Why? Because this: Red - Lander Green - Mothership I think that's explain all Anyway I pressed that button call jettison but nothing happend. Maybe I use it wrong or I don't know how to use it The only thing what I can do with that heatshield is open and close. Here I would like to mention one issues. Always when I try to launch rocket I have got open that heatshield. What's is wrong? It is also happen when i use F5 to quick save and then F9 to load or just choose ship from list in tracking sation and click fly. Always the same result - open heatsield. Edit: It's weird I delivered just a moment ago my rover on Eve surface. Of course I used 6.25m heatshield with sock part.cfg (CoMOffset = 0.0, 3.0, 0.0) and there wasn't any problem with stability. Maybe before it was too light weight of pod for this heatshield but I think for future possible stability problems CoMOffset should be change for CoMOffset = 0.0, -1.2, 0.0. The center of mass should be on the bottom not on top. Just like for the other heatshields.