ATPL Meteorology - Class 11: Wind I.
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- เผยแพร่เมื่อ 19 ก.ย. 2024
- ATPL Meteorology - Class 11: Wind I.
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Welcome to the 11th class in the Meteorology series.
Wind makes for some fun while landing. In this class we look at how wind is generated and some important concepts that are relevant for aviation.
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Aiming to assist with ATPL theory exams and the ground school aspect of ATPL training. Including helpful tips for studying and to use in the exam.
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Isn't the wind that blows from equator to the south also veered to the east?
You are right my diagram isn't correct my S shaped line would show wind completely in the northern hemisphere. It's not always to the east though it is more that it is pulled round to the right or left.
I think Gradient wind is more easy to understand if you consider centrifugal force instead of centripetal. The centrifugal force acts away from the centre of the pressure system. In the case of a high pressure system, it adds up to the PGF and in the case of a low pressure system it subtracts to the PGF. Adds --> Super geostrophic, Subtracts --> Sub geostrophic. It makes sense because the PGF must be equal to the Coriolis force / Geostrophic force.
are you sure its Geostrophic force and not wind??? the formula you wrote is for Coriolis force its confusing for the beginners
Great videos. Question: isnt the Centrifugal force acts away from the centre. on the diagram drawn will it be to the left from the high pressure adding to the PGF ?
Even I had the same query, but on watching it again, he explained it in terms of Centripetal force, so it is correct, and makes sense.
Good question Yaz, it is as Vatsal is saying. This diagram explaining the gradient wind is in in terms of Centripetal force not Centrifugal force. The Centripetal force is the force that pulls the wind around the corner so it is acting with the PGF around a low. Around a high it acts with the Geostrophic/Coriolis force.
@@atplclass Actually what is misleading in the chart is the "CF" for Coriolis Force and not Centripetal or Centrifugal Force.
@@atplclass The correct answer is Ce Centrfugal force always causes force away from the center of a bend at a radius to the central pivot point. Corolorious force is always ninety degrees to the right of the wind direction. The forces that change direction are the CE dependent on the curvature of the flow, to the outside of the bend, friction if you are in the boundary layer, and almost no friction above the boundary layer.
Great explanation - thank you🥳 very helpful
You’re welcome 😊
Hey Grant, thank you for your videos that trying to break hard things to easy.
I've noticed something: at 11:44 it is written that as we descent in the friction layer, over land and at night, wind back 45° and its strength is reduced by 35%.
At 13:45, in the summary section, it is written 45° and 25%.
Which data is the correct one?
Thank you in advance.
QC.
you say cenripetal force but you write it down as CF which is cetrifugal force why is that and in the book it mentions centrifugal im a bit confused
4:20 three lines are drown one which was coming from equator and curved and then one again PGF which is going straight up to that 90 degree you drew the GF so if PGF is again going straight up then what is the curved line?
the curved line is the wind direction
Hi, for the land at night you mention the strength to be both 25% and 35% of its original value within the friction layer. Could I ask which one is it please? It changes in the summary. Thank you.
UP
Hi, when can you do performance?
Performance or Rnav will be the next series
Thank you!
You're welcome!
Please could you do RNav ?
Up
The next series will be either Rnav or Performance
is it possible to scan the pappers and attach them as pdf please
No, to put it simply, I don't have a scanner. It's better to write your own notes anyway tbh. That way you can edit and correct anything that I say that doesn't make sense to you.
Hey Grant are you a pilot?
I am