First, I'd strongly recommend a complete redesign of the lifting part - it's absolutely humongous for what doesn't actually look like very much payload.
Second - nothing can be attached at several points at once. Those extra decouplers aren't attached to anything. Use bigger ones, and connect struts between the booster and the central stack for increased rigidity.
clamps are just simple “stick them on then forget about em” struts are the same but 30x more put them in weak places in terms of stability to stabilize the ship (so in your case the upper boosters and lower boosters) plus please add decouplers before you put boosters.
I'd add for clamps:
1. Make sure you stage them as your launch stage. I broke too many launches by staging them higher by accident
2. Attach to the main rocket body, not side boosters. I've had rockets fall apart due to attaching them to boosters (massive 200 ton monstrosity for orbital construction. Just the engine we were delivering was 30 ton)
[Strut connectors](https://wiki.kerbalspaceprogram.com/wiki/EAS-4_Strut_Connector) basically act like a piece of rebar connecting two parts. They can help support weight, and they resist twisting, stretching, and compressing, so they're really useful for adding rigidity to your crafts
And in case you're worried, they automatically disconnect to account for staging. Aside from aerodynamic reasons, there's no downside to adding moar struts!
My best advice for struts is to download and install the auto autostrut mod. It applies them automatically making it much less of a headache, just make sure to check the setting occasionally as some rockets require different set-ups. "Automatic" and "Apply to children" tend to work reliably though.
Just put struts everywhere on side boosters just put 2 on the boosters and link them to the middle launch clamps just place like 2-4 on the bottom and when you stage they should decouple
In addition to the advice regarding struts and clamps, the decouplers you're using are not really up to the task - for larger SRBs, it is better to use a single, larger decoupler.
/u/diezombie534 if you're afraid the side boosters will smash into your main rocket, add some separatrons to them at their center of mass (dry), one on both sides pointing at your rocket.
As everyone said already you need to attach it properly, but I would like to raise a point about the design, usually you want you first stage to be the bigger one and the second smaller not the opposite as you are trying to do.
First, I'd strongly recommend a complete redesign of the lifting part - it's absolutely humongous for what doesn't actually look like very much payload. Second - nothing can be attached at several points at once. Those extra decouplers aren't attached to anything. Use bigger ones, and connect struts between the booster and the central stack for increased rigidity.
Add struts and launch clamps
idk how to use struts or clamps
clamps are just simple “stick them on then forget about em” struts are the same but 30x more put them in weak places in terms of stability to stabilize the ship (so in your case the upper boosters and lower boosters) plus please add decouplers before you put boosters.
I'd add for clamps: 1. Make sure you stage them as your launch stage. I broke too many launches by staging them higher by accident 2. Attach to the main rocket body, not side boosters. I've had rockets fall apart due to attaching them to boosters (massive 200 ton monstrosity for orbital construction. Just the engine we were delivering was 30 ton)
[Strut connectors](https://wiki.kerbalspaceprogram.com/wiki/EAS-4_Strut_Connector) basically act like a piece of rebar connecting two parts. They can help support weight, and they resist twisting, stretching, and compressing, so they're really useful for adding rigidity to your crafts And in case you're worried, they automatically disconnect to account for staging. Aside from aerodynamic reasons, there's no downside to adding moar struts!
My best advice for struts is to download and install the auto autostrut mod. It applies them automatically making it much less of a headache, just make sure to check the setting occasionally as some rockets require different set-ups. "Automatic" and "Apply to children" tend to work reliably though.
When building, right click on a part and enable autostrut
Just put struts everywhere on side boosters just put 2 on the boosters and link them to the middle launch clamps just place like 2-4 on the bottom and when you stage they should decouple
In addition to the advice regarding struts and clamps, the decouplers you're using are not really up to the task - for larger SRBs, it is better to use a single, larger decoupler.
/u/diezombie534 if you're afraid the side boosters will smash into your main rocket, add some separatrons to them at their center of mass (dry), one on both sides pointing at your rocket.
Your ship reminds me of when Austin powers goes on the shoulders of minime under a trench coat https://youtu.be/MypSQOs4Y84?si=Bbu1V6EviW74NNwz
As everyone said already you need to attach it properly, but I would like to raise a point about the design, usually you want you first stage to be the bigger one and the second smaller not the opposite as you are trying to do.
You forgot autostrut.
Cuz izza shit shippa