Rover spinning out of control

[Slickit]

Hello everybody,

I was hoping y'all could help me with a little issue I have with a lander/rover I built, a very strange issue that I have never come across. I made a lander/rover to go to the mun to be a fuel tanker for kethane mining. I got the rig into a 100km orbit and began my transfer burn to the mun when I ran out of fuel in the ascent stage portion of the rocket as I expected when I separated to use my atomic engine and it would not burn, it showed as if it had no fuel but I was certain I had made it with all cross-feed capable parts. So I said "no bother" "I'll just use the rockets on the lander, 90* out, it will add a challenge" but after I separated from the atomic engine the rover began to spin uncontrollably. So I thought perhaps it was only due to the separation so I countered the rotation and watched it slow, but once I released control it began spinning faster. Then I figured the wheels on the rover were perhaps moving and causing some inertial spin so I carefully clicked each wheel and disabling the motor on them. Even still after this and disabling the reaction wheels on the command modules it was all to no avail, even the RCS couldn't completely stop the spinning. So how could I fix this.... You will see that I have attached the craft file and save file along with a rar with the mods I have installed. Any assistance would be greatly appreciated. There is one battery part in there that isnt from a mod or part pack its one I edited. Its the 4k battery, I made it an 8k. sorry about the audio.

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Link for game files - https://dl.dropboxusercontent.com/u/23147727/slickit%20kerbal%20stuff.zip

Edited September 13, 2013 by Slickit

[capi3101]

SAS on would've helped reduce the spin - reactivate the reaction wheels in the probe core and hit T.

Also, is it still spinning when you exit the game and reload?

[Slickit]

I used the SAS to begin with and without RCS and it wasnt enough force to stop it unfortunately. I tried enabling the reaction wheels after I disabled the wheel motors and still no change. When I loaded the game the next time it was all gone and I didnt remember recovering it or anything so..... But it is possible I reverted the flight and didnt remember.

[Specialist290]

Have you taken a look at the design itself in the VAB / SPH? I've heard reports that sometimes if you have parts clipped through one another, they can create phantom forces acting on your craft due to the way the game engine handles the physics calculations. I don't know if it still happens in later versions of the game, but the issue used to pop up infrequently at least a few months back.

[Slickit]

i believe you may be correct. I just adjusted a few things on my design and re-launched it to test to see the spinning and sure enough it happened again. I made an action group to disable all motors and the extra control module for the little rover that sits in the back to troubleshoot more easily and even though I disabled all that it happened again and I couldn't control it. I decoupled the small rover off the back and the main rover stopped and the little one began spinning like a top. So I have at least narrowed down the problem to a very small and easily rebuild-able rover. I will remove it and test it with hack gravity to see if it produces those forces on its own but its good to know that I don't have to make the big rover over again.

[Slickit]

anyone know how i can change the thread title to answered instead of unanswered??

[Specialist290]

Edit your first post. You should be able to select "Answered" in the drop-down menu.

[Slickit]

Found the problem, I pulled the little rover off and tested it with out gravity on kerbal and it did not spin out so finding that i figured that it was one of the parts i took off to test it that wasn't off during the last test, and that was a separator glitching with the wheels causing the tires to jump ever so slightly. Changed out the separator and moved the wheels and put it all back together and now its better than before. Thanks for all the help.