hi karsten,

so I made some errors creating the last two airfoils in the model I sent you for the a400m blade. I have it oriented much better now. the angle of attacks match. there isn't that odd angle showing up. however, the sweep isn't matching up exactly. so I still have to look into it a little more. I found you can use the 2 rail sweep going to a point with multiple cross sections. to smooth it out I skipped a few of the cross sections around the kink. the solid looks a lot like the one I usually get using just the first cross section. I also curve fit the rails to work out the kink, as mentioned in the video. so it's much better now. there may not be an issue with prop design. but i'm still not sure. I am seeing a much smaller difference. at least it's not a huge difference like I was getting.