thx Paul for your Answer.
Otherwise i would pullout a 5V pin from one ESC and connect it to this BEC Pin, this would be a quite sensefull config.
It would be easier if there were a circuit diagram and not only the layout of the board.
Looks like it would you publish it?
It can be difficult to trace the circuit lines on the black material.
I would therefore like the pin that's looked into the void (BEC pin) lead.
Serial interface on the display I have 5V, GND and RX. RX tentatively associated with TX and RX on the Flyduino, its same effect.