Kerbal Space Program

Video proof of the bounces in action. Gets worse with medium landing gear and extra large landing gear.

https://www.youtube.com/watch?v=X0t6HetzihQ

Unmodded KSP 1.3.1.

Can confirm this is happening.

This is a duplicate of bug #16090 which was raised 3 weeks ago and contains further information. Given the severity of the issue it's incredible that it hasn't been hot-fixed yet. Not even assigned!

I can confirm that this issue is ship specific. I had two ships landed on Pol within 450m of each other. After time warp, only one bounced and exploded. Ships have different components though I am unable to determine which component or parts that contribute to the bounce. Using mods KAS 0.6.3, KIS 1.7 and Docking port alignment 6.7.0

Update to this. I was able to get the ships within 80m of each other. Now the bounce and explosion does not happen! Doesn't seem to be any consistency to it.

This is happening to me too. Most prominently with SSO craft with aeroplane landing gear, but also (to a lesser extent) with landing struts. Sometimes the craft just bounces high in the air, other times it just explodes. It has happened when loading a game, when exiting time warp, and when switching to a craft from the tracking station. It doesn't make any difference if the ease physics in option is enabled or not.

Same issue here.

I see it when switching-to landed vessels, and EVERY TIME on "rescue from surface" missions - I'll land the rescue ship a short way from the Kerbal, switch to the Kerbal, start walking towards my rescue vessel, and watch the vessel LEAP off the surface... in once instance crashing and burning.

While we're waiting for the official fix, I've made an attempt to remedy it in 1.3.1

https://forum.kerbalspaceprogram.com/index.php?/topic/169206-131-worldstabilizer-bugfix-for-vessels-bouncing-on-scene-load/

Temporary fix: set textures to lowest, set physics computations to lowest, then the moment craft is loaded, activate x2 time warp (not x5). Then return to normal time. This may interrupt the bouncing. Does not fix the bug nor will it help for those craft which explode instantly on load. It may help you load a bouncy plane and retract its landing gear to prevent the bounce until the hotfix is released.

Also try the above by bringing another vehicle within 200m of the bouncing craft by using 2x time warp, then return to normal time.

These bugs will always be increased by time warp.

I suspect it has to do with the new wheel module not easing in physics properly, and not remaining fixated across save-state.

Please explain reason to change priority back to Normal. This bug makes refueling on Gilly impossible as the ship explodes coming out of warp. You can't expect to sit there for several days watching it refuel in real time. Warp must be fixed to make this playable, which makes this a critical issue. Version 1.4 is soon to be released and there should have been more than 10% progress on this by now. Nobody is going to purchase the Making History expansion if this is not fixed in the base game.

I play pure Vanilla, no mods, on Windows 10 in 64-bit mode. Started a new game with new ships so as not to reuse any old data and bug persists.

I can confirm that this issue still happens on 1.4.5.2243. This is a critical bug and should be fixed above all else. It makes base building almost impossible as vessels on the ground suddenly shoot into the air when visiting them.

Workaround:
For any vessels that form part of a base, I have modified the save game so that damperTweakable = 10 for all landing legs. This seems to have resolved the bouncing issues that result from the physics when coming out of time warp.

I found another workaround which doesn't require editing the save game. Instead, I set auto-struts to the root for all the docking ports which connect the base together. I discovered this after my base would explode when undocking one of the base modules. Now, I'm able to undock safely without the base tearing itself apart.

The start-up problems with the physics simulation for landed craft were fixed in 1.4.1.
That is, the save-file attached at the top of the report shows only a 1/4 meter settling when we first switch to the craft, or when we come out of 'on-rails' time-warp.

Possibly the confirmation above for versions after 1.4.1 refers to
the jumping we had before version 1.5 when docking/undocking/command-chair-exiting, #19343 #19402 #19474
edit: which is now back #21432 or never fully fixed
or the smooth bouncing we have with #17830 #19427 #19491
or maybe the kick you can get when bottoming out the landing legs or landing gear #20682

Whale_2's mod addresses the initial physics-startup, and you can see at his thread linked above that he is surprised that people want the mod for KSP versions 1.4+.
If anybody still sees a jump upon the initial load of physics, they should attach a craft file that shows the problem, because the original example no longer shows any problem.

The issue still happens with landed craft as well. I had a base on Mun that was happily planted on the surface. I landed a ship nearby and then saved the game. But, the base now launches into the air when loading the save game.

The issue seems to trigger substantially less frequent in KSP 1.7.0.2483(x64), I did experienced it once however with a parked craft after stopping 100x time-warp (haven't been able reproduce it though). The craft bounced up violently and the brakes didn't work afterwards (even after switching them off and on again), resulting in the craft sliding off the runway.