Difference between revisions of "Physicsless part"

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(Expanded and clarified a bit.)
(Correction of internal contradiction. Update of version to reflect the added flags in the part list.)
 
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Some parts within the game are listed as having a small mass, but in the config file a flag is set "PhysicsSignificance = 1". This has the effect that in flight physics calculations such as mass and drag are not calculated for that part.
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[[File:RV-105 RCS Thruster Block Delta V test.png|thumb|Delta-V comparison of three [[RV-105 RCS Thruster Block]] as massless and normal parts, before the changes introduced in [[1.0.1]]]]
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'''Physicsless parts''' are parts where the physics don't work in the usual way. The mass of the part and the drag experienced by it are added to the parent's part. The part itself has no mass nor drag at its point of placement, but it still contributes to the vehicle's total mass and drag; in short, during movement, the added physicless parts would not generate mass-shift and drag that affects lateral stability. Before [[1.0.1]] the mass and the drag weren't added to the parent but just ignored. It is influenced by the <code>PhysicsSignificance</code> flag in the part configuration which must be set to 1 to make it physicsless.
  
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When constructing a craft, the [[root part]] can't be such a part.
  
== List of massless parts ==
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== Behaviour ==
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A craft with only physicsless parts starts to oscillate after a short time and then starts to destroy itself. But this is usually not possible because the root part is always not a physicsless part. The game can change the property on the fly, so that when a new root part after decoupling would be physicsless the game removes that special status.
  
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== List of physicsless parts ==
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Physicsless parts as of 1.10.1:
  
''Parts with PhysicsSignificance = 1 as of 0.23.5''
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{{:Physicsless part/List}}
  
* [[Cubic_Octagonal_Strut|Cubic Octagonal Strut]]
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Note that several parts, such as the [[LT-2 Landing Strut]], have <code>PhysicsSignificance = 0</code> in its part.cfg. This does nothing, and the part behaves as normal.
* [[Octagonal_Strut|Octagonal Strut]]
 
* [[Pegasus_I_Mobility_Enhancer|Pegasus I Mobility Enhancer]]
 
* [[Telus_Mobility_Enhancer|Telus Mobility Enhancer]]
 
* [[Telus-LV_Bay_Mobility_Enhancer|Telus-LV Bay Mobility Enhancer]]
 
* [[Z-100_Rechargeable_Battery_Pack|Z-100 Rechargeable Battery Pack]]
 
* [[Z-400_Rechargeable_Battery|Z-400 Rechargeable Battery]]
 
* [[OX-STAT_Photovoltaic_Panels|OX-STAT Photovoltaic Panels]]
 
* [[FL-A5_Adapter|FL-A5 Adapter]]
 
* [[Small_Hardpoint|Small Hardpoint]]
 
* [[TR-38-D|TR-38-D]] (Size 3 decoupler)
 
* [[Communotron_88-88|Communotron 88-88]]
 
* [[Communotron_16|Communotron 16]]
 
* [[Place-Anywhere_7_Linear_RCS_Port|Place-Anywhere 7 Linear RCS Port]]
 
* [[RV-105_RCS_Thruster_Block|RV-105 RCS Thruster Block]]
 
* [[Double-C_Seismic_Accelerometer|Double-C Seismic Accelerometer]]
 
* [[PresMat_Barometer|PresMat Barometer]]
 
* [[GRAVMAX Negative Gravioli Detector|GRAVMAX Negative Gravioli Detector]]
 
* [[2HOT Thermometer|2HOT Thermometer]]
 
* [[Illuminator Mk1|Illuminator Mk1 (spot)]]
 
* [[Illuminator Mk2|Illuminator Mk2 (wide)]]
 
* stackPoint1
 
  
''Parts that are massless due to their part type, but do not have the PhysicsSignificance flag set''
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== See also ==
 
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* [https://www.youtube.com/watch?v=tNMnDrLCW60 Kerbal Space Program - Your Physics Have No Power Over Me!]” by Scott Manley
* [[Small Gear Bay]]
 
* [[EAS-4 Strut Connector]]
 
* [[FTX-2 External Fuel Duct]]
 
 
 
Note that the [[LT-2 Landing Strut]] has PhysicsSignificance = 0 in its part.cfg. This does nothing, and the part behaves as normal.
 
  
 
{{Parts}}
 
{{Parts}}

Latest revision as of 09:14, 6 January 2021

Delta-V comparison of three RV-105 RCS Thruster Block as massless and normal parts, before the changes introduced in 1.0.1

Physicsless parts are parts where the physics don't work in the usual way. The mass of the part and the drag experienced by it are added to the parent's part. The part itself has no mass nor drag at its point of placement, but it still contributes to the vehicle's total mass and drag; in short, during movement, the added physicless parts would not generate mass-shift and drag that affects lateral stability. Before 1.0.1 the mass and the drag weren't added to the parent but just ignored. It is influenced by the PhysicsSignificance flag in the part configuration which must be set to 1 to make it physicsless.

When constructing a craft, the root part can't be such a part.

Behaviour

A craft with only physicsless parts starts to oscillate after a short time and then starts to destroy itself. But this is usually not possible because the root part is always not a physicsless part. The game can change the property on the fly, so that when a new root part after decoupling would be physicsless the game removes that special status.

List of physicsless parts

Physicsless parts as of 1.10.1:

Note that several parts, such as the LT-2 Landing Strut, have PhysicsSignificance = 0 in its part.cfg. This does nothing, and the part behaves as normal.

See also