Stick & Rudder is so good precisely because it doesn't resort to formulae to explain how an aeroplane flies, and why it some times doesn't.
If you want to know how to design aeroplanes, it won't help you much.
If you want to know how to fly one - it's the bible.
If you read and understand S&R, you understand flight. Not many PPLs do. It should be required reading for every PPL, but is irrelevant to any college of aeronautics.
SSD