Throttle instability Problems

[libentho000]

I've been having this problem where I launch a rocket and I lose control of the throttle. The throttle starts going up and down repeatedly, the engines start gimbaling rapidly, and it slowly heads upward at about 14 m/s. I fix this by detaching my payload, however, this only works if the rocket has already taken off, if I detach the payload and then launch the rocket, the same error occurs. This doesn't happen with KSP stock rockets, it primarily happens with the SpaceX addon rockets. Though the rockets didn't do this when I originally added them weeks prior. I've tried isolating the variables, but it has led me nowhere. 

[edwin.robert]

11 hours ago, libentho000 said:

I've been having this problem where I launch a rocket and I lose control of the throttle. The throttle starts going up and down repeatedly, the engines start gimbaling rapidly, and it slowly heads upward at about 14 m/s. I fix this by detaching my payload, however, this only works if the rocket has already taken off, if I detach the payload and then launch the rocket, the same error occurs. This doesn't happen with KSP stock rockets, it primarily happens with the SpaceX addon rockets. Though the rockets didn't do this when I originally added them weeks prior. I've tried isolating the variables, but it has led me nowhere. 

Which SpaceX mod is it? Launchers pack? Tundra exploration? Laztek? Also make sure you don't have mechjeb turned on or anything. 

[libentho000]

Mechjeb wasn't on when i was trying to fix the problem.

[FleshJeb]

5 hours ago, libentho000 said:

Mechjeb wasn't on when i was trying to fix the problem.

Check the settings on the Utilities panel--That might be the MaxQ protection or G-limiter kicking in. If you have Mechjeb installed on the craft, it's never NOT on.

[libentho000]

oh, ok I'll try.

[libentho000]

I removed the mechjeb unit, and it worked fine, though it wobbled a lot.

I don't use the utilities window for anything so what should I be looking for.

 

It says limit q to 100 pa.

 

I re-added mechjeb, and turned the q limiter off, and it worked well enough to get into orbit.

Edited May 29, 2019 by libentho000
more info

[FleshJeb]

On 5/28/2019 at 5:23 PM, libentho000 said:

I removed the mechjeb unit, and it worked fine, though it wobbled a lot.

I don't use the utilities window for anything so what should I be looking for.

 

It says limit q to 100 pa.

 

I re-added mechjeb, and turned the q limiter off, and it worked well enough to get into orbit.

Oops, sorry I didn't see this until now. You have to quote or @FleshJeb someone for them to notice a response.

I just checked, the default value for that is 20000, but it's not really important unless your rocket is extremely overpowered, or has very bad aerodynamics.

I'm glad it worked--Have fun!