At first, remember that v1 the speed, where take-off has to be resumed/rejected in case of an engine-failure, therefore "V1" and coming after it "Continue".
So, the heavier you are,, the more the brakes have to take care of, therefore: more weight, Less V1, because more mass needs more breaking distance.
Hope it's clear? Correct me, I'm a Student and absolutely not free of mistakes ;-)
Last edited by Gremlin1991; 3rd Mar 2013 at 11:18.