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how many knts does 5kg equal?

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un-hooked
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how many knts does 5kg equal?

Postby un-hooked » Mon Feb 26, 2007 9:14 am

most manufacturers quote wind ranges for 75/80kgs
so how many knts difference do you think 5kg multiples equals
i.e for someone 60kgs or 95kgs

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Postby flashboarder » Mon Feb 26, 2007 9:31 am

I would be very carefull with the given ranges. They are so many factors that are important to determine the wind range (kiteboarder's level, board, water condition, etc, etc) that it is impossible to define rules!

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Postby daft » Mon Feb 26, 2007 10:42 am

It's easy to correct the wind ratings to give an equivalent pulling force per kg of your weight. Click on this, then overtype the first number with your weight, and the second and third with the mfr reference weight and wind speed. Gives wind speed scaled for you (units don't matter as long as you keep them internally consistant):

http://www.google.com/search?hl=en&rls= ... tnG=Search

All it does is account for the force of the wind rising to the square of it's speed, eg. if you weighed 4 times as much you would only need twice the wind speed to get 4 times the force. For that approximation to be close, you'd probably also have to scale board size up or down in proportion to your weight difference.

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Postby Toby » Mon Feb 26, 2007 4:25 pm

maybe 1 knot per 5 kg?

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Postby Galeorn » Mon Feb 26, 2007 4:31 pm

Toby wrote:maybe 1 knot per 5 kg?
it is not sour because the output of the kites makes that apart from the average beach 1 nd perhaps lost easily or quickly wined

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Postby macca » Tue Feb 27, 2007 12:55 pm

They all ways under/over estimate wind speeds to give kites huge range on paper.
Infact most kites have a sweet spot of 6/7 konts in my experince.

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Postby Chris a. » Tue Feb 27, 2007 9:13 pm

1.5 knot per kg

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Postby Chris a. » Tue Feb 27, 2007 9:14 pm

sorry I wanted to say 1.5 knot per 5kg

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Postby daft » Tue Feb 27, 2007 9:50 pm

Is that for the top end figure on a small kite? Using 1.5kt or whatever seems to break down to absurdity if you look at the low end for a light person, for example (fly in 0 wind?).

Scaling things seems important because kites come in increasingly wide wind ranges, and the power of wind is steeply nonlinear. That is why I passed on the handy way to calculate this idea from another discussion (I can't vouch for it's accuracy myself):

yourSpeed = refSpeed * squareroot( yourWeight/refWeight )

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Postby un-hooked » Tue Feb 27, 2007 10:51 pm

the reason i asked the question is im going on holiday and dont want to take too many kites so i was trying to work out the rough wind range for my g/f on some of my kites

im 75kgs and have a kite with a 15knt bottom 30 knt top end end for me so just wanted an idea what the bottom /top end would be for her @ 60 kgs

so from the above i recon 13-26 would be about right


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