I am now getting kick back from our some of our most senior captains against the use of flaps 1+F takeoff.
The latest is in the high OAT we operate in; ME, the increase in V1 speed which is even greater with flaps 1 and the light weight we operate at are too high???
From what I know is V1 is limited by Max brake energy speed, the brake energy speed is dependent on weight and thrust. Even some say that the small saving in fuel do not outweigh the use of flaps 2; try telling that to our CFO. Although I have yet to hear a technical performance reason to not be using and optimizing our performance when ever possible.