I looked at some numbers today and would like explenation if possible
please.
In the performance A320 book I picked a sea level runway with zero slope,
3800 meters length and checked the Take off speeds
115/ 119/ 122 Are the V1,VR, V2 flex 68 for 54000 kg take off weight.
149/ 149/ 152 flex 68 are the speeds for 63000 kg take off weight.
Now If I abort at 116 V1 for the 54000 kg weight, the plane will over
run the runway? but if I abort at 148 speed and weight 63000 kgs
The plane will stop before the end of the runway, although I would have
used more runway in the second case as the flex is the same.
This really does not make sense, as I had less speed, less weight
and more runway for the 54000 kg take off.
Any explanation please.