Sorry chaps
Don't know what came over me. I was worried I was coming across as a bit thick
The V1 part of it I get (tailwind is a bit like any other contaminant). What I am struggling with is the reduction of Vr..... unless anybody else can add fuel to the fire?
Tom
Your answers were great and I really appreciate you taking the time to help me get my head round it all (if I'm honest, I still haven't totally - brainache!). But good work fella
mutt
Now that just really confuses me! Just as I was starting to get some sort of grip on it
But at least it's not just me then!