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 Post subject: Re: Titanium Foil
PostPosted: Fri Dec 13, 2013 1:19 pm 
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windfreak74 wrote:
Great Job! Looks like a lot o fun prototyping and testing!
being a twin tip foil what is the performance loss yoou feel from directional foils.
can you compare them by categorie?
upwind, stability, speed... etc:
Pedro

I felt it wants to go upwind better than downwind, I will try some other wings to test the difference later.


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 Post subject: Re: Titanium Foil
PostPosted: Fri Dec 13, 2013 2:12 pm 
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Nice work! Thanks for keeping us current on your progress.


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 Post subject: Re: Titanium Foil
PostPosted: Fri Dec 13, 2013 2:20 pm 
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Hawaiis wrote:
You have read my mind.


Well it's quite a good mind, so I'm not surprised you don't want titanium impaled in it. :D

I said elsewhere that I could imagine the role of the twintip foil as a foil learning tool or for light wind, but that would possibly need it to have straps or skyhooks or something to make it easier.


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 Post subject: Re: Titanium Foil
PostPosted: Fri Dec 13, 2013 7:03 pm 
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I have ordered the Henning's twin tip rotating foot straps from Denmark, it wouldn't arrive til next year.


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 Post subject: Re: Titanium Foil
PostPosted: Sun Dec 29, 2013 5:56 am 
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The rotating foot pads came today.


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 Post subject: Re: Titanium Foil
PostPosted: Mon Dec 30, 2013 3:30 am 
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Went out to try the new board today, the wind was dead on shore 6-12 knots, was unable to get out of shore break, tried a friend's potato board and was easier to get out and ride. Hydrofoils need more power to get going, the twin tip with 3 wing need even more than the directional with 2 wings.


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 Post subject: Re: Titanium Foil
PostPosted: Mon Dec 30, 2013 7:19 pm 
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Hawaiis wrote:

... Hydrofoils need more power to get going, the twin tip with 3 wing need even more than the directional with 2 wings.


So--- they need More power to get started , but once they get going they
need Less power to keep going ? I had a wrong idea about the foils ; i thought
they needed Less power to make them go ?

It's gonna be Fun , to feel that for myself one-day !!

Bille


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 Post subject: Re: Titanium Foil
PostPosted: Mon Dec 30, 2013 9:12 pm 
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When the foil is in the water, it has more drag due to the size of the foil, once the foil lift the board off the water, it reduces the drag of the board, and it only need 6 knots speed to lift off.


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 Post subject: Re: Titanium Foil
PostPosted: Tue Dec 31, 2013 6:41 am 
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Location: Langebaan (Cape Town)
I think there is some confusion here? 99% of the time I would say a hydrofoil also needs less power to take off than other boards (except maybe a huge 70cm wide racboard that has a lot more floatation).

The other 1% of the time is in difficult conditions with waves and onshore wind when technique makes a very big difference to how low wind you can take off in. I do not find the foil to have more drag in the water. It could maybe have to do with the type of board and the angle between the board and foil? On my boards the foilboard has very little drag even witht the board on the water.

Another reason might be because Hawaiis is using a larger kite than I normally use. I use a 14m as my largest kite (and I weight 95kg), so for me the hydrofoil can take off in lighter winds than I could with any other board. Maybe a lighter guy on a bigger kite will have a much easier time taking off with normal boards in very light conditions, and then the hydrofoil feels like it has less light wind take of capability?


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 Post subject: Re: Titanium Foil
PostPosted: Tue Dec 31, 2013 8:26 am 
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I was using a 11m yesterday, and later switched to 13m. The shore break was stronger than usual. With the foils catching the shore break, I was constantly pushed on shore. Even body dragging with the foil is impossible. I did a test with foil and surfboard in the water, and the foil went much further down wind than the surfboard.


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