just to further muddy the waters ...
In high surface winds with windshear likely on departure, we are allowed to add up to 15 kts to the Vr. Now lets assume that the runway is not limiting, as is often the case on my type, we have a weight book V1/Vr now with a spead of 15kts. Arguably with no FLL the V1 could sit happily under the new Vr, and the takeoff abandoned without compromising safety at that new V1. Problem is that at MTOW, there is no way to reverse calculate an "assumed weight" for the new V1 to check the FLL... probably to stop people scheduling an overweight takeoff with all the liability issues that would go with that.
This is a scenario I can envisage where I see an obvious conflict.
V1 .... long pause ... loud bang at V1+10kts with 2500m of runway ahead, thats almost twice our LDR, the temptation may well be to stop provided no rotation has been initiated.
Last edited by Teddy Robinson; 19th Aug 2011 at 13:05.
Reason: typo.