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 Post subject: New World record = 59.23 knots
PostPosted: Tue Nov 20, 2012 9:52 am 
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The new world record is average 59. knots ; but the guy
went 63 knots. That's Hulling-Ass !!!

Bille

http://www.youtube.com/watch?v=wnjyusAg ... ploademail

IT WAS NOT DONE WITH A KITE BOARD


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 Post subject: Re: New World record = 59.23 knots
PostPosted: Tue Nov 20, 2012 10:17 am 
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Awesome :thumb:

2½ times the wind speed, done in only 25 knots I heard ?

:D Peter


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 Post subject: Re: New World record = 59.23 knots
PostPosted: Tue Nov 20, 2012 10:50 am 
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:thumb: :thumb:

Awesome.


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 Post subject: Re: New World record = 59.23 knots
PostPosted: Tue Nov 20, 2012 11:02 am 
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Wow, that is amazing!!!

Congrats!

Really? Only 25 knots? Imagine guys what happens in 40 knots!!!


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 Post subject: Re: New World record = 59.23 knots
PostPosted: Tue Nov 20, 2012 11:35 am 
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Toby wrote:
Wow, that is amazing!!!

Congrats!

Really? Only 25 knots? Imagine guys what happens in 40 knots!!!


It breaks.....


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 Post subject: Re: New World record = 59.23 knots
PostPosted: Tue Nov 20, 2012 1:53 pm 
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Just stick your head out your car window at that speed...feel the wind in your hair..if you have some left

Conversion into miles per hour
59.23 kn = 68.161 mph......................63 kn = 72.499 mph

Conversion into kilometers per hour
59.23 kn = 109.694 kph...................63 kn = 116.676 kph

......................................... :runaway: ............. :winner2: .............................................................................


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 Post subject: Re: New World record = 59.23 knots
PostPosted: Tue Nov 20, 2012 3:48 pm 
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but damn, that's it for the kiters...or not?


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 Post subject: Re: New World record = 59.23 knots
PostPosted: Tue Nov 20, 2012 4:04 pm 
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Toby wrote:
but damn, that's it for the kiters...or not?


Sebastian Cattelan has recorded 61.25 knots over a 2 second interval at Luderitz, so it is possible for kiters (and possibly windsurfers) to get above 60 knots for 500m if they have perfect wind strength and direction and the water is also perfect.

There is a doubt about the windsurfers though because the Sailrocket used to be limited by cavitation on their hydrofoil and they put fencing on the foil to reduce the aeration.
The windsurfers may run into a similar problem on their fins, but if they dont then they are also in the race.


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 Post subject: Re: New World record = 59.23 knots
PostPosted: Tue Nov 20, 2012 4:33 pm 
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Being able to do it in 20 knots really helps. Lots simpler to get a flat 500m coarse in 20 knots then in 40+ knots. I'm thinking hard sail kites. Has anyone tried building one yet?


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 Post subject: Re: New World record = 59.23 knots
PostPosted: Tue Nov 20, 2012 4:36 pm 
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Correct me if I'm wrong but cavitation for foils starts at 50 knots, and what I think sailrocket has done is redesign their foils so once they reach a certain speed, the entire underside of the foil cavitates, so you have reduced drag when that happens, but below 52-53 knots this cavitating foil induces a lot of extra drag as the cavitating bubbles loop back into the foil. At least that's one theory. I'm not sure anyone knows exactly how their foils work, because they are not working via a modelling program (found it didnt work for their situation), they tune the foil and go out again over and over again. They've been doing this for ten years . . . . So they are doing something really advanced here, that nobody else in the world is doing, and all from a practical standpoint not really any theory. It might be years before we really understand why this particular foil lets them break through the foil barrier of 52-53 knots. I dont see hydroptere ever catching them, it's going to take an entire boat redesign for a megayatch foil to get up to sailrocket speeds.

Of course, kiteboards right now are not foiling, they are planing, so theoretically the only top speed for kiters is how much wind we we get in luderitz and the size of their balls.


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