The serial connector in this wing half is for servos, for the XY sensor, and for a 3s 2200mah lipo which powers the osd and video. This battery is accessed through a bay cover build in the top of the wing next to the aileron servo bay. The lipo by the way couterbalances the weight of the pan&tilt system located in the other wing half. The wing assembling make is unnecessary to connect individual cables. The only connection which must be done manually is the silicon pitot tube.
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Nice installation, is that serial connector for the servos?