A symmetrical aerofoil at zero AoA creates no lift, but it does create drag.
Explain how this drag is generated. Please keep it in relation to Bernoulli's theorem.
I'll stab a guess.
The symmetrical at zero AoA will not generate
induced drag but it will suffer the penalty of
parasite drag. Parasite drag is the product of the skin friction coefficient, the surface area and the effect of
pressure drag and airspeed.
My best guess is that Bernoulli's theory might have something to do with the pressure drag?