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Bug #9496

Fuel resource usage doesn't account for "prop requirement"

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

Status:
Closed
Severity:
Normal
Assignee:
-
Category:
Gameplay
Target version:
1.2.0
Start date:
04/26/2016
% Done:

100%

Version:
1.1.0
Platform:
Windows
Expansion:
Language:
English (US)
Mod Related:
No
Votes:
Arrow u r green
Arrow d r red

Description

When "Prop. Requirement Met" is not 100%, then the main Fuel Resource usage number does not match the fuel usage of the engine.
The first image shows fuel usage on a plane with a small intake, that is not providing enough air. Prop requirement is about 80%, and the Fuel usage number (0.15 - taking rounding into account) is about 20% higher than the engine is showing for usage (.11868).
The second shows a similar plane under similar conditions with a large air intake and 100% Prop Requirement Met -- and the two numbers match (within rounding).
The savegame (career mode) is the plane that demonstrates the problem. There are many points in its high-speed/high-altitude flight envelope where Prop Requirement met drops below 100%.

I think the bug may actually cause your fuel to drain faster than it should.

screenshot7.png (592 KB) screenshot7.png [email protected] bewing, 04/26/2016 02:03 AM
bad_fuel.sfs (477 KB) bad_fuel.sfs [email protected] bewing, 04/26/2016 02:03 AM
compare.png (479 KB) compare.png [email protected] bewing, 04/26/2016 02:03 AM
113_prop_bug.sfs (87.8 KB) 113_prop_bug.sfs sandbox mode, ver 1.1.3 bewing, 07/22/2016 02:29 AM
KSP.log (212 KB) KSP.log [email protected] bewing, 07/22/2016 02:29 AM
output_log.txt (460 KB) output_log.txt [email protected] bewing, 07/22/2016 02:29 AM
screenshot22.png (873 KB) screenshot22.png [email protected] bewing, 07/22/2016 02:29 AM
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History

#1 Updated by TriggerAu over 8 years ago

  • Status changed from New to Needs Clarification

#2 Updated by bewing over 8 years ago

19243

Updated files for 1.1.3.

#3 Updated by TriggerAu about 8 years ago

  • Status changed from Updated to Confirmed

#5 Updated by Alchemist about 8 years ago

It's actually even messier - it requests both resources, and even when one is insufficient, it actually drains the second resource at full rate. The actual thrust is calculated based on total mass of resources consumed without accounting for the imbalance.

I documented a bit more on such behavior here: http://bugs.kerbalspaceprogram.com/issues/5132#note-9

#6 Updated by Squelch about 8 years ago

  • Status changed from Confirmed to Ready to Test
  • Target version set to 1.2.0
  • % Done changed from 10 to 80

This has been addressed and should be fixed in KSP 1.2

#7 Updated by JPLRepo almost 8 years ago

  • Status changed from Ready to Test to Closed
  • % Done changed from 80 to 100

Closing. No response.

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