ESC are on the top part of the frame below Rpi. I’m working on larger frame spacers (going from 35 to 55mm) in order to have all electrical wiring and ESC inside the frame.
I had a bad take off the other day. Octo fall on the side and one arm was broken? It happened arm wall was thinner than average (0,75mm instead of 0,85 or 1mm) and not enough stiff (bargain price).
I ordered a new length (1mm wall + 30% kevlar wrap). The bird is back on the flight line.