PPRuNe Forums - View Single Post - Call V1 3 to 5kts prior
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Old 8th June 2008 | 07:23
  #97 (permalink)  
FlightDirector7
 
Joined: Jun 2008
Posts: 29
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From: india
Hi PEI 3721,

I agree with all your comments. When i had mentioned the V1 speeds "be it wet or dry" in my last post i had known that they would be much lower in the case of wet for all the reasons you had mentioned and more ofcourse. As a matter of fact, on the A319/320/321, i have seen V1 speeds up to 12 knots lower than that of a dry runway at certain airfields. My question was simply to ascertain whether V1 on RTOW charts are so critical that they don't factor in reaction time even if you reject slightly above V1. Lets take a case where there is no split between the V1 and Vr, yes rejecting now is pointless as you might as well get airborne. But if you have a split of say 8-9 knots between V1 and Vr, due to climb gradient performance, its a more serious matter accelerating to Vr after having lost an engine. Leaving aside the legal implications of rejecting slightly above V1, my question was does that speed leave an margin for you being a conservative speed, or is it a GO speed ?
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