Bonjour Jim
  R‚ponse … un message du  12 Jun 97,
                ‚crit par  Jim Cole
                      …    Philippe Vessaire
 PV>> V1 speed may be choose between V1 mini and V1 maxi; and each
 PV>> airline choose high or low V1 for an airplane type. And, on a
 PV>> runway, if you can stop a 165 tons plane at V1=155 Kts, you can
 PV>> stop the same plane at 125 tons and 145 Kts, even the computed V1
 PV>> is 140Kts
 JC> I'm not sure I fully understand your point but will try to clarify.
 JC> The definition of V1 is a "Speed to which you can accelerate with both
 JC>  engines operating to critical engine failure speed and experience an
 JC> engine failure and either continue the takeoff or stop in the
 JC> remaining distance".
it's that.
And, with actuals rules, we must have one V1.
But for a plane, a weight, a runway and day conditions we have a lot of 
peeds
witch agree with the law, and we must choose only one speed.
And if you are below the runway weight limit, the higher V1 may be greater 
than
the company choose. We can't know exactly it's value, but we know higher 
weight
V1 value. And I wrote that : if you can stop a 165 tons plane at v1=155Kts, 
you
can stop the same plane, at 125 tons at 145Kts, even the choosen V1 is 140 
Kts.
Because we must choose a V1 among a lot of V1 that agree the legal 
requirement.
Salutations,
                   Philippe
... Naturiste: corps sage sans corsage.
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