Originally Posted by despegue
If your performance calculations for your flex take-off have a very low V1, then sometimes, that V1 is lower than Vmcg for Full thrust T/O. This depends on how your performance is calculated, and can be an issue if your airline uses min V1 as standard for flex. take-offs or when RWY WET.
Our company's laptops always calculate the speeds with Vmcg for max thrust as a minimum V1 speed.
Originally Posted by de facto
Maybe safe but WRONG,why the rush?
Starting up those laptops, inserting the new data, do the calculation and insert them into the FMGS will take 3 or 4 minutes at least. Sometimes you have the time and sometimes you don't. I will not delay my TO (and delay traffic taxiing behind me) just to do unnecessary TO speed recalculation. Now if you're talking about delaying the TO due to the weather, of course that can be considered if it looks unsafe to take off.