I've seen that one before, and really enjoyed it...In fact it gave me some ideas for future projects with my students...
So by tippy...With my first quad, an AR-drone, the battery eventually went. The battery I tried replacing it with was a lipo that I had laying around from a robotics project. It was much heavier than the original battery.
While the quad flew the added mass made sharp turns difficult because the weight and location of the battery would overpower the motors.
It would become tippy...
That said, I know that isn't the case with the mixuko build. The camera is simply not heavy enough to cause this effect, and the power to weight ratio is probably something insane. though there is another way in which this might feel tippy though I'm not sure that is possible either.
By having the camera so far from the flight plane, when the quad turns the face of the camera lens moves through an ark. Though here again I am sure it wouldn't be noticeable, and even if it was I'm not sure how that would effect the pilot at all.
now I almost want to do an experiment moving a camera farther and farther from the flight plane of a quad to see at what point it becomes a problem.
That said, C0d3M0nk3y This is a sweet little quad. I'm amazed at how clean it is, and how everything fits into such a small package.
DB