User blog comment:Warwolf 51/The Random War Room/@comment-24301892-20140203041048/@comment-11135771-20140203045322

Flying ships have a tendency to mess up a bit if they're too small, the base won't submerge and if you try adding propellers to make it go under it will tip over. I recommend making it larger so that the base will submerge properly (though it might be big enough as it is, not sure exactly what the minimum is).