Some questions for S.F.L.Y.:
1. Do you hold any sort of pilot's licence/license and if so what is your level of experience? For instance, have you flown large aircraft into Schiphol?
2. What do you mean by the term "Vz" which you use repeatedly? Vx and Vy I am vaguely familiar with but my aeronautical knowledge does not extend beyond those to Vz, hence my question. Perhaps it is something that has come into use while I was distracted renovating my shed so please enlighten me and your other many readers here.