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Bug #21949

Control Surfaces' Pitch/Yaw/Roll Direction Wrong Depending on Rotation of the Surface

Added by Vycma 5 months ago. Updated 2 months ago.

Status:
New
Priority:
Low
Assignee:
-
Category:
Controls and UI
Target version:
-
Start date:
04/22/2019
% Done:

0%

Version:
Platform:
Windows
Expansion:
Breaking Ground, Core Game, Making History
Language:
English (US)
Votes:
Arrow u r green
Arrow d r red

Description

Depending on the rotation of a control surface the pitch/yaw/roll (deployment) direction is opposite to a given control input. It is counter to the direction that should be chosen, based on the relative longitudinal position of the control surface to the center of mass of a craft.

Minor deviations in rotation (~10°) are enough to invert the actual control input.

Issue exists at least since version 1.1.0 (see related issues).

Limitation of Workarounds (Inverted Deployment / Authority Limiters)

For simple toggled deployment the issue can be resolved by setting "Deploy Direction" to "Inverted". This setting however does not effect flight control inputs.

Setting a negative Authority Limiter value as a workaround for flight controls does not resolve the issue, since only pitch/yaw can be adjusted this way to give the desired direction, however previously correct roll behaviour is then simultaneously incorrectly inverted.

Reproduction Steps

1. Attach swept wing sections to a fuselage.

2. Attach control surfaces to the wing sections.

3. Rotate every other control surface in the XY-plane (even 10° should be enough).

4. Launch the craft and pitch.

5. Observation: Some control surfaces in front and behind the CoM will pitch correctly even when rotated. Closer to the CoM the rotated surfaces will invert the input.

Related Issues

https://bugs.kerbalspaceprogram.com/issues/9407
https://bugs.kerbalspaceprogram.com/issues/9460
https://bugs.kerbalspaceprogram.com/issues/20847

General Layout.jpg (269 KB) General Layout.jpg Test craft. Center of mass is marked with the plate cross on the fuselage. Vycma, 04/22/2019 04:50 PM
Pitch Up Input.jpg (283 KB) Pitch Up Input.jpg Pitch up input via keyboard controls. Approximately half of the rotated control surfaces have the input inverted, even when only slightly rotated. Vycma, 04/22/2019 04:51 PM
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History

#1 Updated by Vycma 5 months ago

  • Description updated (diff)

#2 Updated by Vycma 5 months ago

  • Description updated (diff)

Correction: The minimum angle of rotation compared to a reference control surface seems to be ~10° (not 7.5°).

#3 Updated by Vycma 3 months ago

Update:

Issue still exists in 1.7.2

#4 Updated by Vycma 3 months ago

  • Subject changed from Control surfaces' Pitch/Yaw/Roll direction wrong depending on rotation of the surface to Control Surfaces' Pitch/Yaw/Roll Direction Wrong Depending on Rotation of the Surface
  • Version changed from 1.7.0 to 1.7.2
  • Expansion Breaking Ground added

#5 Updated by Vycma 2 months ago

  • Version changed from 1.7.2 to 1.7.3

Update:

Issue still exists in 1.7.3

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