SSU V1.25 Release

[Urwumpe]

Yes, but I was talking about the default Atlantis SRBs, not the new SSU SRBs.

And I was talking about the old SSU SRB code... with old being almost one year without changes.

 

[DaveS]

Looking at the video that GLS posted, it seems like the forward BSMs burn a bit longer than the aft BSMs. Maybe this would fix the sep behaviour of the SRBs? Make the forward BSMs have 2-3 second longer burn time than the aft ones.

Makes sense from a physical standpoint too, that's the forward BSMs that induce the tumbling rotation of the SRBs post-sep.

 

[Urwumpe]

Makes sense from a physical standpoint too, that's the forward BSMs that induce the tumbling rotation of the SRBs post-sep.

As far as the specifications and the video goes, they all burn equally long for about one second. You have to remember they are solid motors, which don't stop abrupt.

But I noticed that one of the aft BSMs is not parallel to the other three. Also, I am not sure we have the correct CoG position of the SRB or if the aerodynamics of them are really like that.

 

[DaveS]

But I noticed that one of the aft BSMs is not parallel to the other three. Also, I am not sure we have the correct CoG position of the SRB or if the aerodynamics of them are really like that.

Position: -1.194, 2.896, -19.328
Dir: -0.102, 0.339, -0.9347


-----Post Added-----


Just added the aft off-angle BSM and it sure does impart rotation to the SRB! Just need to correct the dir as it's currently firing upwards instead of outward.

 

[Donamy]

Hows the wabble during roll coming ?

Here's a tease!

 

[Urwumpe]

Just added the aft off-angle BSM and it sure does impart rotation to the SRB! Just need to correct the dir as it's currently firing upwards instead of outward.

Did you also correct the BSM thrust for it being 3+1 at the aft end now? If that thruster was the missing key, then I just need to find out why we use more total impulse than we own.

 

[DaveS]

Did you also correct the BSM thrust for it being 3+1 at the aft end now? If that thruster was the missing key, then I just need to find out why we use more total impulse than we own.

Thrust: yes.
Seems to be the missing key. Going to try the revised directions now.


-----Post Added-----


For some reason I can't get the dir to be outward firing. Even with this revised dir it still fire upwards: -0.132,-0.935,-0.326

 

[Urwumpe]

For some reason I can't get the dir to be outward firing. Even with this revised dir it still fire upwards: -0.132,-0.935,-0.326

Of course. Look at the Y component. -0.935 is too much, if you want it to fire rather backwards and out, you need 0.935 at the Z component.

 

[DaveS]

Could you maybe take a shot at this? I'm not getting anywhere with it.

 

[Donamy]

Checked in the S6 mesh and textures with a spacecraft3.ini So we can have a new payload for the SSU.

 

[Urwumpe]

Could you maybe take a shot at this? I'm not getting anywhere with it.

No more today, I can't see C++ anymore after coding the whole day.

 

[SiameseCat]

Hows the wabble during roll coming ?

I'm still working on the RMS IK bugs, and haven't had a chance to update the gimballing code.

I'm in the process of shifting the RMS code over to the RMSSystem class; at the moment, two copies of the RMS mesh will be displayed. This should be fixed in a day or so.

 

[Donamy]

A test

http://www.motionbox.com/video/player/0a99d8b21c19e2c087

 

[Urwumpe]

A test

http://www.motionbox.com/video/player/0a99d8b21c19e2c087

Does not work, it asks for the flash player, though the latest version is installed here.

 

[Notebook]

It works for me, runs 1:15 and shows two solar panel animations?

N.

 

[DaveS]

It works for me, runs 1:15 and shows two solar panel animations?

N.

That it is indeed, That's Donamy's new S6 truss with its two Solar Array Wings and Photvoltaic Radiator being deployed.

 

[Urwumpe]

I just added a new thrust profile for the SRBs, this time we should not run out of fuel that early. Found out that we used 24 Meganewtonseconds of impulse (out of 13.25 GNs) more, than we had, after going over the numbers with more care. We should now have 24 kNs more impulse inside the fuel than really needed by us, but otherwise, I would have needed much longer numbers...

The thrust function is also more smooth now, made the numbers appraoch exponential slopes, like the SRBs should have, behind the noise.

 

[DaveS]

Trying to compile the latest sources but getting these errors from RMSSystem.cpp:
error C3861: 'RotateVectorX': identifier not found
1>.\RMSSystem.cpp(191) : error C3861: 'RotateVectorZ': identifier not found
1>.\RMSSystem.cpp(192) : error C3861: 'RotateVectorY': identifier not found
1>.\RMSSystem.cpp(247) : error C3861: 'RotateVectorZ': identifier not found

 

[Urwumpe]

Trying to compile the latest sources but getting these errors from RMSSystem.cpp:
error C3861: 'RotateVectorX': identifier not found
1>.RMSSystem.cpp(191) : error C3861: 'RotateVectorZ': identifier not found
1>.RMSSystem.cpp(192) : error C3861: 'RotateVectorY': identifier not found
1>.RMSSystem.cpp(247) : error C3861: 'RotateVectorZ': identifier not found

Confirmed. I also don't have yet the changes of you on the BSM positions I think.

 

[DaveS]

I also don't have yet the changes of you on the BSM positions I think.

Checked in.