Bug #9583: previously working launcher now glitching - Kerbal Space Program - Squad Bugtracker

Bug #9583

previously working launcher now glitching

Added by elthore almost 8 years ago. Updated over 4 years ago.

Status:

Closed

Severity:

Low

Assignee:

Category:

Bug Tracker

Target version:

Start date:

04/29/2016

% Done:

100%

Version:

1.1.1

Platform:

Windows

Expansion:

Language:

English (US)

Mod Related:

Votes:

Description

This craft acts very strange, at a certain point during ascent a booster stack loses all stability and individual engines go wobbly. There was no such problem in 1.1.0 or 1.0.5, and now it effects all crafts I have that use this launcher.

The problem appears after all orange tanks are dropped, but sometimes when theres 1 or 2 pairs left too. At some point the 'vector' engines get all wobbly and destroy the rocket. I tried copying the good booster stack in place of the buggy one, checked for strange struts. Im not sure what changed in the patch to cause this delayed engine wobbliness?? Crafts that used to work but that haven't been loaded since before patch now exhibit same problem.

Ancient Orbiter.craft (1010 KB) Ancient Orbiter.craft	[email protected]	elthore, 04/29/2016 03:26 AM
probe launcher3c.craft (628 KB) probe launcher3c.craft	[email protected]	elthore, 04/29/2016 03:57 AM
Serial-Stage-Gyration.jpg (370 KB) Serial-Stage-Gyration.jpg	This is the craft in mid-gyration	Renegrade, 04/29/2016 05:57 AM
Test-Gyration.craft (227 KB) Test-Gyration.craft	This is the craft file I used to reproduce this.	Renegrade, 04/29/2016 05:57 AM
output_log.txt (516 KB) output_log.txt	Gyration starts before the double-screenshot entry in this log.	Renegrade, 04/29/2016 05:59 AM

History

#1 Updated by Renegrade almost 8 years ago

File Serial-Stage-Gyration.jpg Serial-Stage-Gyration.jpg added
File Test-Gyration.craft Test-Gyration.craft added
File output_log.txt output_log.txt added

KSP Version: v1.1.1 Windows 64-bit

What Happens: Radially attached tanks gyrate in a manner not seen before in prior versions of KSP (including 1.1.0 to the best of my knowledge). They do not stop this gyration even when thrust is cut (very unusual).

Mods / Add-Ons: Pure Stock

Steps to Replicate:

Create a craft (it might have to be heavy for this to occur) with radially attached tanks for the bottom stage
Launch the craft
After a while, the tanks will start to gyrate. The gyration won't stop even when thrust is cut, which is unusual. Normally

Result: An unstoppable gyration occurs

Fixes/Workarounds:

Heavy strutting dampens this out

Notes:

The craft I've attached is only strutted lightly between stages, and only at the very bottom of the tanks internally (core tank and the six radially attached tanks are attached near the bottom inside). The original craft I had with the issue was actually slightly more heavily strutted.
I don't know if the fins and/or SRBs are truly necessary (they SEEM to be?)
the gyration doesn't start until around the time the screenshot occurs (say 50% fuel level on that stage)
I fired off two screenshots in quick succession. That's just after the gyration starts. There's nothing of real note that I can see in the log prior to that. The explosions are from aggressive phys-warping and such to try to get the gyration to stop (or get worse, which it kinda did).