One stack decoupler keeps failing on my rocket, any ideas how to fix it?

[JeffOfJeffs]

I have tried adding a ridiculous amount of struts, panels going around, crazy make-shift bracing, and still almost every time at about 3000-4000 up it fails and then the rest of my rocket explodes. Any ideas on how to fix it?

http://imgur.com/tc5Fqba

http://www./view/q1bibztgbtl5hwi/Prince_Bismarck_V2.craft

[MoonMan22]

Could be you are exceeding your terminal velocity. Try throttling down until you reach the thinner part of the atmosphere.

Check on this page, under "Atmosphere" : http://wiki.kerbalspaceprogram.com/wiki/Kerbin

Edited February 26, 2014 by MoonMan22

[DocMoriarty]

I think the problem is that the physics seem to work pretty weird at times. The upper part of the rocket seems to hold the lower part, not the lower part supporting the upper which causes a lot of problems and headaches. Not the number of struts is important, but from where to where they go to avoid problems with this.

The first big problem i see is that your inner ring of asparagus rockets is connected to the payload module. Now the payload module has to carry the whole weight of the ring and anything between the center rocket and payload is compressed and squeezed together.

I usually strap my struts on like this:

The lower tanks basically focus all their weight in the topmost center tank of the launch rocket. And only from this very same tank there are struts going up to the payload. There are no struts going from the side tanks directly high up.

[capi3101]

...yeah, I agree with MoonMan22: you've probably got a little too much thrust there for your payload. I recommend you read through [http://forum.kerbalspaceprogram.com/showthread.php/28248-Is-asparagus-the-best-staging-system-%28might-contain-science%29?p=346702&viewfull=1#post346702]Temstar's Guidelines for good asparagus. And if you don't want to redesign your booster, at least throttle back so that the gee meter stays in the green zone (especially when you're still in the soup below 10k).

[Kasuha]

You used a lot of struts, but majority of them ends below that decoupler. That's the problem. Put them all the way to the payload above the decoupler.