Space Shuttle Ultra development thread

[ryan]

Wow, any idea guys when it will be out.

 

[DaveS]

Wow, any idea guys when it will be out.

No! Stop asking this! We won't know until the day before and plus, you can get it right now by simply checking out the sources from the SVN repository and building them. It isn't that hard.

 

[ovruc]

Aft Station

Weeeeeeee!


Now that looks like a aft station.

Impressive, very impressive!!!!

 

[DaveS]

I was just wondering: Are we going to use the default KSC tiles or Kukanotas' higher res KSC tiles? I just wonder as it affects the placement of the pad elements.

 

[Urwumpe]

I think we go by the default tiles and allow using patched scenarios for the hi-res tiles.

Also I think we should define the context "STSULTRA" for all bases we use.

 

[DaveS]

I think we go by the default tiles and allow using patched scenarios for the hi-res tiles.

Also I think we should define the context "STSULTRA" for all bases we use.

OK.

 

[DaveS]

Some recent screenshots of the concrete hardstand. Almost completed now.

 

[DaveS]

I know I have asked this before, but how about adding the SSME prechill LOX venting? If not as an automated vehicle function, then how about as a opitional scenario parameter(LOX_VENT <0 or 1>)? As I have written before, I can supply the PSTREAM parameters.

 

[Urwumpe]

if you can get the parameters, it should be no problem.i recommend creating thrusters for that, so we can keep on venting while making the gimbal checks.

and can somebody get me some information about the A2 panel? i have so far only found out that it is related to the Ku band antenna, but i can't tell its exact behavior.

 

[DaveS]

Well, here you go:

SRCSIZE=0.06
SRCRATE=140
V0=10
SRCSPREAD=0
LIFETIME=1.25
GROWTHRATE=1.1
ATMSLOWDOWN=1.25
LTYPE=EMISSIVE
LEVELMAP=LVL_SQRT
LMIN=0
LMAX=1
ATMSMAP=ATM_PLOG
AMIN=1e-1140
AMAX=1
TEX=Contrail1

Make sure that the streams are angled just like the SSME nozzles.

 

[Urwumpe]

Which thruster location do I use?

 

[DaveS]

Which thruster location do I use?

Let me research that. Should have some prelim numbers in an hour or two.

 

[Urwumpe]

Ok, I then just prepare the code. Shall I make the preliminary key bindings like the Shuttle Fleet?

From my last commit message:

Removed many warnings. Please take warnings serious and fix them. Warnings are not the end of the compilation process, but may result in runtime errors and CTDs.

Please, think about it and stop ignoring warnings. I know we have many of them sometimes, and their sense is sometimes hard to see, but a compiler can't read your mind and know, what you are up to. I just spent some evenings only kicking out all warnings, which we could have avoided earlier.

For example the warning when converting from double to int can be avoided by just including an explicit cast to int, which tells the compiler that you really want to ignore the fractional part of the floating point number this time.

But in many other situations, the same warning will tell you, that you use the wrong variable type for your calculations.

 

[DaveS]

Ok, I then just prepare the code. Shall I make the preliminary key bindings like the Shuttle Fleet?

Yes. Make it X (GOX or LOX).

 

[Urwumpe]

OK, CTRL + X for not colliding with Orbiter.

I also disable it automatically on main engine start, that should avoid some troubles.

I also added three extra thrusters for the MPS LOX dump. Nothing is know about how it looks like in reality, but I would say dumping almost one ton of LOX should be visible.

 

[DaveS]

I also disable it automatically on main engine start, that should avoid some troubles.

Good! And that is how it should be. A fraction of a second before main engine start at T-6.6 seconds the MPS valves for the LOX venting is closed and the stream disappears rather fast(less than a second).

I also added three extra thrusters for the MPS LOX dump. Nothing is know about how it looks like in reality, but I would say dumping almost one ton of LOX should be visible.

Oh yeah! On really windy days the smoke can almost obscure the views of the main engines from cameras 70 and 71.

And here's the positions:
Center engine(Engine 1): -1.149 3.166 -13.91
Left engine(Engine 2): 1.754 1.274 -14.471
Right engine(Engine 3): -2.615 0.239 -14.665

 

[Urwumpe]

Uhm... I mean the Post-MECO MPS dump, when the LOX trapped inside the lines of the aft compartment is dumped. We are talking about 4000 lbs mass which gets dumped and vented in the phase.

 

[DaveS]

Here's a few old screenshots of the venting in action:

 

[Urwumpe]

I think we need a stronger source velocity spread factor than 0 - it looks a bit too solid that way. A higher value (maybe 0.05) might create a more diffuse cloud.

 

[DaveS]

I think we need a stronger source velocity spread factor than 0 - it looks a bit too solid that way. A higher value (maybe 0.05) might create a more diffuse cloud.

Well, I went with what looked best compared to STS-114(tanking) and STS-107(launch), both had almost no wind at the pad.