More on this from AWSI.
Kane does a great job explaining the design tradeoffs. Interestingly, to get the most out of the top end, you need a symmetrical leading edge, which sacrifices the low end. The aft camber compensates for that. So it might be that the symmetry on the leading edge is the innovation, and the aft camber is to compensate…
Compare the Fireball, with regular camber. Adrian explains camber. So while Adrian seems right in his explanation of camber, I’m more convinced of Kanes design
Fwiw, very hard to find much about aft camber online.
I found drawing it to help it click, the right version without the foil shows the camber and chord lines
