Why are we speculating on whether or not this crew rejected past V1 when there's not even a preliminary report out yet?
Quote:
Originally Posted by WacoFan 
I always thought V1 was the speed at which you were committed to flying if an engine failed, due to the inability to stop on the remaining runway if you aborted at that speed or higher.
|
Sometimes, but not always. If V1 and Vr happen to be different numbers, then that's a good clue it's impossible to stop after V1.
V1 could be selected from a range of values depending on whether you (or your company) "go" oriented or "stop" oriented. In the military, we calculate a speed that is greater than or equal to Vmcg and CEFS but less than or equal to Vrotate, Vrefusal, and VBmax. Critical Engine Failure Speed (CEFS) is basically the speed at which it will take the same amount of runway to go as it would to stop (Critical Field Length). Anyone know the civilian equivalent of that speed? Vrefusal is another number we compute that does actually represent the speed you
could accelerate to and then stop on the remaining concrete. On long, dry runways this speed is usually higher than V1 because you'd be flying by then anyway. However, on short wet runways this speed will be controlling and you had better abort prior to then or you're not stopping on the runway.
With all that said, there's a reason we have a V1; pass it and you're going flying.