Quick Cross wind
The part of an hour…
Any thing over 60 deg off the runway: cross wind is the full wind…(a full hour)
45 deg off is ¾ hour: cross wind is ¾ the full wind.
30 deg off is ½ hour: cross wind is ½ the full wind.
20 deg off is 1/3 hour: cross wind is… well i think you get the picture… but still: 1/3 of the full wind.
nornally accurate to within 2 kts…
