Nothing normal about Normals...

Hi All,

I've been through plenty of threads covering this but i'm just not getting it. I've spent the last two days trying to make the normal's of the flanges of my panels go in opposite directions to each other to facilitate analysis in ansys. 

My thought was that I'd create a line extending out from the center of the flange and if it intersected with a panel then the panel it extended from needed to be flipped. Unfortunately i'll be buggered if i could get it to work. I seem to be struggling with managing the data, at first the only intersection point I was getting was the start point of the curve on from the face it was created, so then i thought I need to flatten one of the streams so that each surface is looking for an intersection with each curve but that doesn't seem to have worked either. 

Any help massively appreciated as i'm really at the end of my tether.

Thanks

Rob