once you add this additional weight you are back at the same gradient, so from your point of view there isn't an improvement in the gradient, just an increase in the weight
oh really ?
unless you forget the extra runway to achieve the higher airspeed.
So even if you have the same gradient it will start later,
so Sent is right that
that extra speed would get you closer to the theoretical critical obstacle
You would be right if you accept "balancing" the extra runway length
(lower TO flap ) for extra speed (improved climb with lower flap),
that gives you HIGHER GRADIENT, not the SAME,
to be able to fly above Sent obstacle at the same hight.
