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foilboards are back :-)

Forum for everyone who is into racing and speeding on kites.


foiler
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foilboards are back :-)

Postby foiler » Mon Sep 20, 2010 8:00 pm

Congratulations to all foilers! They won in every class (open, master, youth, women) at the throphee st. clair in france.
here are some nice videos to watch: www.tropheesaintclair.com

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tautologies
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Re: foilboards are back :-)

Postby tautologies » Tue Sep 21, 2010 4:37 am

foiler wrote:Congratulations to all foilers! They won in every class (open, master, youth, women) at the throphee st. clair in france.
here are some nice videos to watch: www.tropheesaintclair.com


Was foils ever here? ;-) Kidding they are great fun.

How about uploading them to youtube so we can get automated subtitles....

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pouch
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Re: foilboards are back :-)

Postby pouch » Tue Sep 21, 2010 12:24 pm

Image
this time the tag is smaller ... :remybussi:

it was a nice race. nice wind and flat water. the racing level is increasing more and more, international level riders were there such as Julien Kerneur.

for the final ranking, 50 % of top ten riders were riding foil boards

sshields
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Re: foilboards are back :-)

Postby sshields » Tue Sep 21, 2010 5:55 pm

Is Foil a brand or are foilboards a type of board? What makes them great? Thanks. - S

ronnie
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Re: foilboards are back :-)

Postby ronnie » Tue Sep 21, 2010 6:59 pm

sshields wrote:Is Foil a brand or are foilboards a type of board? What makes them great? Thanks. - S


A type of board, excluded from most races. Goes upwind very well and very good in light winds.


gbleck
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Re: foilboards are back :-)

Postby gbleck » Tue Sep 21, 2010 7:34 pm

Not explicitly excluded under the ISAF class rules. The fin length restriction as a practical mater does restrict them.

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edt
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Re: foilboards are back :-)

Postby edt » Tue Sep 21, 2010 8:02 pm

sshields wrote:Is Foil a brand or are foilboards a type of board? What makes them great? Thanks. - S


hydrofoil boards are where you ride on an airplane wing under the water. They are much better than planing on a board because the total wetted surface is about half that of a traditional planing board so you have a higher top end speed and lower friction at slow speeds. It also allows you to go upwind faster because the foil acts like a center board.

Hydrofoil development on kiteboards is basically at year 1 in terms of engineering and physics of the boards, everyone is racing on some version of the airchair hydrofoil which is highly unstable making it unsuitable for high winds.

If you look at the development of sailing and hydrofoils includes such boat as the international moth

http://en.wikipedia.org/wiki/Moth_%28dinghy%29

the fastest sailboat in its class, with a front and back hydrofoil, it is still a bit unstable at high speeds, so it has a top end of about 35 knots.

Then there is the hydroptere, the fastest sailing vessel in the world

http://en.wikipedia.org/wiki/Hydropt%C3%A8re

max speed 52.86 knots

The foils on the hydroptere are well designed and very stable, however, this is such a big boat that at the top end, the hulls, masts and sails are all heavily stressed. It has capsized before in a gust, but I don't blame the hydrofoil for that.

I think it's really asking an awful lot of a kiteboarder to keep his weight constantly trimmed front back side, keep the kite in the proper direction and adjust his weight on an airchair hydrofoil. What is really needed is a proper dual foil board that has some negative feedback so it isn't so squirrelly, then you can race them in high winds, including the luderitz challenge.

Of course, if there is a lot of wind, there won't be a race because that will be a day for the real competition, so maybe the airchair foil design is good enough.

I love the foils, they are cool. People who use them, say it is sort of like a condom since you can't feel the water under your feet, so recreational kiters tend to go back to a regular board after trying out a foil board.

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Kamikuza
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Re: foilboards are back :-)

Postby Kamikuza » Wed Sep 22, 2010 1:00 am

Ah, I see now ... the guys in the front of the pic on the orange and red kites seem to be on the hydrofoil boards ...

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Re: foilboards are back :-)

Postby gbleck » Wed Sep 22, 2010 2:22 am

The key to the moth isn't two foils but the wand that automaticaly sets the amount of lift on the center foil relative to the height over the water. Ohh and they are testing a hard wing (like the mini americas cup cats and the last oracle ac boat) foiling moth for this years worlds. Pics on sailing anarchy.

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pouch
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Re: foilboards are back :-)

Postby pouch » Wed Sep 22, 2010 8:12 am

as far as I know one brand is producing serial hydrfoil boards.

carifino

independant shaper are also develloping their own product

http://jc-kiteboards.fr/news/


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