Bug #13202
SAS ROLL not damping properly
100%
Description
Most of my ships are experiencing a lack of damping and overshooting the centre mark. Most noticeable on ROLL.
A ship will roll slightly back and fourth never settling down.
Sometimes use of the roll keys Q and E will settle it down for a few seconds but it starts again on it's own.
Particularly noticeable on ships with side tanks (not clipping)
Setting aside the fact that KSP gives No orientation information when docking, this makes it very difficult to dock precisely when building stations and Interplanetary ships in orbit.
I am playing in Stock KSP but I think that even the use of a mod such as Docking Port Alignment Indicator will not be as useful because of this problem.
Linux 64 Stock KSP 1.2.1
Related issues
History
#1
Updated by sal_vager almost 8 years ago
Updated by - Status changed from New to Duplicate
- % Done changed from 0 to 100
Hi Daveroski, this has already been reported and is known to the developers, please see issue #13099
#2
Updated by sal_vager almost 8 years ago
- Related to Feedback #13099: SAS Hold Extremely Difficult With Wheel Authority Set To 1% added
#3
Updated by Daveroski almost 8 years ago
Updated by This is NOT a duplicate of that issue.
That issue refers to control authority.
This issue refers to SAS in general.
A command pod mounted to a liquid fuel tank with four symmetrical side liquid fuel tanks and a NIRV is a great example.
Anyone who has actually spent a little time playing the game would see that this roll exists and it IS a bug.
It has even happened using some of the most simple ships creatable. One pod one tank one engine.
No other other SAS control but the pod the rocking motion happens.
Add a 1.5 SAS behind the pod. It STILL happens.
If this isn't going to be fixed, it's a game breaker for me. I like to build structures in space by docking parts together. This rocking motion often makes it impossible to align the sections.
I described it clearly in my OP. How did you arrive at the conclusion that it had ANYTHING to do with control authority settings?
#4
Updated by sal_vager almost 8 years ago
- Related to deleted (Feedback #13099: SAS Hold Extremely Difficult With Wheel Authority Set To 1%)
#5
Updated by sal_vager almost 8 years ago
- Related to Bug #3950: SAS directional hold overshoots significantly added
#6
Updated by sal_vager almost 8 years ago
You're half right, both issues are duplicates of #3950, SAS will struggle if it doesn't have enough authority and this is true regardless of the authority limiter, that just makes the issue more visible.
Fixing this would require a whole new SAS though, it's just a flight aid, it's not there to fly for you, but Squad are not ruling out replacing the SAS with a better system in the future as it is a desirable feature amongst players.
SAS is working as well as it can do for the moment, on your example craft you have only the pod reaction wheels to provide control, the LV-N has no gimbal so the SAS authority is limited.
Thank you for your report.
#7
Updated by psycho_zs over 7 years ago
Updated by I also do not believe this bug is a duplicate.
I usually build ships with equal authority over every axis. SAS holds pitch and yaw rock solid, but not roll. Roll is not only undampened, but oscillations are sometimes self-inducing.
I already reported this here http://bugs.kerbalspaceprogram.com/issues/12815, but now it gives 403.
#8
Updated by psycho_zs over 7 years ago
What about weird precision RCS logic described in #12815? It is still present in latest pre-release.
It was introduced in 1.1 or 1.2. (I don't remember precisely, but before that RCS thrust was balanced and scaled correctly).
#9
Updated by ancassid over 6 years ago
Updated by I'm having this issue too with 1.3.1. it seems to be most common when using radial docking ports like the shielded inline clamp-o-tron