Episode 11 was terrific, if somewhat unlikely. Watching it, I realized that this may be one of the best moe shows I've ever seen, in part because it doesn't depend on moe for everything, in part because the moe is so pure and the bearers of it are a great combination of small/weak and smart/strong.
This is a small, sometimes perfunctory show, but it has something special. The girls' combination of moe and toughness is strong, and there are also the rockets, the science, the tropics, the humor, and the interesting human interaction, as well as the good design. And Sendai Eri's approach to the character of Yukari is really proving its worth as we go on.