Unexplained spin while in orbit

[iammr_schuck]

Hi guys

I'm trying to my first decent Mun landing, wherein there's a separate lander, which will return to a ship left in munar orbit then head home. This requires docking which I'm still familiarising myself with. However, I'm encountering an issue which I have trouble explaining. I've built a simple demonstrator craft which has a command pod and a lander can, both with docking ports. I get it into LKO, decouple, so that I can then spin the lander can around and try to dock it. The moment I decouple, the command pod starts spinning (no pitch or yaw it would seem, just spin) like crazy, with or without SAS on. Any suggestions?

[The_Rocketeer]

Phantom forces like this are sometimes caused by clipping parts. Are you separating a docking ring, i.e. undocking the lander, or are u using a decoupler?

[kStrout]

Sounds like the Kraken. Have you tried time warping to kill the spin?

[xub313]

Try pressing Alt+x (might be different on Linux) to reset trim. You might have accidentally set the trim on your ship to constantly roll.

[Venusgate]

i have this issue sometimes when i EVA a kerbonaut that is on contract to be rescued. I think it might be a specific bug than kraken.

[Reactordrone]

Should probably also ask the obvious question. Do both parts of the craft have control, either a pilot or a probe core, because SAS won't work without one or the other so you need either 2 pilots, 2 probe cores or a pilot and a probe core.

[cantab]

If you're using FAR, check the dang Flight Assistance isn't left on.

[Kobymaru]

Usually it's some kind of clipping. What also happend to me a lot was that I'd left my Joystick plugged in, which is slightly faulty and the control output is not centered, even if the physical stick is.