... (I'll need help there to keep with realism, I know nothing in advanced physics, so any data concerning the SA reentry is welcome !).

Just an idea :idea: : could someone make a mesh (even rough) of an all-terrain vehicle similar to this one ? Maybe with a Soviet skin. It could spawn near the capsule after landing (if close enough from the landing target) or something like that.

Concerning the Vzor, I got more info and think I can find a way to simulate it (but this is not a priority).

Oh and I read again in detail No Matter's thread on "Orbiter Francophone" forum, he was really advanced in the project, it's a shame because I'm basically aiming at the same goal with a lower skill level. :shrug:

 

[Urwumpe]

Next step will be focusing on the SA reentry phase, which requires some coding, definition of aerodynamics / thermodynamics data, parachutes, etc... (I'll need help there to keep with realism, I know nothing in advanced physics, so any data concerning the SA reentry is welcome !).

At supersonic speeds the minimum drag coefficient of the blunt capsule should be 2.5 and be around 2.6 for the usual reentry attitude. And have a constant L/D (lift to drag) of 0.4, if you keep AOA constant, until you fall below Mach 2.

 

[N_Molson]

Anyway I should have finished that part this week-end.

I've finished, and it is 23:40, perfectly on schedule :lol:

Next : SA reentry phase.

 

[N_Molson]

I managed to implement a credible reentry aerodynamic model, with a peak of 4G at 33 kilometers and an average descent rate of 150 m/s between 80 and 30 km, based on the data of Soyuz TMA-8. It still needs some refinement, but I wait to have the best lift AoA angle from Urumpwe for that.

During this time I will work on the parachutes deployement, without forgetting the retrorockets, becauses for now each test run is a reproduction of Soyuz-1 :shifty:

Also I need to code Vzor separation, mesh animations & standalone dlls for parachutes deployement (drogue & main), parachute cover separation, heatshield separation... Plenty of things to do !

 

[Urwumpe]

It still needs some refinement, but I wait to have the best lift AoA angle from Urumpwe for that.

Good that you remind me. It is cited as 20°.

 

[N_Molson]

Thanks. It really makes sense with the visuals, I was using 30° and it was obvious to me that the side of the capsule was dangerousely exposed. :yes:

 

[4throck]

Looking good. The accurate simulation (given the data, time and tools avaliable) is something I'm looking for.
I'm not a great pilot, but I do appreciate the challenge of doing things "right".

 

[N_Molson]

I got it working with an AoA of 20°. Still some minor adjustments to do, but the flight model is OK !

 

[MaverickSawyer]

Sounding and looking good, man!
:thumbup:

 

[N_Molson]

Vzor separation :



---------- Post added at 05:07 PM ---------- Previous post was at 03:50 PM ----------

Drogue chute (I think the ropes should be longer and the chute smaller (with a hole), this will require a mesh modification) :

 

[Urwumpe]

Drogue chute (I think the ropes should be longer and the chute smaller (with a hole), this will require a mesh modification) :

I think it is also further away from the capsule where it splits into the many smaller ropes. Drogue chutes are for stabilization and you need some distance between capsule and chute for that.

 

[N_Molson]

In fact, it seems that there are pilot parachutes (at least on the TMA) before the drogue chute, which role is to slow the spacecraft enough to allow main chute safe deployement.

http://www.nasa.gov/mission_pages/station/structure/elements/soyuz/landing_timeline.html

I think we often confuse both. It seems logical that the pilot chute role is to stabilize the Soyuz on a "retrograde" attitude, to ensure everything is going to deploy well. This one has certainly a long rope to maximize the drag momentum effects.

I don't really see where those smaller chutes are stored, though, and I'm not sure of the timing, the only info I have is there, and it is for the TMA :

http://suzymchale.com/ruspace/soyland.html

Parachutes are commanded to deploy. Two Pilot Parachutes are deployed, the second of which extracts the Drogue Chute. The Drogue slows the spacecraft’s descent from a rate of 230 meters per second to 80 meters per second.

The Main Parachute is then released. It slows the Soyuz to a descent rate of 7.2 meters per second. First, its harnesses allow the Soyuz to descend at an angle of 30 degrees to expel heat, then it shifts the Soyuz to a straight vertical descent.

For now I will make three parachutes deployement sequence : 1) pilot 2) drogue 3) main.

Any additional documentation / information is welcome, as always. :tiphat:

 

[diogom]

http://books.google.pt/books?id=dbG...ved=0CBkQ6AEwAA#v=onepage&q=soyuz DPO&f=false Page 68, and below :tiphat:

 

[N_Molson]

Excellent, thanks. So everything is attached in the main chute case, and tilt the spacecraft to 30° "to help heat dissipation". Only the main is attached on both sides to have a 0° landing, got it ! :thumbup:

 

[Urwumpe]

Excellent, thanks. So everything is attached in the main chute case, and tilt the spacecraft to 30° "to help heat dissipation". Only the main is attached on both sides to have a 0° landing, got it ! :thumbup:

Also remember that pilot chutes are not the same as drogue chutes. pilots are used for helping deploying larger parachutes.

The pilot chutes deploy the drogue chute (Or in translation from Russian: "drag chute") bag and the drogue chute. When the drogue is released, it pulls the main parachute bag out and deploys it.

The reserve parachute is similar, but lacks the drogue chute, it is a simpler, faster deploying and smaller parachute, but still has pilot chutes to ensure deployment even in bad situations.

Important secondary information: Both main and reserve parachute have some nice features about how to release them after landing. you can release them not, only release one parachute line (so half of the chute is still attached to the Soyuz, e.g. if you fear rolling down the hill) or completely.

 

[N_Molson]

Yes I think that the reserve chute doctrine is "maybe you'll lose 1 tooth or two, but at least you're going to make it alive"