Measuring Wind (Was: Re: Wind Meters

Measuring Wind (Was: Re: Wind Meters

Post by Simo Salan » Thu, 09 Sep 1993 16:07:20



Quote:
>method (that I'm aware of).  Is there some other way to be accurate to
>within 1 mph?  Are the wind ratings on kites based on ground wind?  Given
>the right textures on the ground, the wind twenty feet up can easily be
>+/- 5 mph from ground winds.  Is there some mysterious way to calculate
>the difference?

Only the plus sign applies; If you measure the wind speed with a meter
in your hand, you can be sure the wind speed will be more above that level.

In a competition this measuring method works well for the check
of minimum wind speed condition. Check for maximum wind condition
is more difficult because it should be done on top of wind window.
Although the rule book does not say anything about the measuring
levels, in practice the check for maximum is also done at the
height the field director can reach.

You can also expect the wind ratings for kites are based on
estimates (measurements?) on ground level.

"Sailing Theory and Practice", by Marchaj (sp?) has some
empirical models, which should be applicable for beach
conditions. Inland conditions differ because of the texture
of the ground.

Smooth Winds

Quote:
>Sighhh...I'm glad I don't have to be an aerospace engineer to enjoy
>stunting...<g>.
>David J. Harris
>---------------------------------------


>Compuserve: 71776,523

 
 
 

Measuring Wind (Was: Re: Wind Meters

Post by Sam Ritter x31 » Fri, 10 Sep 1993 22:18:21

Quote:


>>method (that I'm aware of).  Is there some other way to be accurate to
>>within 1 mph?  Are the wind ratings on kites based on ground wind?  Given
>>the right textures on the ground, the wind twenty feet up can easily be
>>+/- 5 mph from ground winds.  Is there some mysterious way to calculate
>>the difference?

>Only the plus sign applies; If you measure the wind speed with a meter
>in your hand, you can be sure the wind speed will be more above that level.

I have to differ from your statement here.  The ground wind is great for the
stunters, but there have been many times when launching a single line kite
that the kite will hit dead layers -- no wind!!!  It's happened to me many times
since I have gotten more into the single line kites.

If you would have said this to me last year at this time, I wouldn't have
written this, but through my experience this year, you can definitely run into
less wind at higher altitudes.

Good Winds

Sam Ritter

 
 
 

Measuring Wind (Was: Re: Wind Meters

Post by Andrew Beatt » Sat, 11 Sep 1993 00:32:55

Quote:
>>Only the plus sign applies; If you measure the wind speed with a meter
>>in your hand, you can be sure the wind speed will be more above that level.
>I have to differ from your statement here.  The ground wind is great for the
>stunters, but there have been many times when launching a single line kite
>that the kite will hit dead layers -- no wind!!!  It's happened to me many
>times since I have gotten more into the single line kites.

Yes.  Peter Lynn reports that he has been ski-buggying on snowy slopes where
the only wind is the chilled surface air sliding down the hillside.  The only
wind available was confined to a band a few meters above the surface

Andrew
--




 
 
 

Measuring Wind (Was: Re: Wind Meters

Post by Simo Salan » Sat, 11 Sep 1993 03:17:54


Quote:
>I have to differ from your statement here.  The ground wind is great for the
>stunters, but there have been many times when launching a single line kite
>that the kite will hit dead layers -- no wind!!!  It's happened to me many times
>since I have gotten more into the single line kites.
>If you would have said this to me last year at this time, I wouldn't have
>written this, but through my experience this year, you can definitely run into
>less wind at higher altitudes.

Sam, your'e right.

My thinking was too limited to stunt kite flying
(& sailing) conditions.

Simo