Hello guys
Just to square this out from the start: Yes, I've read earlier posts, and yes, I've read the FCOM. I'm still puzzled.
I know that a fixed derate gives you a lower engine rating, resulting in lower Vmcg and Vmca, and therefor a lower V1. So far so good.
I don't understand how a lower V1 can give you more payload on any given takeoff.
Thanks
