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Heading/tail Wind Qusetion  
User currently offlineaerdingus From Ireland, joined Dec 2006, 2826 posts, RR: 15
Posted (3 years 9 months 2 weeks 1 day 16 hours ago) and read 3958 times:

Hi everyone,

Say if I'm on a heading of 230, & there's a wind of 40kts on a heading of 247, would my speed increase that much? Or would I have to be on the exact heading?

Thanks  


Cabin crew blog http://dolefuldolegirl.blogspot.ie/
6 replies: All unread, jump to last
 
User currently offlinejohnkrist From Sweden, joined Jan 2005, 1399 posts, RR: 6
Reply 1, posted (3 years 9 months 2 weeks 1 day 12 hours ago) and read 3936 times:
AIRLINERS.NET CREW
HEAD SUPPORT

It wouldn't increase that much no, it would increase 38 knots, pretty close since the heading of the wind almost is equal to your heading.


5D Mark III, 7D, 17-40 F4 L, 70-200 F2.8 L IS, EF 1.4x II, EF 2x III, Metz 58-AF1
User currently offlineaerdingus From Ireland, joined Dec 2006, 2826 posts, RR: 15
Reply 2, posted (3 years 9 months 2 weeks 1 day 12 hours ago) and read 3931 times:

Quoting johnkrist (Reply 1):

Thanks for that man, now I am DIABOLICAL* at maths, can I ask where does the 38kts come from?   

Cheers

* And evidently also at spelling: "Qusetion"?! wtf?!

[Edited 2010-11-10 13:40:03]


Cabin crew blog http://dolefuldolegirl.blogspot.ie/
User currently offlineFly2HMO From , joined Dec 1969, posts, RR:
Reply 3, posted (3 years 9 months 2 weeks 1 day 11 hours ago) and read 3923 times:

Quoting aerdingus (Thread starter):
would my speed increase that much?

WHAT speed? Groundspeed? True Airspeed? Indicated Airspeed?

TAS and IAS would not change (not instanteneously at least). Groundspeed would increase a bit.

Quoting aerdingus (Reply 2):
can I ask where does the 38kts come from?
http://www.csgnetwork.com/e6bcalc.html


User currently offlineMir From United States of America, joined Jan 2004, 21556 posts, RR: 55
Reply 4, posted (3 years 9 months 2 weeks 1 day 3 hours ago) and read 3884 times:

Quoting aerdingus (Thread starter):
Say if I'm on a heading of 230, & there's a wind of 40kts on a heading of 247, would my speed increase that much?

Unlike your airplane's heading, wind is read in the direction it's coming from, not the direction it's going to. So if you're on 230 and the wind is reported at 247, it's a headwind, and your speed will decrease instead of increase.

Quoting aerdingus (Thread starter):
Or would I have to be on the exact heading?

No, the wind can be way off your course and still give you more of a headwind/tailwind component than crosswind component.

Quoting Fly2HMO (Reply 3):
Groundspeed would increase a bit.

If by "a bit" you mean 39 knots, then yes.  

-Mir



7 billion, one nation, imagination...it's a beautiful day
User currently offlinejohnkrist From Sweden, joined Jan 2005, 1399 posts, RR: 6
Reply 5, posted (3 years 9 months 2 weeks 1 day 2 hours ago) and read 3882 times:
AIRLINERS.NET CREW
HEAD SUPPORT

Aerdingus, it's an easy formula that uses COS where COS(0)=1(equals tailwind) and COS(180)=-1. (equals headwind), and as Fly2HMO indicates, this is only true for ground speed.
So in your case your relative heading to the wind is 17 degrees (230-247) you get COS(-17)=approx 0.95. That factor is then multiplied with the windspeed, in this case 40kts gives the result of approx 38kts.

Hope I made it clear, I am not a teacher  



5D Mark III, 7D, 17-40 F4 L, 70-200 F2.8 L IS, EF 1.4x II, EF 2x III, Metz 58-AF1
User currently offlineaerdingus From Ireland, joined Dec 2006, 2826 posts, RR: 15
Reply 6, posted (3 years 9 months 2 weeks 1 day 1 hour ago) and read 3876 times:

Quoting Fly2HMO (Reply 3):
Indicated Airspeed?

  

Quoting Mir (Reply 4):
Unlike your airplane's heading, wind is read in the direction it's coming from, not the direction it's going to. So if you're on 230 and the wind is reported at 247, it's a headwind, and your speed will decrease instead of increase.

Ohhhhhhhhhhhhh this makes so much more sense now......

Quoting johnkrist (Reply 5):
Hope I made it clear, I am not a teacher

Cheers John

Thanks everyone  



Cabin crew blog http://dolefuldolegirl.blogspot.ie/
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