I posted my original query hoping to learn where the phrase came from. When responses arrived that were not what I was looking for, I elaborated the query to prevent others from wasting their time. This is clearly what the "edit original post" is designed for. As an expert in helicopter aeronautics, I know quite a lot about NOE flight. What I don't know and wished to learn is the origin of the phrase. I was hoping participants in this forum would help. I'd still appreciate any useful responses.