Defacto
With engine failure at v1 and a minimum accelaration height of 900 ft you need x distance
If you t/o with 2 engines your climb performance is more than 50% better (basic 1engine vs 2 engines theory) so you will be at 800 ft in in less than x distance
Considering your climb performance, your aircraft's inertia and the reaction time ( thrust set from t/o to clb) you will be at 900 ft in a shorter distance than X(so b4 your obstacles) even if your engine fails. Now if during your thrust reduction you experience an engine failure YES you should re apply to thrust(to be able to accelerate ) and level off at 900 ft (you will actually be well above) I say again this is not the theory.This is my own opinion for your example 800 vs 900 ft and this in not applicable to all cases !!!
Last edited by pilot-737; 6th Mar 2013 at 15:02.