Originally Posted by four stroke pwr
The build instructions from RC Factory emphasis this.. second page, Diagram C state: "IMPORTANT: if you glue the wing in normal (not inverted) position- the upper surface facing up-the stabilizer cutout in the backbone should also facing UP. On Diagram C the wing and the backbone are depicted in inverted position."
The build thread here shows the notch facing DOWN.
You are correct that it shows it that way in the manual. I don't remember if I had a manual or chose to disregard it.
I think you can go either way and it wont make a big difference but it is up to you.