Ready to Ragequit over ship shaking violently and breaking up on entry

[Darth_Wayner]

I've spent well over a month creating a mission to Duna that will get me all science in one trip. The ship is massive and was constructed in orbit. Surprisingly it's not my massive ship that won't survive this game's buggy code but the simplistic lander. I'm on my last biome on Duna and would like to move on to Ike but appears my mission is over due to some sort of bug. Pretty pissed off atm.

My lander begins gyrating violently on my approach, SAS goes nuts trying to correct and the whole ship breaks apart. I can't reproduce this bug, it never happens at the same point in my approach (different altitude, speed, heading, with and without gimbals locked, etc.) but I'd does happen EVERY time. I've gone back several saves, quick saved, exited to desktop...tried everything I can think of.

mission is done and I'm done with KSP if I can't resolve this.

i'm running full vanilla with no mods, Steam, windows 7 64-bit.

Is there any fix for this?

[Claw]

A picture of your craft would help, but my guess is that your small craft has a lot of control authority (reaction wheels and/or aero surfaces)...And that you are possibly using the Pilot Abilities type SAS (and not the Stability Assist).

The new SAS abilities (basically all the ones except stability assist) are somewhat unstable with craft that have a lot of control authority for their size. This is pretty easy to have happen with a small craft that has a torque wheel and gimballing engines.

Hopefully that helps a little.

Cheers,

~Claw

[Darth_Wayner]

A picture of your craft would help, but my guess is that your small craft has a lot of control authority (reaction wheels and/or aero surfaces)...And that you are possibly using the Pilot Abilities type SAS (and not the Stability Assist).

The new SAS abilities (basically all the ones except stability assist) are somewhat unstable with craft that have a lot of control authority for their size. This is pretty easy to have happen with a small craft that has a torque wheel and gimballing engines.

Hopefully that helps a little.

Cheers,

~Claw

Thanks for the reply claw, although I'm pretty certain that's not the issue. The craft is quite simple, actually. It's a mk1 lander can, with 4 large rockomax x200-16 tanks attached radially. I have a science jr on top with a docking port on top of that. I have a circular under slung battery pack, two stratus v roundeified RCS tanks, landing stRuts outboard, 2 goo cans and miscellaneous other utility fittings such as nose cones, RCS ports, thermometers, etc. the engines are 4 rockomax R55s.

So, the only control authority aboard is the lander can and the engine gimbals. The engines are not situated perfectly radially, so maybe that's it? Either way, the thing shouldn't be convulsing and snapping its own back. I'm playing science mode, so I'm not sure if the "SAS abilities" you mention are active in science mode.

[bakanando]

If you have your ship pointing retrograde with the SAS options, if your ship stops descending and starts going up the ship will try to flip too. It won't do it smartly, so it will just start flipping around until it points exactly there or breaks apart in atmo. If you are using these options, I'd recommend to use it just for the initial breaking burn. When you get close to 10m/s change to normal stability assist.

If this is not your case, some picture would help pinpointing your problem. One of your craft, and one sometime after the spinning/shaking starts.