Rocket always bending down/bouncing

[KrizzGaming]

I just built my first rocket and added a lot of struts.

But unfortunately the final stage keeps on bouncing up and down.

Any suggestions? Mods are also helpful too!

Edited February 18, 2015 by KrizzGaming

[Sirrobert]

What exactly do you mean with bouncing?

Like a harmonica when thrusting? That usually means you have a relatively weak connection and a gigantic amount of thrust (more than the rocket needs/is optimal)

For any concrete advise, we'd need a screenshot though

[B787_300]

Krizz also look into to getting Kerbal Joint Reinforcement (http://forum.kerbalspaceprogram.com/threads/55657-0-23-Kerbal-Joint-Reinforcement-v1-7-1-18-14-v2-0x2-experimental-available%21)

[Norpo]

Mods are also helpful too!

Kerbal Joint Reinforcement is designed to specifically remove this problem. Your rockets will fly like rockets, and less like wet noodles.

http://forum.kerbalspaceprogram.com/threads/55657-0-90-Kerbal-Joint-Reinforcement-v3-1-1-1-15-15

EDIT: Annnd B787 gave the exact same response.

[B787_300]

Norpo Moderator Ninja Skills...

also as SirRobert said, struts and try toning down the thrust some

[Taki117]

If, however, it is not actually a "Bending" problem, but rather a "My rocket is pitching downwards whenever I do my gravity turn" problem you need more control authority, either in the form of reaction wheels or winglets/fins. Reaction wheels can go anywhere on your rocket (Though I suggest at the top so that they stay with you for a while) while winglets/fins go near the bottom to improve stability.

[KrizzGaming]

If, however, it is not actually a "Bending" problem, but rather a "My rocket is pitching downwards whenever I do my gravity turn" problem you need more control authority, either in the form of reaction wheels or winglets/fins. Reaction wheels can go anywhere on your rocket (Though I suggest at the top so that they stay with you for a while) while winglets/fins go near the bottom to improve stability.

It also bends down when I set the time warp to 3 or 4.

- - - Updated - - -

Krizz also look into to getting Kerbal Joint Reinforcement (http://forum.kerbalspaceprogram.com/threads/55657-0-23-Kerbal-Joint-Reinforcement-v1-7-1-18-14-v2-0x2-experimental-available%21)

Thanks just downloading it right now!

[Norpo]

It also bends down when I set the time warp to 3 or 4.

Yeah, that happens because physics calculations aren't easy, so when you time warp; it has to do more of them, and at lower quality.

In extreme cases, time-warping can result in rockets breaking entirely, even without rocket thrust.

[zekes]

Struts, struts, and more struts. I got 1337 tonnes to stand straight up perfectly like a pole by strutting every single vertical tank with the one below it.

[Starwhip]

Yeah, struts fix it. Though so does KJR, if that's your kettle of fish.

With the new gizmos and strut logic it's easy to make nearly-concealed struts... Just sink the strut or the part it's attached to into something else.

[Sirrobert]

It also bends down when I set the time warp to 3 or 4.

Nothing's going to fix that. High phsycis warp skips calculations to speed things up, and in doing so it massively amplifies any applied force. Never go higher than 2x physics warp while burning engines, it's basicly begging for your stuf to break.

You should actually get a warning if you go above 2x that it makes things unstable. That warning is not kidding. (note that on rails time warping (5x and higher, only avaiable without thrust and in space) is perfectly safe)

[Starwhip]

Nothing's going to fix that.

Except struts. Enough and you've got something that will not flex at all.

Though you do have to use them smartly... triangles are your friends!