OS
I agree, it is amazing how many pilots who are very unversed in the fundamentals of performance. In the US, my experience base, is that the regulators have dumbed down the tests for ATPL, so the schools have only taught the dumbed down test and finally, performance is taught in the afternoon after a heavy pasta lunch.
In any case, this is a rather basic problem, but I'll bet a large percentage of line F/Os don't understand it. The basic physics are not difficult, just a lack of thorough explanation. Anyone, for a link to ALL the Pprune discussions on this subject?
No bad aspersions on the OP, btw.
GF