PPRuNe Forums - Calculating crossing time

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Razor

24th June 2003 07:37

Calculating crossing time

Has anyone got a quick method for working out crossing time of opposite direction traffic based on estimates?
I heard of a method using the wizzwheel once but can't remember it...:confused:

Intruder

24th June 2003 11:18

Using Mach, your Mach number in tenths approx = miles/minute: Mach 0.75 = 7.5 NM/min.

Two head-on aircraft at .75 - .80 will be closing at 15-16 NM/min. With an average detection range of 7 NM, you have 30 seconds or so after visual acquisition. With a nominal 20 NM TCAS display range, you have 1:15 - 1:20 after first display.

OzExpat

24th June 2003 16:07

Hey there Razor... does this question mean that they're finally gunna give you yer own aeroplane? :ok:

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