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Bug #18288

Fairings have 0 (zero) drag.

Added by [email protected] about 3 years ago. Updated almost 3 years ago.

Status:
Closed
Severity:
Normal
Assignee:
-
Category:
Physics
Target version:
Start date:
03/30/2018
% Done:

100%

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

Description

Simple as the title says, kinda surprised this one slipped through. Maybe you guys skipped the bug testing phase for 1.4.2, hopefully you learned a lesson. Anyways, the bug, how to reproduce:
Add a fairing to your vessel and fly. Results are extremely obvious when the entire vessel is enclosed in a fairing, i've made a test craft to prove this. However know that the bug does still occur if the vessel is not enclosed.

Screen Shot 2018-03-29 at 9.27.21 PM.png (2.76 MB) Screen Shot 2018-03-29 at 9.27.21 PM.png the navball showing 0 gees, the aero GUI showing zero drag affecting the craft. [email protected], 03/30/2018 04:46 AM
FC-4.craft (159 KB) FC-4.craft The test craft used. Occurs on other vessels too. [email protected], 03/30/2018 04:48 AM
noDragFairing.craft (12.3 KB) noDragFairing.craft [email protected] [email protected], 04/01/2018 09:07 PM
34949

Related issues

Related to Kerbal Space Program - Bug #18264: Fairings producing abnormal amount of dragClosed03/28/2018

Has duplicate Kerbal Space Program - Bug #18510: Rocket fully envelopped by an Airstream around Eve shows undocumented weird behaviorDuplicate04/11/2018

History

#1 Updated by [email protected] about 3 years ago

I came across this bug when attempting a land speed record run when things went south and i continued to fly with no sign of slowing down.
video clip showing the bug here: https://youtu.be/AiFL6EqtbB0

#2 Updated by [email protected] about 3 years ago

Confirming, normal drag in 1.4.1 (for payload fairings) zero drag in 1.4.2.

#3 Updated by Squelch about 3 years ago

  • Related to Bug #18264: Fairings producing abnormal amount of drag added

#4 Updated by Squelch about 3 years ago

  • Status changed from Confirmed to Investigating
  • % Done changed from 10 to 20

#5 Updated by Squelch about 3 years ago

  • Status changed from Investigating to Being Worked On
  • % Done changed from 20 to 30

This issue is related to #18264, and as a consequence, aero data is showing as null. The actual values are not being displayed correctly.

#6 Updated by Squelch about 3 years ago

  • Severity changed from Low to Normal

#7 Updated by Squelch about 3 years ago

  • Has duplicate Bug #18510: Rocket fully envelopped by an Airstream around Eve shows undocumented weird behavior added

#8 Updated by Squelch about 3 years ago

  • Status changed from Being Worked On to Ready to Test
  • Target version set to 1.4.3
  • % Done changed from 30 to 80

This is now addressed.

#9 Updated by jclovis3 about 3 years ago

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

I tested with two different shapes for my fairing. One with a cylindrical shape up to the top part and then a point, and the other with a max wide base and a closing just above the top part. The max wide base (fairing opened all the way up) caused so much drag, the ship was forced to flip over. Extending a max wide base to a much longer cylindrical shape and then a 30 degree slope to closing has the same huge drag, which demonstrates that drag is now based on the widest cross section perpendicular to the direction of movement.

I'd say this bug has been fixed.

#10 Updated by joshua.collins almost 3 years ago

  • Status changed from Resolved to Closed

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