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Bug #3334

Rotational velocity damped in space

Added by monksealpup about 10 years ago. Updated about 8 years ago.

Status:
Closed
Severity:
Low
Assignee:
-
Category:
Physics
Target version:
-
Start date:
10/09/2014
% Done:

100%

Version:
0.24
Platform:
Win32
Expansion:
Language:
English (US)
Mod Related:
No
Votes:
Arrow u r green
Arrow d r red

Description

When in orbit around Kerbin, if I use spin jets to spin up a small satellite load in preparation for a burn, when the spin jets exhaust their fuel supply the rotational rate drops fairly quickly (e,g. 10 rev/sec -> 5 rev/sec in about 15 seconds). It should maintain its rotational rate until another force acts upon it (or you switch away/warp, etc.).

3334.craft (5.63 KB) 3334.craft Simple probe for testing Squelch, 10/09/2014 01:24 PM
3334-quicksave.sfs (24 KB) 3334-quicksave.sfs Simple Probe in orbit save Squelch, 10/09/2014 01:26 PM

History

#1 Updated by Squelch about 10 years ago

Could you please confirm that SAS is not in effect?

#2 Updated by PixelClef about 10 years ago

OS: Mac OS 10.9.5
KSP: 0.25.0.642

Built my own satellite, put it into orbit and spun it like a pinwheel until the RCS ran out. I didn't see a dramatic slow down, even after several hundred dV of ion thrust. I had SAS off during the spinning test. It's still going, spun all the way around the dark side of Kerbin. I did observe some slowing of the rotation, but not the dramatic slowing described.

It's unclear to me if this is a confirmation of the effect or not. I agree that a body rotating in space should continue to do so.

#3 Updated by Squelch about 10 years ago

I am able to confirm that rotations are damped in space. A simple Probodyne HECS with a couple of Sepratrons attached will slow significantly at first, and then gradually slow down over time.

I have attached a simple test probe and a quicksave with it in orbit @100km above Kerbin.

This will be forwarded to the developers.

#4 Updated by Squelch over 9 years ago

  • Platform Win32 added
  • Platform deleted (Windows)

#5 Updated by TriggerAu over 8 years ago

  • Status changed from Confirmed to Needs Clarification
  • % Done changed from 10 to 0

#6 Updated by TriggerAu about 8 years ago

  • Status changed from Needs Clarification to Closed
  • % Done changed from 0 to 100

Closing this report out for now. If you find it is still occuring in the latest version of KSP please open a new report (and this one can be linked to it.) For best results, the wiki contains really useful info for when creating a report http://bugs.kerbalspaceprogram.com/projects/ksp/wiki.

You can also ask questions about the bug cleanup in the forum here: http://forum.kerbalspaceprogram.com/index.php?/topic/143980-time-to-clean-up-the-bug-tracker/ and tag @TriggerAu to get my attention

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