Physicsless part
From Kerbal Space Program Wiki
Massless Parts
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.
List of massless parts
Correct as of 0.23.5
- Cubic_Octagonal_Strut
- Octagonal_Strut
- Small_Gear_Bay
- All Ladders
- Z-100_Rechargeable_Battery_Pack
- Strut Connectors