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Crosswind components



 
 
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  #1  
Old February 24th 04, 04:13 PM
James L. Freeman
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Default Crosswind components

Can someone offer a non-mathematical EXPLANATION (as opposed to
DESCRIPTION) of why the speed of headwind and crosswind components of
a wind add up to more than the speed of the wind?

Thanks.
  #2  
Old February 24th 04, 04:22 PM
Andrew Crane
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"James L. Freeman" wrote in message
om...
Can someone offer a non-mathematical EXPLANATION (as opposed to
DESCRIPTION) of why the speed of headwind and crosswind components of
a wind add up to more than the speed of the wind?


The same reason the opposite and adjacent sides of a right angle triangle
add up to more than the hypotenuse. I guess that's mathematical, but it is
an explanation...

Regards
Andrew



  #3  
Old February 24th 04, 04:55 PM
mikem
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You shoulda stayed awake during trigonometry...

MikeM


James L. Freeman wrote:

Can someone offer a non-mathematical EXPLANATION (as opposed to
DESCRIPTION) of why the speed of headwind and crosswind components of
a wind add up to more than the speed of the wind?

Thanks.


  #4  
Old February 24th 04, 04:56 PM
Gary Drescher
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"James L. Freeman" wrote in message
om...
Can someone offer a non-mathematical EXPLANATION (as opposed to
DESCRIPTION) of why the speed of headwind and crosswind components of
a wind add up to more than the speed of the wind?


For the same reason that it's a shortcut if you can walk diagonally from one
corner of a city block to the opposite corner, rather than following the
roads around the block.

--Gary


Thanks.



  #5  
Old February 24th 04, 06:53 PM
Darrell
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It's because they are separate definitions of the crosswind and are not
additive.
--

B-58 Hustler History: http://members.cox.net/dschmidt1/
-

"James L. Freeman" wrote in message
om...
Can someone offer a non-mathematical EXPLANATION (as opposed to
DESCRIPTION) of why the speed of headwind and crosswind components of
a wind add up to more than the speed of the wind?

Thanks.



  #6  
Old February 24th 04, 10:13 PM
Andrew Sarangan
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Because wind has speed and direction. You cannot just add the numbers
to get the total. You have to do a vector sum (considering direction
and speed).



(James L. Freeman) wrote in message . com...
Can someone offer a non-mathematical EXPLANATION (as opposed to
DESCRIPTION) of why the speed of headwind and crosswind components of
a wind add up to more than the speed of the wind?

Thanks.

  #8  
Old February 25th 04, 10:59 AM
arcwi
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That's simple - it's a vector sum. But can someone explane this to me:

Scenario One

An aicraft is flying from A to B, TAS=200 Kts, Distance AtoB=100nm, Wind
blowing from B to A with a speed=100Kts
Everyone should be able to claculate that GS(A-B)=100 Kts and GS(B-A)=300
Kts , therefore round trip time A-B-A=60min+20min=1hr20min

Scenario Two

Same as One, but remove the wind completely. The GS in both cases = 200 Kts,
therefore round trip time A-B-A = 30min+30min = 1hr

Can someone explain the difference?

"James L. Freeman" wrote in message
om...
Can someone offer a non-mathematical EXPLANATION (as opposed to
DESCRIPTION) of why the speed of headwind and crosswind components of
a wind add up to more than the speed of the wind?

Thanks.



  #9  
Old February 25th 04, 11:09 AM
Stefan
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arcwi wrote:

Can someone explain the difference?


You spend more time in headwind than in tailwind.

Stefan

  #10  
Old February 25th 04, 12:04 PM
arcwi
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Yes, but the common logic suggest that you also spend less time in tailwind
that in head wind - and if there is no wind the two should cancell each
other... Or should they...

"Stefan" wrote in message
...
arcwi wrote:

Can someone explain the difference?


You spend more time in headwind than in tailwind.

Stefan



 




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