Nope, nothing has changed. The funny thing about this thread is that everybody is arguing the wrong point from the one Whifferdill and I were discussing. Seriously, we were just talking about a detail in presentation that one can not follow as presented. It is just a poor example of a way to present a concept, not the concept itself. It wasn't until people started trying to argue the wrong issues incorrectly that things got stupid. Seriously, it was a critique of instruction, not aerodynamics.