Climb gradient.

[cape]

At what point does the climb gradient begin.vlof,screen height or some other point along the takeoff path.Cape.

 

[zasca]

probably 35 feet above the threshold at the departure end.

 

[75 Driver]

All the Climb Gradient info you will ever need

http://www.captainpilot.com/files/B737/Climb.pdf


Long presentation, but well worth looking at. Skip the math and get right to the meat of the presentation, then go back and look at the math if you are interested in the "theory verification"