Where does this saying come from and what does it have to do with an envelope? What does it mean too? Thank you. I hear it alot on news shows, etc. Shows with intelectual discussions.
shane said:Taken from [url]http://phrases.shu.ac.uk [/url] :
Go to the limits of known performance.
Originated with aeroplane industry where the limits of a plane's performance were marked on a two-dimensional graph. The envelope is the area of the graph that indicates safe usage. In use since the late 1970s.