Thank you all for such nice feedback. Anyone who has mentioned AeroCasts spoke about it in very positive terms. I just realised the next episode about mass and balance. There is no math at this point, it's just conceptual approach on the topic it will come in my next épisode. Here it is:
Episode #7, Mass & Balance Conceptual Introduction
#7 Mass & Balance Conceptual Introduction - AeroCasts
Enjoy, Olivier