Mad flt:
I agree with you. Longer takeoff roll in footage/meters (whichever one you use) - but same point in percentage.
I'm thinking that if a given runway can support a given weight, we'll call that 100% then devide that pie to a blue (run section) and a red (stop section).
Let's assume (just making up numbers here) it's 75% blue and 25% red. I'm asking whether that airplane no matter what thrust setting chosen will achieve Vlof at 75% each time.
At full rated thrust because of the point at which we reach the "true" Vr and subsequently Vlof. And at a FLEX thrust at the "synthetic" Vr and subsequently synthetic Vlof.
Hope that helps clearing my question.