Hello Peter, nice to greet you.
I have proceeded to gradually translate your book of flying wings into Spanish. I could have translated the "pdf" through one of the programs that do it, but I preferred to do it piece by piece by adding notes attached to the document, thereby "studying" and trying to understand everything in said book. you explain. At the same time, I was correcting some words whose translation into aeronautical terms was not correct. In any case, I am not an engineer nor do I speak English, so I cannot rule out some errors.
Since you are the author of the book (along with the other collaborators, Uwe, etc.), if you deem it appropriate, I will send you the document in case you want to attach it to your download page to make the work easier for Spanish speakers, I in no case I am going to provide this translation for a minimum of protection of the intellectual property of the authors.
Best regards and happy flights.