Many of the early aircraft designs featured the under camber sections. In models, it was more popular with free flight designs from the 30's and 40's, and still seen today in old timers flow with radio. The MEN Trainer also used a similar section in a rudder, elevator and motor control design.

The MEN Trainer would also fly around inverted for as long as you wanted, with just the rudder and elevator controlling the model. Dihedral make no difference as to whether or not you can fly a model inverted. Airfoils of any design will fly inverted if you have enough angle of attack and enough power to overcome the drag inherent with creating lift....the same as when they are right side up.