Originally Posted by Will Fraser
Elevator needs no 'airfoil', it's work is done by deflecting airflow, as a trim tab would, and 'lift' isn't part of the purpose.
Not always true Will...
Tailplanes very often have non-symmetrical (cambered) sections. Frequently they have negative cambered foils, as they are optimised for nominal downward trimming loads (c.g ahead of a.c) for stability.
The elevator would be a continuation of this section, containing a modicum of the camberline.
These are supercritical sections, and their aerofoil section also influenced at the root by local flow (note the main wing's section on modern airliner's has a camberline that also looks negative - at the root, due to wing-body interaction)
So whilst I've been out of this business for some years, I'd still bet that tail section is unlikely to be symmetrical. It wouldn't though, at the mid to tip sections, be heavily cambered (negative or positive).
Rgds,
HM