May I submit a modest proposal, watch FF during a few take-offs and note it. It will give you a ballpark (your choice of ball
) idea of what FF to look for. Then, make it a habit to check FF as power is set to the approximate take-off setting. FF will increase quickly and should be at the right flow before the engine has reached EPR or N1. I used it all the time on GE CF6s, worked well.
GF