Can I comfirm which parts are massless?

[Redshift OTF]

I'm hoping to make an ultra light glider/plane and I have heard many people say that this object or that object is massless. Can I confirm for sure which objects the game considers having no mass? I believe it is:

Cubic Octagonal Strut

Octagonal Strut

Small Gear Bay

All Ladders

Z-100 Rechargeable Battery Pack

Strut Connectors

That's all that I can think of. The Small Gear Bay I am interested in the most as I want to know whether I will receive any benefits from jettisoning them after take off. Also are the OX Stat single piece solar panels considered massless as they are so light? Am I confusing massless and physicsless objects?

Thanks in advance.

[duncan1297]

i'm pretty sure the battery packs have mass.

[Javster]

i'm pretty sure the battery packs have mass.

But no physicsignificance. The physics don't apply.

[Redshift OTF]

i'm pretty sure the battery packs have mass.

I've heard people using Ion Landers saying they are massless and can be spammed to provide a large reservoir of electricity.

[Claw]

Here's a list of "physicsless" parts in KSP v0.23.5.

http://forum.kerbalspaceprogram.com/threads/75951-PhysicsSignificance-related-problems?highlight=physicssignificance

People say "massless" and "physicsless" sort of interchangeably. That's because there's a flag in the part.cfg file that says "PhysicsSignificance = 1". So in-flight, any mass is ignored. Hence "massless."

[Redshift OTF]

Here's a list of "physicsless" parts in KSP v0.23.5.

http://forum.kerbalspaceprogram.com/threads/75951-PhysicsSignificance-related-problems?highlight=physicssignificance

People say "massless" and "physicsless" sort of interchangeably. That's because there's a flag in the part.cfg file that says "PhysicsSignificance = 1". So in-flight, any mass is ignored. Hence "massless."

Ah interesting! Thank you. I notice it doesn't list the plane wheels/small gear bay there. People are always saying these are physicsless and to ignore it's effect on the COG icon in the SPH/VAB. Is this correct?

[Claw]

They used to be physicsless in v.0.23.0. However, in v0.23.5 the "PhysicsSignificance" line is gone. I haven't tested it yet, so unless it's hard coded then they should have mass.

EDIT:

Hmm, interesting. I have to correct myself. I went and tested and the Small Gear Bay is indeed still massless in flight. It has been a while so I went back and looked. The part.cfg from version 0.23.0 also does not havethe PhysicsSignificance line. So it must be hard coded.

So yes, the small landing gear is still "massless" in flight. Just note that the SPH will lie to you about the position of the CoM when you're building (like you said).

Edited April 15, 2014 by Claw

[Redshift OTF]

Ah ha! Thank you. Now to build my plane.

[Pecan]

A whole other thread: http://forum.kerbalspaceprogram.com/threads/76173-Massless-parts?highlight=massless+parts