Extremely well-written, readable. Here, you can learn about airfoil (hydrofoil) theory in detail, all the way through induction effects (drag and change of angle of inflow). I read it to understand outboard racing propellers. There's is no tractable theory of the latter because of asymmetry, and because racing propellers are surfacing propellers. So you learn what you can from airfoil theory and the rest is engineering via the seat of the pants, try something and then test it to see how it works. I did that for 9 years and set 3 APBA OPC speed records along with winning 6 National Championships, so the method worked pretty well in practice for me but left the most interesting questions about what propellers are doing unanswered.