Rudder deflection doesn't always work

[Bill-B]

Model the following panel (vertical stab with rudder def. 45deg) and run with phi = 45.0, circling,horizontal flight, alpha 10.

Panel #: 1. Number of elements across span n = 2 and chord m = 4
Neighbouring panels (0 for none) left: 0 right: 0
xleft yleft zleft chord epsilon Bound.Cond. Airfoil Hinge Deflection
5.500 0.000 0.000 0.350 0.000 100 2 0.700000 45
xright yright zright chord epsilon Bound.Cond. Airfoil Hinge Deflection
5.500 0.000 2.500 0.350 0.000 100 2 0.700000 45

The rudder deflects in the plane of the vstab, not out of the plane.
Maybe an issue here with quadrants:

FreeWake/Source/wing_geometry.cpp

Lines 610 to 622 in fd3e186

	ceps = cos(surfacePtr[l].epsilon); //needed for tempA below
	seps = sin(surfacePtr[l].epsilon);
	//computing the mid-span location of the DVE LE
	//temporarily saved in xleft
	tempA[0] = x1[0]+xLE[0]*tempS;
	tempA[1] = x1[1]+xLE[1]*tempS;
	tempA[2] = x1[2]+xLE[2]*tempS;
	//vector from LE mid-span point to reference point
	delX[0] = surfacePtr[l].xsi * ceps;
	delX[1] = surfacePtr[l].xsi * seps * sin(nu2);
	delX[2] = -surfacePtr[l].xsi * seps * cos(nu2);

[Bill-B]

probably fixed in 27794d6. Problem was the sin of a dihedral >90deg. Also, always define vertical stabs from bottom to top.