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Bug #22932

Deploy Direction briefly changes when control-surface crosses CoM

Added by k-ohara5a5a@oco.net about 1 month ago. Updated 7 days ago.

Status:
Confirmed
Priority:
Low
Assignee:
-
Category:
Gameplay
Target version:
-
Start date:
06/19/2019
% Done:

10%

Version:
Platform:
Windows
Expansion:
Core Game
Language:
English (US)
Votes:
Arrow u r green
Arrow d r red

Description

Whenever the actuation axis of a deployed control surface crosses the center of mass of the craft,
the direction of deployment quickly reverses, then returns to its correct direction at normal actuation speed.

In the base game, we can most easily move the CoM by pumping fuel. The deployed winglet glitches when the pumped or moves the center of mass across its actuation axis. (If we un-deploy the winglet and use it for yaw, the direction of yaw control correctly reverses when the CoM moves across the actuation axis. The deploy direction, however, is not supposed to reverse, and does not reverse in the long-term, except for a momentary glitch with takes a second or two to recover.)

This rarely causes problems in the base game, but with Breaking Ground, the control surface can easily be moved so that its actuation axis crosses the CoM. The second attached craft shows the glitch by actuating a hinge.

In actual use, this glitch came up quite quickly after Deploy Limit was usefully added to axis groups:
https://forum.kerbalspaceprogram.com/index.php?/topic/185577-alternating-lift-on-rotor-blades/
The trigger for the reversal of direction is not so easy to see, however, in that natural use-case.

DeployDirectionTanks.craft (9.75 KB) DeployDirectionTanks.craft base-game example, shift ore k-ohara5a5a@oco.net, 06/19/2019 06:35 AM
DeployDirection.craft (12.5 KB) DeployDirection.craft easier example using breaking ground k-ohara5a5a@oco.net, 06/19/2019 06:35 AM
deploy.jpg (68 KB) deploy.jpg k-ohara5a5a@oco.net, 06/19/2019 06:36 AM
47399

History

#1 Updated by diomedea about 1 month ago

  • Status changed from New to Confirmed
  • % Done changed from 0 to 10

Good catch!

#3 Updated by Vycma about 1 month ago

This is related to the issue here:

https://bugs.kerbalspaceprogram.com/issues/21949

#4 Updated by k-ohara5a5a@oco.net 7 days ago

  • Subject changed from Deploy Direction briefly unnecessarily changes with CoM to Deploy Direction briefly changes when control-surface crosses CoM

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