search

shadowmage45 / SSTULabs

Dev repository for testing/unfinished KSP parts/plugins/etc.
Other
62 stars 41 forks source link

Radial booster decoupler + srb slams into main core #683

Open Jimbodiah opened 6 years ago

Jimbodiah commented 6 years ago

I can not get SRBs to seperate properly with the radial decouplers anymore. The nse of the SRB slams into the main core very agressivly for some reason, even with the force/thrust set to max for the top engines. I have not seen it in prior releases. Liquid fuel boosters don't have this tendency as badly, but it is still there although I can get them to go away from the main core far enough so not to destroy them, but the boosters do slam into each other not far behind the main core and destroy themselves.

Not sure if logs will help, but let me know and I will pack them up.

NB: I don't use FAR or other mods, and this behavior is in a stock kerbin system (no rescales).

Jimbodiah commented 6 years ago

I think it is primarily smaller diameters; 1.25-1.875m that are sensitive to this.

shadowmage45 commented 6 years ago

Interesting; I certainly haven't changed anything in the models or plugin recently. But neither have I really tried using those parts in quite awhile, so there may well be a problem somewhere.

Logs likely aren't going to say much at this point, but some screenshots of the craft setup in question would be helpful. If it is stock+SSTU parts, a .craft file would be good too (or if you can come up with a simple stock/sstu craft that exhibits the problem).

If it really does only pop up on smaller scales it might be related to improper drag cube calculations/updating, or it could even be related to model origin/COM setup oddities.

Jimbodiah commented 6 years ago

I've watched tons of launches and it seems to be the SRB that is the issue, not the RBDC as I don't have the issue with small liquid fuel boosters.

Even with 2.5m version the booster seperate, then go away from the main core, but if you keep looking at the boosters as they trail behind, you see them going back to the center and they always hit each other. It's just that with small boosters this movement after seperation is much faster, meaning they slam into the main core; bigger boosters move inward again but that is well behind the main core.

shadowmage45 commented 6 years ago

Do you have the same problem when using stock decouplers with the same SRBs? (e.g. is it simply an aero/drag/COM/COP issue) Do you have the same problems when using the RBDC with equivalent sized stock SRBs?

(trying to figure out if it is module, model, or config related)

CindyRIng commented 4 years ago

I recreated this problem in version 1.9, and when I separated, it collided with the center