Originally Posted by
Nil by mouth
From my local Rag:-
The landing EI-DYR aircraft touched down on the runway with a ground speed of 141 kt. For its part, the EI-ENH aircraft was on its take-off run executing the rotation manoeuvre, with a ground speed of 157 kt. The distance between the two aircraft was 520 m (0.28 NM). This was the point of minimum separation between the two aircraft.
That just doesn't compute. The minimum separation in this scenario would have been at the moment at which both aircraft had the same speed.
At the different speeds quoted, the landing aircraft was doing 141 kt and the departing aircraft ahead was doing 157 kt - quite some difference of 16 kt of increasing separation. Therefore the moment of minimum separation must have occurred before this. With the departing aircraft accelerating away, probably their speeds were equal some 4 or 5 seconds earlier, at which moment their separation would have been significantly smaller.
With such a glaring error, it is difficult to believe any other of the 'facts' and figures given.