I need to know how to stop my spacecraft from wobbling

[DistressedKerbonaut]

Hey there! Im playing on ps4 and im trying to assemble my Space craft using a single high isp rocket with a lander attached Apollo-style. Thing is, everytime i tried it in the past, i remember the whole craft started wobbling in every direction and i'd like to avoid that as much as possible. Can anyone help me plz ?

Edited October 16, 2022 by DistressedKerbonaut

[Vanamonde]

What does the craft look like? This is usually a design problem. 

[Rutabaga22]

Sound's like a kraken attack. You might need to use autostrut or take away parts.

[DistressedKerbonaut]

Sorry i cant figure out how to post the picture but basicaly, its a big spacecraft made out of a Mk1-3 command pod followed by 3 Rockomax x200-32 fuel tank below. I attached 3 other smaller fuel tank on 3 sides and put nuclear engine on each. The lander goes on top, docked in space with clampotron. I made it with 1 rckmx x200-32 and 1 rckmx x200-8, a 2.5m payload and a poodle engine. With all the science gathering stuff i have rn, solar panel and batteries

[DistressedKerbonaut]

39 minutes ago, Rutabaga22 said:

Sound's like a kraken attack. You might need to use autostrut or take away parts.

I'll try the autostrut, im still a noob so i have a hard time getting the right amount of dv so i wouldnt know what part to take off, thanks!

Edited October 16, 2022 by DistressedKerbonaut

[magnemoe]

Are you using mechjeb? It tend to overcompensate, so turning off or restricting gimbal on engine might help as on an long rocket both the reaction controls in front and the gimbal at the rear can start fighting each other. If you have two reaction wheels turning one off also help. 

[DistressedKerbonaut]

2 hours ago, magnemoe said:

Are you using mechjeb? It tend to overcompensate, so turning off or restricting gimbal on engine might help as on an long rocket both the reaction controls in front and the gimbal at the rear can start fighting each other. If you have two reaction wheels turning one off also help. 

I do have a reaction wheel but its pretty close to the main engines and it is turned off, should i turn off the lander pod reaction wheel  and its engine gimbal also?

[Leganeski]

5 minutes ago, DistressedKerbonaut said:

I do have a reaction wheel but its pretty close to the main engines and it is turned off, should i turn off the lander pod reaction wheel  and its engine gimbal also?

I have found that just turning the engine gimbals way down (to about 20-30%) fixes wobbling in a lot of cases, especially with long rockets.

[DistressedKerbonaut]

I captured kerbin on the wrong side but other then that, it was a total success! Thank you all for the tips, everything went so smoothly it almost made it easy ( tho it took me quite a while to accomplish) . Thanks again !! \○/

[Superfluous J]

On 10/15/2022 at 11:09 PM, DistressedKerbonaut said:

Sorry i cant figure out how to post the picture

Save it locally, then upload it to an image service. I use imgur because it's free and easy. Then once uploaded right click and copy the image LINK and paste that link here. If you do it correctly it'll be a "jpg" link and once pasted, will just show up in your post.

 

[DistressedKerbonaut]

1 hour ago, Superfluous J said:

Save it locally, then upload it to an image service. I use imgur because it's free and easy. Then once uploaded right click and copy the image LINK and paste that link here. If you do it correctly it'll be a "jpg" link and once pasted, will just show up in your post.

 

Thanks! 

[Joker58th]

On 10/17/2022 at 1:07 AM, Superfluous J said:

Save it locally, then upload it to an image service. I use imgur because it's free and easy. Then once uploaded right click and copy the image LINK and paste that link here. If you do it correctly it'll be a "jpg" link and once pasted, will just show up in your post.

 

Since he's on a PS4 it might take a little more doing.  One way might be to take a screen shot and then plug a usb flash drive into your ps4 and go to settings and see if you can move move it to the flash drive.  Then you can follow Superfluous's instructions on your computer.

[DistressedKerbonaut]

On 10/19/2022 at 3:39 PM, Joker58th said:

Since he's on a PS4 it might take a little more doing.  One way might be to take a screen shot and then plug a usb flash drive into your ps4 and go to settings and see if you can move move it to the flash drive.  Then you can follow Superfluous's instructions on your computer.

I simply took a picture of the screen with my phone since i dont have a computer yet but thanks!

[FleshJeb]

On 10/16/2022 at 7:46 AM, magnemoe said:

Are you using mechjeb? It tend to overcompensate, so turning off or restricting gimbal on engine might help as on an long rocket both the reaction controls in front and the gimbal at the rear can start fighting each other. If you have two reaction wheels turning one off also help. 

This is good advice both for both MJ and stock.

For MJ, I also found going into the PID-tuner and quadrupling the default Kd term helped quite a bit. It's been a few years since I played, but I think the default was 0.5 and I set mine to 2.0.