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Feedback #5930

Unable to make stuff sink in the waters of kerbin dispite the density of LFO being 5 times greater than water.

Added by Comwarrior69 over 8 years ago. Updated almost 8 years ago.

Status:
Needs Clarification
Severity:
Normal
Assignee:
-
Category:
Gameplay
Target version:
-
Version:
1.0.5
Platform:
Windows
Expansion:
Language:
English (US)
Mod Related:
No
Votes:
Arrow u r green
Arrow d r red

Description

KSP 1.0.5.1028 unmodded
No errors in log

Unable to make stuff sink in the waters of kerbin dispite the density of LFO being 5 times greater than water.
A Mk3 large tank weighing 57t containing 10,000 units of liquid fuel that is 5 times denser than water should sink.

75% of my twitch chat agree, please look into this.

History

#1 Updated by Squelch over 8 years ago

  • Status changed from New to Need More Info

The unit of measure used in KSP is 5 litres per unit.

This can be deduced from:
Jumbo-64
  • Dry mass: 4t
  • Wet mass: 36t
  • Net: 32t
  • Volume 7.5m long, 2.5m diameter = 36.8m^3
  • From RP-1/LOX as an analogue to LFO, density is 8.1-1.02kg/l
  • Approximating skin volume and dead space (cylinder with hemispherical end-caps within a cylindrical frame) leaves ~32m^3 which is 6400 units of fuel or 200u/m^3 therefore 5 litres/unit at close to the density of water.

The Jumbo-64 should just float assuming the above, and a quick test shows it to be about right. This also translates to the other tanks (LF and LFO are assumed equal in density per unit volume)
Here's a comparative test between the Jumbo-64 and the Mk3 LFO long

Credit goes to Taniwha for workings

That said, The first image does show the fuselage to be too high in the water, so something isn't right. It's hard to determine what the second image is demonstrating.

Could you please confirm the version and build? Also, please verify your installation if using Steam, and pay particular attention to physics.cfg which may need regenerating or replacing with the current copy.

#2 Updated by Comwarrior69 over 8 years ago

100% fresh install (non steam), the build as mentioned is 1.0.5.1028

The second pix shows the nose and tail removed so only the mk3 tank... well as best as i can get it in order to get to the water

#3 Updated by TriggerAu almost 8 years ago

  • Status changed from Need More Info to Needs Clarification

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