Thanks Matt: Well said. It is too easy to forget where one came from after a couple years of experience. When I started tying flies for trout fishing a couple years ago, I I wanted to tie classic salmon flies, but couldn't tie a simple grub. So too, when teaching Aerospace to my students, despite studying mathematics for many years, it is all too easy to assume that one knows the basics of integration. They want to start analysing things to death, without getting through the basics. Just have to bring them down and show them what it means to get it done. How far would my students get, despite being on the brighter side of things, if all I did was call them fools for thinking they couls analyse the aerodynamics of a simple control surface?? Even the brightests and most determined would suffer.

R