Today my brother and me went to a near sports field to further test the vehicle. After the first tries it was huge fun to fly. Against my post of yesterday I flew with the damaged prop several meters higher than 3 m, no problem at all. But I still need a lot more practice to fly it smoothly. The behavior of the self-leveling feature was very strange. I wasn't able to make it work correctly. I should probably update the KK2 firmware as I found some information in the web, which says it was improved since V 1.2. I also started to think about a foldable frame to make transportation easier.
See you in a week, after my vacation!