The problem is you can't pass my version of VLiftCoeff directly into CreateAirfoil. You need to use one of the two "wrappers" I made, like this:
CreateAirfoil(LIFT_VERTICAL, _V(0, -0.01, -0.1), VLiftCoeffAoA0, 5.5, 0, 1.27);
// or
CreateAirfoil(LIFT_VERTICAL, _V(0, -0.01, -0.1)...