Why cant we get things sorted, enroute acceptance etc, to be able to punch off waaaay closer spaced departures like other major aeroports? Ie LHR and DXB.
LHR has a splay at 2nm, so ac can go left, center or right at the splay. At MEL, the op for a splay is much further out if I remember...and splay L,C,R, really isnt a valid option.
A few years back, we sat in the tower and looked at DEP from RW 27. This included timing from clearance to roll, time to rotation, and rotation point.The exercise was to determine how much time it would take from clearance to roll, issues with spool up times, and especially the rotation point as it related to the crossing. The theory was to say that DEP wake from RW27, had no effect on RW 16/34, as the ac rotate after the crossing. This was not the case.
Back to the timing, it was very interesting to see how much time some ac took from clearance to roll.