I'm not much of an academic and I don't have much over 20,000 hrs, but I do have some experience calculating slippery runway V1. First you figure your normal V1. Then figure it for your runway limit weight which (assuming that you are below your runway limit weight) will yield a larger number. Then go into the charts based on the difference between actual weight and runway limit weight to get an unbalanced field adjustment which you apply to your runway limit weight V1. There are a couple of more steps which aren't difficult when you have the charts, but are hard to explain. When you get to the end you have a range of several knots from which to chose your V1 any one of which will allow you to stop or go on that day on that runway. Where I worked last it was a crew decision whether to use it and what number to use.
Last edited by Rick777; 25th January 2009 at 17:01.