All,  This is too short for a tutorial, so I'm going to just leave this here. Are you having problems with reentry packages tumbling? Part placement and stacking order matters in KSP. There are some things you can do to reduce or even eliminate the tendency to flip. Principles for aerodynamically stable reentry: 1: The center of gravity should be as close to the ablator as possible. Stack your capsule so that physically compact and dense components ride near the ablator,