Ariel rudders, are they faired to a chord from keel to trailing edge?
OR is the rudder totally flat on its two sides?

I'm inclined to make the surfaces very slightly convex - because it looks right.
But is there a case for the rudder as an extension of the keel diminishing in flat sides to a razor's edge?

They talk about modern stand alone rudders as having lift, because of their curved sides, but I don't understand how lift can happen if there are symetrical curves on both sides. Seems like turbulence would be a problem whatever the chord of the blade.

Modern rudder blades seem also to go from a rounded front to a squared off trailing edge. IE, two trailing edges. Whatzat fer?

Question is: what is the ideal shape (plan view) for an Ariel rudder?

Another kind of 'fairing'....

Question #2: Has anybody faired (or contemplated fairing) the keel to the rudder to eliminate the supposed turbulence made by the round rudder behind the squared-off keel? I think fabric has been used, tempered bronze strips, what else? Would it help to win a race.....?