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  1. #8
    Senior Member Navegante's Avatar
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    Quote Originally Posted by duzzi View Post
    I am not so sure about hydrofoils in their current incarnation. There are 2-3 windsurf hydrofoils at Crissy (in San Francisco) and people are still learning the ropes on them. They all seem to have problems staying on the hydrofoil during a jibe or tack.

    Much more common are Kite hydrofoils, of which there is a relatively large fleet. They are more efficient than non-hydrofoil kites (that are pretty dismal actually) and they seem the only type of Kite that can be used safely at Crissy with its big currents and wind drops.

    But ... they are slow! and I mean very slow. Sure they have a great upwind and straight down wind angle and in a triangle competition they are sure winners, but they are often slower than my RRD FSW 85 (yes, it is VERY much fun to pass a ultra-high-tech Kite on hydrofoil with a 5.0 sail!). And ... they are BIG: huge contraptions that make a windsurf look so simple by comparison. And ... I am not even sure about efficiency: people are using 15-18 even 20 square meters on those things, and then yes they go up in little wind. But put a 10 on them and the range seems the same of a 6.0/100 windsurf.

    So, by extension I am not so sure a windsurf hydrofoil is such a great idea. If it was as fast and maneuverable as a regular windsurf yes, but I do not think we are there yet.

    In in the South of France they are using the foils as a light wind alternative. Getting up above the water sometimes in as little as 7 knots.
    A couple of weeks ago I was in a spot where the only two crafts planning were a foil kite with a 12 possibly and the other was me with a 85cm wide board and a 9.5 S-Type sail.
    Possibly about 10kts of wind with very brief gusts of maybe 12 to get you planing and then keep on on your apparent wind.

    so at the moment I see it as something possibly fun because you can afford it rather than "the" alternative.

  2. #9
    Senior Member Navegante's Avatar
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    Ps:
    the jibing is a problem because of the loss of speed and to cope with that it is recommended that this Tuttle slot foils are put on a 110/120 l board.

    I can imagine that dual purpose boards may come out where the fin slot is placed in the usual place for finned board use and another slot placed somewhere forward for foil use.

  3. #10
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    This is the Defi Kite run last year in light winds. They are fairly fast across the wind in light conditions.
    https://vimeo.com/96567004

    In 2013 in strong wind the best kite foilers beat those on kite race boards across the wind. The guy in green with the yellow board won.
    https://vimeo.com/75228119

    North have a foil that is mounted quite far back. I don't know if it will suit a windsurfer, but it might. It's expensive.
    Click image for larger version. 

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  4. #11
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    A foil in very light wind.

    https://www.youtube.com/watch?v=GLVv3rqU3PA

  5. #12
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    A couple of years ago a good kiter had one in El Medano andwas sailing well until he hit chop and stopped dead, in a splash, a few times then came back in. The windsurfing videos are also in flat locations.

  6. #13
    Senior Member Navegante's Avatar
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    Quote Originally Posted by boards_ronnie View Post
    This is the Defi Kite run last year in light winds. They are fairly fast across the wind in light conditions.
    https://vimeo.com/96567004

    In 2013 in strong wind the best kite foilers beat those on kite race boards across the wind. The guy in green with the yellow board won.
    https://vimeo.com/75228119

    North have a foil that is mounted quite far back. I don't know if it will suit a windsurfer, but it might. It's expensive.
    Click image for larger version. 

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    Yeah! Alex mon ami!

  7. #14
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    Quote Originally Posted by Navegante View Post
    Yeah! Alex mon ami!
    Yes! After the foils dominating in 2013 and looked like they were dominating in 2014, out came Alex (World kite speed record holder at 56+ knots) and whupped everyone on his speed crossing race board.

    So the jury is still out on what is the fastest across the wind.

    http://translate.google.co.uk/transl...an&prev=search

    I think gybes will be doable without touching down once the equipment is a bit more developed. Foils can be turned quite tightly, so momentum could keep it foiling through a gybe.

    This guy seems to think the duck gybe is the solution.
    https://www.youtube.com/watch?v=x6QOG2gNq0g

    The kite foils are still developing at a rate.
    Currently the rear wing is upside down on most foils to help steady things when the board is tilted nose up or down. Because the foil is 1 metre away from the board, the centre of uplift would tend to move too far forward if the nose was raised. Having the rear wing upside down counteracts that a bit and makes it easier to keep everything balanced.
    I think there may be a possibility that they could have two positive lift wings in a canard configuration, but we shall have to wait and see when the development reaches the limits.

    Certainly a foil-specific board like the AHD could be developed. The kite foil boards tend to be about 160 by 52 by 7cm with deep double concaves under the nose and chamfers on the rails - but they vary a lot in design.
    Last edited by boards_ronnie; 25th April 2015 at 12:03 PM.

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