legal requirements for the TO case mandate that a NTOFP...that clears all obstacles vertically by at least 35' and 200' horizontally within the airport boundaries...and 300' horizontally after passing the boundaries....The NTOFP is the actual flight path reduced by 0.8, 0.9,an 1.0...for twins, trijets and quads, respectively until a height of 1500' above the airport elevation,...after that it is a performance engineer's* art...
this thread needs a little Krupa
* J_T, O_S and Mutt