Originally Posted by
Tarq57
So how do you guys estimate the time from the rotation of the heavier aircraft to the time of rotation of the lighter?
Or do you just count the full two or three (or whatever) minutes from the rotate?
Yes. Count from rotate time of the first, then using professional judgement, issue a takeoff clearance to the following such that its rotate time will meet the standard.
Rotate time is so close to airborne time that it can be done from logging airborne times.