I picked up a used 'china rip off' all carbon surf foil (based on the lift foil template) just for pure curiosity to play around on a prone board-have sup foiling down. The rear wing fits seamlessly facing down but I had always assumed the rear wing goes up - which I did manage to fit it facing up with some new screws...although not quite as neat alignment.

80% of the pics I looked at online has the front wing down/rear wing up BUT there was a couple with the rear wing down.

Any thoughts?