john_tullamarine, ok i think i got your point. I indeed shouldn't have used the term balanced field. I thought about optimizing V1/Vr & V2/Vs for different Flap settings and as consequence possible usage of the full TODA with lower flap settings. I have associated it with BFL because the MAX TOW would be achieved with optimum Flap setting, optimum Speeds using the full length, rather then using higher flap setting and not the full length, if the take off is obstacle limited.
I hope i have regained some of your credit.
Cheers.
