Pardon me for going so far back
And flat bottomed airfoils do not have a built in angle of attack. Folks just draw them that way
What I was meaning was that they are not at an angle in relation to the ground, but rather, that a flat bottom airfoil acts as a symmetrical one with a positive AOA
Or so my dad says....
And thanks for all the math
Keeps me from forgetting it over the weekend
