My rocket keeps tipping

[pokemonareugly]

MK1 parachute

1 MK1 command pod 2 radial parachutes1 comms array 1

Science lab JR 2 mYstery goo 4 battery boxes

13x FLT-400

1 stack decoupler

1 stack triocupler

3x S1 SRB KD25k

[juanml82]

You should post a screenshot of the rocket. It may not be symmetrical, even slightly, the top of the rocket might be bending during the ascend causing the CoM to shift or something else.

[Pecan]

MK1 parachute

1 MK1 command pod 2 radial parachutes1 comms array 1

Science lab JR 2 mYstery goo 4 battery boxes

13x FLT-400

1 stack decoupler

1 stack triocupler

3x S1 SRB KD25k

I'm not surprised it tips, did you have a question? *grin*

Mostly; 13x FLT-400 - Really? That's hugely long and thin. What are they fuelling, you don't list an engine.

[Volcanix]

I'm sure it starts tipping after it starts wobbling around. First of all, try to strengthen some connections between the upper stage and the tricoupler. It would be great if you could post a screenshot on a page like Imgur or elsewhere so people can have a look at your design

[SRV Ron]

There are a number of threads already on this subject. Causes range from imbalance, to aerodynamics at certain speeds, to broken struts causing twisting of add on boosters.

[Tex_NL]

There are a number of threads already on this subject. Causes range from imbalance, to aerodynamics at certain speeds, to broken struts causing twisting of add on boosters.

In this case I guess it's a total lack of control.

His rocket has no control surfaces and the S1 SRB KD25k's have no thrust vectoring. The torque from a single MK1 command pod is not nearly enough to keep a tall thing rocket like that on course.

[Volcanix]

In this case I guess it's a total lack of control.

His rocket has no control surfaces and the S1 SRB KD25k's have no thrust vectoring. The torque from a single MK1 command pod is not nearly enough to keep a tall thing rocket like that on course.

Oh yeah good that you mentioned it, maybe an SAS module would help. The command pod has nearly nothing on SAS force in relation to that giant rocket.

@pokemonareugly (nice name btw ) Try adding some SAS modules from the control section in the VAB. I don't know if there is a special place for them where they are more effective, but I usually place them under my command pod. If that's not enough, maybe attach some right over the boosters or one over the tricoupler. And please post screenshots

[NecroBones]

Why does the rocket have 13 liquid fuel tanks, and no liquid engine (unless it's just missing from the list)? The SRBs don't need all those fuel tanks.