This is a nice set of lectures. I looked through the notes on aerodynamics and they are better than most sources, however I do have an issue with two items there. When talking about the minimal drag every book (for pilots that is) mentions that it occurs where the induced drag and the parasitic drag are the same (they even have a graph to reinforce that) while some simple calculus shows that it is rather the point where the two grow/decrease at the same rate and I have seen no reason to believe these are the same point (most aerodynamics books just state that such a point exists).

The discussion of the left turning tendency, while technically thorough and correct fails to mention the relative contributions of the various sources. Again, any introductory aerodynamics test has a 'back of an envelope' calculation that shows that for the majority of GA aircraft 95 percent or more (in terms of force) of left turning tendency is due to the spiralling slipstream. Precession and torque are only significant for very large radial engines (and helicopters, of course) and the asymmetry of lift is responsible for barely 1-2 percent (this is why during landing the plane still tends to turn left even though the asymmetry of lift would suggest otherwise).

They formulas for lift calculation were a nice touch. I wish they would also mention the Coanda effect.

Edit: of course most of this is totally unnecessary for a pilot to know. Even though it helps to understand the spiralling slipstream if one is flying a high-tail plane.