fzero funcion (stahlhut file) failure at low collective pitch angles
The code fails when a low enough pitch angle is introduced in the template file. The code gives the following error message:
**Error using fzero Function values at the interval endpoints must differ in sign.
Error in stahlhut (line 86) [phi, ~] = fzero(Gfunc, unk0);**
It is considered that this is caused because a negative inflow angle is achieved in some sections of the airfoil.