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Bug #26939

Trajectory changing while rotating ship

Added by [email protected] 4 months ago. Updated 3 months ago.

Status:
Ready to Test
Severity:
Low
Assignee:
-
Category:
Physics
Target version:
Start date:
12/27/2020
% Done:

80%

Version:
Platform:
Windows
Expansion:
Core Game
Language:
English (US)
Mod Related:
No
Votes:
Arrow u r green
Arrow d r red

Description

Craft with small parts (<30kg mass but no so small that their mass is centered on the ship) act as if they accelerate when rotating.

In the attached savefile, start the small probe rotating:
+ its intercept with Duna changes by distances larger than the orbital radius of Ike,
+ the small triangle above the altimeter is orange, indicating the craft is under acceleration so no quick-saving.

Reported at https://forum.kerbalspaceprogram.com/index.php?/topic/198991-111-trajectory-changing-while-rotating-ship/#comment-3899539

Related to #26898
Workaround from that issue works here as well (beware possible side effects regarding dropping parts during EVA constructions, speculated at that thread) editing 'hPhysics.cfg' to change the line with 'partRBMassMin' to
partRBMassMin = 0.005

Some mods have lighter parts that can be independent rigid bodies, specifically the GP-004 grip pad from Breaking Ground used in some examples posted above. So for games including these parts, a lower minimum

  partRBMassMin = 0.002

probe.jpg (35.2 KB) probe.jpg affected craft, Duna intercept on that craft's trajectory [email protected], 12/27/2020 06:48 PM
imbalanced.sfs (164 KB) imbalanced.sfs savefile [email protected], 12/27/2020 06:49 PM
55500

History

#1 Updated by VoidSquid 4 months ago

Shouldn't this be listed as for KSP 1.11.0 instead of 1.10.1?

#2 Updated by [email protected] 4 months ago

  • Description updated (diff)
  • Version changed from 1.10.1 to 1.11.0

#5 Updated by [email protected] 3 months ago

  • Description updated (diff)

#6 Updated by victorr 3 months ago

  • Status changed from New to Ready to Test
  • Target version set to 1.11.1
  • % Done changed from 0 to 80

We've made some changes in the latest version of the game and would like some feedback on this issue. Thanks.

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