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how much stronger is the wind in 30m height? See this!

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Toby
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how much stronger is the wind in 30m height? See this!

Postby Toby » Fri May 04, 2007 7:21 am

Image

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pierre.d
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Postby pierre.d » Fri May 04, 2007 7:34 am

If I read it right, when I have 20 knots with my anenometer there is only 15 knots at a height of 20 m. That's interesting, my belief was that the wind was faster above ... Toby, you confirm ?

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Postby TheRussian » Fri May 04, 2007 7:41 am

:roll:

nope....

you've got your axis mixed up Pierre :D

20knots with your anenometer there is 27 knots at a height of 20m

So explains why windsurfers struggle more than kites in light winds and the higher you boost, the higher you should go :D :D :D
Last edited by TheRussian on Fri May 04, 2007 7:43 am, edited 1 time in total.

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Postby BullsShit.com » Fri May 04, 2007 7:41 am

seems right...feels like it as well.

Ever seen gusts coming at you with water flying ?

Gust are at least 30 + and you are still standing (kiting) with a 12m kite.

But, I think when close to shore with big trees (palms) the wind is just as strong up there, but it also creates uplift right there, so...

interesting never the less..

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Postby Pump me up » Fri May 04, 2007 8:15 am

Thanks for putting that up.

It proves the point when ram lovers like Dr Lightwind and Chris Calthrop make ridiculous claims about ram airs (like Flysurfer kites) excelling in light winds.

Dr L recently put up a post showing his exceptional riding skills in light wind (aka ploughing back and forth, barely holding ground) while a handheld wind meter showed ~6 knots at ground level. Obviously it would have been ~8k at the level of the kite - the starting point for both ram airs and inflatables.

Typical ram air lover lies and exaggerations. Ignore the lies. Ignore the exaggerations. Ram airs are aerodynamically inferior compared to inflatables and nothing can change this.

PMU

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Postby pierre.d » Fri May 04, 2007 8:39 am

you've got your axis mixed up Pierre
got it, I was drinking my coffee ...not really awake.

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Postby Jan:) » Fri May 04, 2007 8:43 am

Hmm, I don't really think its true.

47 Knots at 25m when measuring 30 Knots on the ground just seems way off.
Same for 38 Knots at 25m when measuring 25 Knots on the ground.

Where is that data from?

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Postby xr » Fri May 04, 2007 9:14 am

Great diagram. But how accurate will this be? I agree that the wind gets stronger when you get higher up, but will this diagram be accurate for all locations?

I believe Peter (the maker of the diagram) is from Denmark or so. Has he used wind meters in the different height to messure the speed, or is this diagram based on physical laws (I'm not sure if that's the right word thou)? And again, if the test has been done in Denmark, will the same diagram apply for all other locations aswell?

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Postby kitesurf-ripper » Fri May 04, 2007 9:35 am

This is really interesting. Thanks for the info Toby!!

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Postby Dwight » Fri May 04, 2007 11:27 am

I find the wind gradient widest during the winter and spring with the water is cold and air hot.

During summer, when the water is 85 and the air about the same, almost no wind gradient at all.


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