Question from a non-pro
May I ask a question? I am not a professional pilot. I have noticed as a passenger that when you perform a "rolling take-off", you start to spool up the engines before being fully aligned with the runway. I understand that the engines are spooled to a certain percentage to check that they are spooling up stably, and only after that point is take-off power set. Now my question is: do you apply take-off power only once the aircraft is fully aligned, or is it acceptable to apply take-off power while you are still in the very final stages of lining up the aircraft. Hope that's clear. Thanks, Nick