Horizontal Stab ribs

[geraldmorrissey]

Can anyone tell me if rib 5, most outbd stab rib and 6 elevator rib are airfoil shape or flat on the uppr and lwr surfaces? Seems like 6 would be flat for the counterbalance ear and 5 would have to be flat to match it. Maybe I just answered my own question.
Gerry
Patrol #30