hi karsten,

I got the bug fixed. you can now use the angle of attack and total sweep angle files at the aerodynamic center, as was always intended. I checked them out using the a400m model you asked about. there is an updated version of prop design on my website. download that. all the input files were updated as well. so re-run the a400m example. I posted the file I talk about in the screencasts. the links to the updated answer to your question are here:

rhino 5 3dm file for the a400m example; edit - this file was replaced with a more detailed version. the link is in a later post.

screencast part 1; https://youtu.be/lJ7FFXkQr9c

screencast part 2; https://youtu.be/mQMdhpCeoZA

screencast part 3; https://youtu.be/Ns2GiYCnL80

I deleted all the old files and screencasts that I posted in previous forum messages. let me know if you have any more questions.