Bug #5172
Invert Control Surface
100%
Description
Like shown in the screenshot I constructed a plane which has its control surfaces behind the center of mass.
When I want to lift off, then I normally press [S]. But when I press [S] with this plane, the control surfaces turns down. So I have to press [W] to steer up. But that's not the biggest problem, the biggest problem is, that the SAS works in the wrong direction!
Perhaps it's because the main wing is attatched in front of the center of mass?
PS: Actually it's the new 1.0.3 version.
| Control Surface.png (3.45 MB) Control Surface.png | Screenshot - Control surfaces marked red | ||
| Airtram 001.craft (141 KB) Airtram 001.craft | My (not very well) constructed plane | ||
| CoL invesion.craft (21.6 KB) CoL invesion.craft | Near-minimum reproduction example using original parts | ||
| screenshot0.png (1.03 MB) screenshot0.png | Center of Lift picture | ||
| screenshot1.png (1.03 MB) screenshot1.png | Center of Lift turns normal after removing elevons | ||
| screenshot2.png (1.05 MB) screenshot2.png | 5-part reproduction: normal position | ||
| screenshot3.png (1.04 MB) screenshot3.png | 5-part reproduction: CoL inverted after turning elevons just one step |
History
#1
Updated by Kasuha almost 9 years ago
Updated by - File CoL invesion.craft CoL invesion.craft added
- File screenshot0.png screenshot0.png added
- File screenshot1.png screenshot1.png added
- File screenshot2.png screenshot2.png added
- File screenshot3.png screenshot3.png added
- Status changed from New to Confirmed
- % Done changed from 0 to 10
I can confirm the behavior. Culprit are the Elevon 3/Big-S Elevon 1/Big-S Elevon 2 combo mounted on the trailing edge of FAT-455 Aeroplane Wing. Together they turn the Center of Lift indicator upside down and that leads to the game applying control surfaces action inversely.
KSP 1.0.4 is needed to load both craft files.
Behavior can be reproduced even on pair of non-east/west mounting edges and single pair of elevons rotated in 5 degree increments.
#2
Updated by sal_vager over 8 years ago
Updated by - Severity changed from Normal to Low
This issue occurs because the X axis of the control surface is the wrong side of the CoM, this is how KSP knows which way to move the part, it has nothing to do with wing placement.
Workaround is to ensure the x axis of the control surface is correct relative to the vessel CoM.
#3
Updated by TriggerAu almost 8 years ago
Updated by 
- Status changed from Confirmed to Needs Clarification
- % Done changed from 10 to 0
#4
Updated by TriggerAu over 7 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