yw karsten. i'm concerned I created an issue with certain chord distribution options. the sweep should really be defined at the aerodynamic center for all chord distribution options. I was surprised to see that wasn't the case on the a400m. I suspect options 3-5 are messed up. I'm not entirely sure how to fix that right now. hopefully this won't mess you up too much. if I have to make a code change then I also have to make new input files etc... so the example geometry may change slightly. I have to figure out what's going wrong first. seems like I fixed some things only to break others. i'm really glad you brought this to my attention. for now stick to options 1 and 2 and you should be fine to use the total sweep angles output by the code.