737 clean speed is at Vref40 + 70, so perhaps V2 + 40 give or take?
Yipoyan - wouldn't you also have to consider the wing incidence to the fuselage before you can use that method? I'm running on the assumption it's non zero for a 747 else it would eat up a hell of a lot more runway at 400t than it does no?
Last edited by Port Strobe; 3rd Nov 2008 at 14:44.