An interesting feature of "Stick and Rudder" is that it is in large part a critique of the(then) conventional taildragger configuration and an advocacy of tricycle gear (a bit contrary to current fashion, perhaps). Langewische was also quite keen on the linked aileron/rudder thing as tried in the Ercoupe and some early Piper trikes, and which I gather was not thought a success. I think that the best things about the book are its observations on turns, approaches and general handling. I found it a very thought provoking reference throughout my PPL and still dip into it from time to time.