Originally Posted by TomConard
So, the crux of your question is: So, we reduce V1 because of the tailwind...but why not keep Vr as it was?
That's it exactly mate. I fully accept the charts are right (particularly at places like AGP) and I was just trying to get my head round the unrestricted airfields. V1s have a massive range min-to-max, and on those long runways you can pretty much decide what you want (so long as it's above Vmcg). The Vr's I'm talking about are still way below max tyre speeds (they are perfectly okay with the 0 winds). As I said, I presume that they do it as a standard thing with tailwinds, regardless of where you are as even on the hugely long runways with no segment restrictions, it's still there.
Having said all this, it's never been an issue on the line particularly - just exploring the principles behind it.
I really appreciate you taking the time.