Great thread this, thanks @silas this was very interesting, and interesting that they start with the result and then work backwards.
With an additional one being to avoid major low pressure peaks on the upper side of the foil as this will make it have bad ventilation characteristics.
This is not forward to back but transverse loading?
Fwiw for the rest of us, this article explained things in terms that I could just about follow, (this clip helped make sense of the plots - note the reverse y axis on the screenshots. They are worth understanding if you’ve got this far!)
Imagining that the HA combines these in some clever way, something like below, but then I presume you start encountering the “True reflex entails a very aggressive pressure recovery that can cause quite some stall issues”
