whether you're learning to fly or you're an experienced airline pilot cross when
landings are a part of our daily job in this video I'm going to show you the
mental math that I use when calculating my cross wind component coming up 963
heavy sliding one Niner zero maintain one zero 10,000 for only 180 left clear
for takeoff hey crew what's going on if you're new
to the channel my name is Chelsea I'm a 747 pilot in this video I'm gonna go
over the mental math that I use when I calculate my cross wind component let's
get into it I'd like to do the math so let me just disclose this what I want to
tell you is that I did not invent these techniques there are either things that
I've learned with guys that are flying with or I've read or studied somewhere I
don't know where I learned this specific technique what we're gonna talk about
here is the mental math and how I use this on a daily basis and I'm just going
to give you a few scenarios here so the very first thing you need to do is
establish the difference between the runway you're landing on and the wind
and the direction that it's coming from so I just take the bigger number and
subtract the smaller number just to make my life easy so in this first scenario
you're laying in runway 9 the wind is 0 4 0 9 minus 4 50 so your difference
between your wind and your runway is 50 degrees pretty simple right second
scenario you're landing runway 1 8 the wind is to 5 0 at 15 knots 25-18 7 so
your difference is 70 degrees 70 degrees from the from where you're landing to
where the direction of the wind is you're landing runway 3 6 windows to 7 0
at 20 knots so your difference between 3 6 and 2/7 is 90 degrees so you have a 90
degrees difference so that's the first thing you need to establish when you're
calculating your cross wind component what is the difference between the
runway you're landing on and direction of the wind so I like to keep things
really simple so here's what we're gonna do we're gonna move the decimal point
back or drop the zero in the case of the direction of the wind right now we got a
difference of 50 degrees we're gonna make that five or if the
difference is 80 degrees we're gonna make that eight we're gonna do the same
thing for the wind the wind is 20 knots it's gonna be - the wind is 50 knot it's
gonna be 1.5 and the reason I do that is just to simplify my life all right so if
the difference is 20 degrees right now it's just a 2 you're gonna add 2 to that
make it a 4 or if the difference is 50 degrees we're gonna make it a 5 add 2 to
that 7 so you kind of get the idea here 80 degrees 8 to 10 I'll explain to you
why the 8 isn't purple in just a second here but what what my point is is no
matter what it is whatever the difference is you're gonna take that
make it just the base the root number so 2 or 5 or 8 or whatever it is and you're
gonna add 2 to that number so now that you have that that that new number so 2
plus 2 is 4 now you have a difference of 4 here on the second row you're gonna
multiply the difference by the wind so 4 times 1.5 equals 6 6 is your cross
wind component 7 times 2 14 is your cross wind component and then of course
10 times 3 is 30 30 sequestering component so let me explain to you why I
have 8 in purple here this first one if you're eight it means you're 80 degrees
off the tip of your wing so you're 80 degrees off the tip of your
wing or 90 degrees off your tip your wing or a hundred degrees off the tip of
your wing essentially it is a direct crosswind so when I when I did the math
in my head and I go oh okay so it's 80 degrees off the tip of my wing I don't
even need to do the math I just go it's 80 degrees off the tip of the wing and
then I'm gonna use that whatever that wind is that's my cross wind component
if you're landing on runway seats three six the win stitute the wind's coming
from two seven zero at 30 knots there's no need to do math it's it's a thirty
nine cross one that's why I put eight and eight in purple so if it's eight
eighty degrees or 90 degrees or even a hundred degrees meaning it's slightly
behind the wing any of those I just use it as just a flat that whatever the wind
is across with a component so you don't
even need to do the math on that from 7:00 and less that's where you start to
do the math I'm learning so much this is exactly what I did
so the first scenario is your your wind is 0 for 0 10 knots you're landing on
runway 9 we got a 50 degree difference between
the runway you're landing on and the wind the wind is 10 knots so right here
I made the math real simple 5 which is 50 degrees dropping the 0 plus 2 equals
7 7 times 110 not minus the 0 so 7 times 1 equals 7 you have a cross one
component of 7 I went on to an online calculator and calculated the cross 1
component based off of this scenario to show you what the computer spit out so
here I put in all the numbers runway 9 0 4 0 Winston knots crosswind component
they gave me was 8 my cross wind component by doing in my head is 7 if
you can fly one not good for you I'm just not that good so when I'm
calculating this stuff I want to get a basic idea of what it is I'm gonna be
getting into when I'm getting ready to land that's it at the end of the day
you're gonna fly that aircraft but this gives you an idea of what you're getting
into let's do another scenario now all right your winds 2 5 0 at 15 knots
you're laying at runway 1 8 so you got a 70 degree difference between the runway
you're landing on and the win get down here to the math 7 plus 2 equals 9 9
times 1.5 equals 14 now I'm not really good with decimal points and Matt and
multiplication on those things so what I do in these scenarios as I go 9 is close
to 10 so 10 times 1.5 is 15 and then I just drop a naught so 14 and I just do
that just to make things easy for myself I just try to simplify everything as
much as possible so this gave us a cross 1 component of 14 knots and the computer
says the exact same thing 14 knots sometimes going to be right on sometimes
you might be an odd or two off again it doesn't really matter you just want to
get a basic idea of where you're at all right crew this scenario is for you guys
to solve yourself in the comments below so you're laying in runway 9 the
zero six zero at 18 knots oh I made it 18 knots so you can get some real-world
math here for yourself and start practicing like what I said earlier
take that 18 make your life simple round that to 20 when you get to the end and
you have your cross one component drop a knot or two that'll give you a
pretty good idea of where you're at in the comments section below let me know
what the crosswind component was and if this videos been helpful for you and if
you have any questions if you haven't joined the seven-four crew consider
subscribing I look forward to hearing from you until then keep the blue shadow