Potential fix for 1.1 landing gear jittering

[GoSlash27]

Symptoms: Craft skates/ skitters around the surface when spawned. Brakes are ineffective. Craft bounces uncontrollably on surface. Craft flips. Landing gear explodes. Wheels vibrating rapidly. Gear explode on landing.

It is more likely to happen in vehicles with multiple sets of landing gear, extremely light craft, and extremely overloaded craft.

I was able to cure this problem in the LY-01 gear with the following adjustments to the .cfg file:

MODULE
    {
        name = ModuleWheelSuspension
        baseModuleIndex = 0
    
        suspensionDistance = 0.2//0.1
        suspensionOffset = 0.0// 0.0
        targetPosition = 0.6//0.9    
        springRatio = 15//30
        damperRatio = 0.3//1.0    
        boostRatio = 0.0
        
        suppressModuleInfo = True
    }

A high spring ratio increases the frequency of wheel oscillations. If it is too high, the wheel will bounce rapidly in place. If it is too low, the wheel may experience excursions beyond it's travel limits, causing destruction of the gear.
 A high damper ratio will result in erratic behavior, and possibly positive feedback to oscillations. I don't think this value should be higher than 1 under any circumstances.
Giving the gear some room to articulate helps tremendously, especially if it's not seeking a fully (or nearly fully) compressed stable state. This allows for a lower spring ratio.

 I believe similar .cfg edits can be made to alleviate this problem in other gear and struts as well.

HTHs,
-Slashy

 

 

[Artimus]

I'm experiencing the same issue on my minmus base. It starts moving by ~4 m/s with increasing bouncing until the legs cannot handle stress any more. I've got to put the gears up as fast as possible anyway or they'll explode right on physics initialization. But what I also experience is that the Landing gear lowers down beneath the surfance (greater flats) and even the flag i placed seems to have no connection to the ground any more, since it tips over when I enter the station nearby.

I even tried to launch and re-land it veeeeeeery gently for several times, but as soon as the legs touch the ground the whole base gets pushed up (bounces) very hard and begins to slide and jump along the ground.

Edited April 23, 2016 by Artimus

[g00bd0g]

Excellent work Slashy! I am having the exact same issues. This is a pretty massive and obvious bug, not sure how it slipped through the cracks. I am hoping Squad implements your fix, or finds the root cause, and pushes an update ASAP. Non-functional landing gear ruins a huge part of the game.

[GoSlash27]

5 hours ago, Artimus said:

I'm experiencing the same issue on my minmus base. It starts moving by ~4 m/s with increasing bouncing until the legs cannot handle stress any more. I've got to put the gears up as fast as possible anyway or they'll explode right on physics initialization. But what I also experience is that the Landing gear lowers down beneath the surfance (greater flats) and even the flag i placed seems to have no connection to the ground any more, since it tips over when I enter the station nearby.

I even tried to launch and re-land it veeeeeeery gently for several times, but as soon as the legs touch the ground the whole base gets pushed up (bounces) very hard and begins to slide and jump along the ground.

Artimus,

I was playing with the LT-1 struts this morning and noticed the same issue. It was a clipping problem due to incorrect suspension offset in the .cfg file. I'll see if I can reproduce your problem and recommend an edit.

Best,
-Slashy

 

 

[GoSlash27]

Artimus,

Try this .cfg file for the LT-2. See if it fixes your problem.

http://wikisend.com/download/839402/landingLegLT-2.cfg

Be sure to keep the original .cfg file with a different name so you can revert to it if needed. Please let me know if it fixes the problem.

Best,
-Slashy

[V7 Aerospace]

While we wait for Squad to fix landing gear issues, why don't we go old-school and use winglets, or structural parts as landing legs? (Obviously this doesn't fix the problem with space plane landing gear, but at least it's an alternative)

[severedsolo]

That alone seems to have solved about 99% of my problems with early planes! Cheers man,

[Artimus]

It did not have any effect for me, but for devs or whoever else cares about the problem, here is a savegame to securely reproduce the problem:

1. Enter the tracking station.
2. Select "Ceres Base"
3. Watch the show...

persistent.zip

[JedTech]

On 4/24/2016 at 0:10 PM, severedsolo said:

That alone seems to have solved about 99% of my problems with early planes! Cheers man,

Who are you replying to? What solved 99% of your problems? Please don't leave me hanging like that.

[severedsolo]

8 hours ago, JedTech said:

Who are you replying to? What solved 99% of your problems? Please don't leave me hanging like that.

Ha, I was replying to the OP. SOrry for leaving you hanging his config for the fixed wheels solved the problem.