After the students checked out the lightweight whirlybird, Hall followed them back to school where the theory behind the practical application they just observed would be examined.
Jones said the plan was to have a lesson on aerodynamics that day with a special emphasis on helicopter physics.
I wish they get more explicit in what exactly the principles they are being introduced or being demonstrated using the helicopter. "Lesson on aerodynamics" is rather vague. Besides, and someone can correct me here, what exactly is the lesson from aerodynamics as far as a helicopter is concerned? I would think that it is more to do with straightforward classical mechanics of angular momentum, Newton's 3rd Law, etc. It would have been a lot more jaw-dropping if, while in flight, the tail propeller falls off and the students could see the helicopter spinning out of control - conservation of angular momentum in action! But then again, that could end up in an utter disaster (that's why I called it "jaw-dropping" demonstration).