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[Fikes]

Anyone else have the problem where turning on RCS and ASAS causes your ship to wobble away every last drop of your mono-propellent? I swear, ships that were 100% stable in 18.1 suddenly dance back and forth across the intended heading in 18.2.

It is frustrating to watch. I have ASAS on, then I turn on RCS, and it yaws right just slightly, the it yaws left to correct, the yaws right harder to correct. After a few seconds it is full yaw right, full yaw left, over and over.

Makes docking almost impossible.

Am I just putting on too many RCS ports?

[LoSboccacc]

about fuel usage: all .1 ship have wrong fuel value in their rcs tanks.

about wobblines: rcs in .2 now use full force to turn your ship around, so it is possible that a .1 ship is now overcontrolled.

[Fikes]

about fuel usage: all .1 ship have wrong fuel value in their rcs tanks.

about wobblines: rcs in .2 now use full force to turn your ship around, so it is possible that a .1 ship is now overcontrolled.

I thought about this so I build a new design in 18.2 and had the same problem.

I am considering a complete fresh install next with a simple ship to orbit just to see how rcs + asas react, but I was hoping for a simple solution.

[Graknorke]

about fuel usage: all .1 ship have wrong fuel value in their rcs tanks.

about wobblines: rcs in .2 now use full force to turn your ship around, so it is possible that a .1 ship is now overcontrolled.

I thought about this so I build a new design in 18.2 and had the same problem.

I am considering a complete fresh install next with a simple ship to orbit just to see how rcs + asas react, but I was hoping for a simple solution.

IIRC they increased the power and consumption of RCS thrusters.

[Rose]

No they made them all use the same power, irregardless of distance from the center.

[sneakey pete]

It seems like there's an issue with their PID control, so you can turn RCS and SAS on and it will never stablise itself properly.

[Sean Mirrsen]

It's less an issue with the PID, and more an issue with it just being a plain PID. It cannot account for wobble, it just tries to aim one end of a bendy stick in one direction while the other end keeps flailing around and makes the system try to correct again, only worsening the situation. Anything reasonably rigid, or set up in a way that allows it to rotate without flexing, will eventually be stabilized.

[LoSboccacc]

A pid can and do account for wobble.

The problem with a pid is that it is a response-specific control sistem; in other world a pid wich can control a light craft can't control a huge and heavy one and vice versa; it also applies to the amount of rcs available: too little and won't converge, to much and will wobble.

You have to aim at the precise control/weight ratio for which this particular pid is tuned to, or you can change pid index into the asas part.

Note that you can also creathe clones of the asas part, call it heavy and light and give each a different tuning. There was a mod which did that before mechjeb.

[Fikes]

I am confused. What is PID anyway and is there any short answer for fixing my crafts? Even the fully ridged ones run into this problem, though to a lesser extent.

Also it seems like in 18.1 vessel control in space without RCS was easier than it is now. In 18.2 I can't even change my heading without RCS on.

Not having ASAS and RCS for docking makes things almost impossible, and in the current situation I run out of RCS from the wobble long before I dock (I am not very good at it, admittedly.)

[sneakey pete]

wikipedia will explain it better than i can put it into words.

The answer to fixing our crafts is just going to be to wait for the next update, unfortunately.

[Putnam]

wikipedia will explain it better than i can put it into words.

The answer to fixing our crafts is just going to be to wait for the next update, unfortunately.

<3 calculus

[Fikes]

I think I will just go back down to 18.1 then...

[Kanil]

Docking seems like an immense headache. I managed to bounce off the station once, but actually getting the docking ports to line up seems... like it takes some work.

Spoiler: Almost... (click to show/hide)

[LoSboccacc]

get your doking port facing the orbit normal so it doesn't move while docking when relative to the other vessel

Spoiler: align the port so it faces the same way blue arrow direction (click to show/hide)

in 18.1 if you left asas on the other vessel on while docking it used to keep the vessel in the orientation you left it; can't say if it applies to 18.2

[kaian-a-coel]

WOW, that thing looks so cool!