MechJeb2

MechJeb2

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Bug: Mechjeb case exploding at spawn randomly.

n0xiety opened this issue ยท 12 comments

commented

When reverting to launch after explosion, mechjeb case isn't attached to the hull anymore. Returning to VAB and then relaunching seems to fix it. Strange bug indeed.

commented

I've had the same thing happen occasionally with the MKS planetary camera. I heard somewhere that it has something to do with the fact that the part is so light.

commented

Oh yeah might really be the reason. There are times where i saw temperature bar over mechjeb right before explosion when the ship spawned. Maybe the new heating physics are derping at spawn and that moment of heat gain is actually effecting only mechjeb since it is the only part that has no mass?

commented

It actually has mass, it's just very, very, very light.

commented

Would it be a bad thing if it way weighed say 2kg ?

commented

I thought it actually weighed like ounces, but if you want to experiment with the weight, I'm sure sarbian would be happy to have the data there.

commented

Increasing the part's thermal mass may help fix some of these issues. I've encountered this issue a number of times, or something similar, where the case will occasionally explodes "due to overheating." I imagine it has something to do with floating point errors on the flux value, and a tiny thermal mass not being able to absorb the spikes in heat.

commented

Truth is i love the tiny mass which enables me to put mechjeb on the smallest of probes without a performance hit. Tho i wouldn't mind it being 0.01 mass if that is going to fix the issue.

commented

This will probably be fixed in 1.03 when they incorporate skin heating from DR. I know DR uses a minimum thermal mass just for this sort of problem so I would assume stock will too.

commented

Probably worth it to wait until 1.0.3 with it's skin based heating to see how that fixes the problem.

commented

I had craft randomly blowing up, so I installed Hot Spot. The MechJeb case was cycling through random temperatures, from very hot to very cold. Increasing the mass to 0.001 fixed the issue for me. I also made it "physics-less" and everything is working great again. This is on KSP 1.0.4, btw.

commented

The stock barometer part has the same issue, though not bad enough to explode.

commented

Fixed with b685975 & 75b4444