Originally Posted by
hhassan
Ok Tailwind will reduce V1 for ASDR understood, but why would a headwind increase V1 , dont get it ?
Think about this.
I can stop from 100kts groundspeed in 500meters.
Zero wind 100kts GS =100 KIAS
50 head 100GS = 150KIAS
Same stopping distance.
The higher V1 gives a higher potential RW limited TOW, by moving the crossover point where Vstop = Vgo. Just like upslope would do. And the opposite to downslope or degraded braking (wet or ice).
Here is a simplified idea of optimised V1 and headwind moves the stop line to the right.
