737-800 reduce thrust take-off???

[repulo]

F D,

I think you are almost right, it´s exactly the other way around.

Let´s assume you derate from 27k to 24k, then the Vmcg wil be calculated for 24k. So your green bugs will show the max thrust rating, in that case 24k. Increasing thrust is therefor only allowed till you reach the bugs, where you should be anyhow, since no Ass Temp on slippery RWY. You could apply more power, but that might spoil your day if Vmcg limited.

Makes only sense if not RWY limited, e.g. short sector, light aircraft, slippery RWY. Then you rather have a directional control problem (increases with rating selected) since there is a great V1 Vr split. Using less power makes keeping the CL easier, still giving plenty of acceleration.

On a short slippery RWY with heavy weight, that is no option, either use full power, or stay and wait.

Let me know if you see it differently

Regards

Repulo