Static Solar Panel resized to small size results in physics mass different from stated part mass and thus incorrect dV of craft as calculated in MechJeb

[SAOBunk]

Static Solar Panel resized to small size results in physics mass different from stated part mass and thus incorrect dV of craft as calculated in MechJeb

[SAOBunk]

Some further testing suggests the minimum mass the solar panel can have for the physics sim is 2kg.

[lpgagnon]

previous discussion of what seems to be the same issue
https://discord.com/channels/319857228905447436/319857228905447436/985972007797674004

[SAOBunk]

The issue is not present when Principia has been installed

[siimav]

So what is happening here is that KSP internally forces a minimum mass of 2kg on part RigidBodies. Thus the issue isn't limited to ROSolar and any physical part will trigger the discrepancy between calculated and actual dv.

Weirdly though, decreasing partRBMassMin in PhysicsGlobals to 1kg doesn't help at all. However what does work is overriding minimumRBMass at part level to a smaller value.