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Wave oriented hydrofoil

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Zeeko
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Re: Wave oriented hydrofoil

Postby Zeeko » Tue Jan 26, 2016 12:02 pm

flying grandpa wrote:
Zeeko wrote: Hi,
Ventilation is mostly due to very small holes on the leading edge
Sorry, Nicolas
it looks we misunderstood each other.
I had in mind front foil ventilation. It happens to me quite often during waveriding, but thanks to nice profile and enough amount of FF twist (I presume), it is easy to recover without falling. I still shake a bit , and my suggestion re FF small dihedral was directed to eliminate even this small shake to enhance rider comfort.
Mast ventilation happened after 2 weeks of riding, and good remedy was simple soap bath, to eliminate any oils from mast surface.

Tadeusz
Yes That's true,
but by experience, a very clean foil (well sanded) is a very good and better way to ride in waves than additionning any dihedral. Sanding cleanly the foil prevent also ventilation (please never sand an alloy anodised mast, we are talking about carbon foil, and sanding is only good for very good riders looking at the limits of the ride either in race and in waves). And you keep a flat wing.
The flat wings are very good for waves as the center of turning for the hydrofoil will be between the back wing and the mast. If you use any anhedral or dihedral front wings in waves, it makes the center of turning will be between the mast and the front wing which is less confortable for engaged carving.
Last edited by Zeeko on Tue Jan 26, 2016 12:21 pm, edited 1 time in total.

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Starsky
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Re: Wave oriented hydrofoil

Postby Starsky » Tue Jan 26, 2016 12:18 pm

Zeeko wrote:
Yes That's true,
but by experience, a very clean foil (well sanded) is a very good and better way to ride in waves than additionning any dihedral. Sanding cleanly the foil prevent also ventilation (please never sand an alloy anodised mast, we are talking about carbon foil, and sanding is only good for very good riders looking at the limits of the ride either in race and in waves). And you keep a flat wing.
The flat wings are very good for waves as the center of turning for the hydrofoil will be between the back wing and the mast. If you use any anhedral or dihedral front wings in waves, it make the center of turning will be between the mast and the front wing which is less confortable for engaged carving.
Thank you for the insight.

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Re: Wave oriented hydrofoil

Postby joyrider1 » Tue Jan 26, 2016 1:18 pm

Zeeko wrote: ... as the center of turning for the hydrofoil will be between the back wing and the mast. If you use any anhedral or dihedral front wings in waves, it makes the center of turning will be between the mast and the front wing ...
Hi Nicolas,
what do you mean by "the center of turning" for the hydrofoil?
What plane/axis is meant?
Thank you for helping me understand this.... :D

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Starsky
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Re: Wave oriented hydrofoil

Postby Starsky » Tue Jan 26, 2016 2:52 pm

Pretty sure he's talking about yaw.....vertical axis

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Re: Wave oriented hydrofoil

Postby Zeeko » Tue Jan 26, 2016 3:55 pm

Yes Starsky, I mean it changes the Yaw rotation center

Flatter is your front wing and more backward is the yaw axis (and finally closer to a surfboard yaw axis).
This is helpfull for waveriding,
for Racing and freeriding, it is better to have the axis more frontward (thanks to the anhedral front wings) because you want to do jibes and tacks also (tacks are easier with frontward yaw axis)
Also, if you can change the size of your vertical fin backwards (or the size of the winglets of your stabilisator) it will act in the same way.
This is why I use different vertical fins on the back of the fuselage it changes a lot the behavior of the hydrofoil.
Ride easy
Nicolas

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Re: Wave oriented hydrofoil

Postby joyrider1 » Tue Jan 26, 2016 4:20 pm

Thank you Starsky and Nicolas, now I know what you mean :D
The vertical aspect of the anhedral/dihedral should act like a small fin in front of the strut...

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Re: Wave oriented hydrofoil

Postby BraCuru » Tue Mar 07, 2017 10:49 am

This is summary of my latest ultimate wave hydrofoil:
- delta wings - for the best manoeuvrability,
- low AR wings (max 3) - as above and slower speed,
- canard design - for improved manoeuvrability and HF lifespan,
- dihedral wings (small angle) - to add more stability to the unstable design and minimise contact with the bottom,
- thick wings (max thickness around 25mm) to reduce speed,
- strut expandable 70-90cm and thick 20mm (to slow down the foil),
- carbon-glass fuselage with aluminium core- diameter 20mm, length less than 60cm
- carbon strut,
- G10 or alu wings.

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Re: Wave oriented hydrofoil

Postby ulx » Wed Mar 08, 2017 11:27 am

Yes, slowing down the foil for waves seems to be a good idea. I thought so too several times recently. Getting too fast down the wave can really make it very hard to keep the board from touching the water or getting air. Especially in not so clean waves.

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Re: Wave oriented hydrofoil

Postby BraCuru » Sun Mar 19, 2017 9:17 pm

From other topic:
plummet wrote:
Sun Mar 19, 2017 7:32 pm
maybe a canard delta design with stupid low aspect?

Image
this is what I am talking about wave foil.

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Re: Wave oriented hydrofoil

Postby stevez » Mon Mar 20, 2017 3:47 am

BraCuru wrote:
Tue Mar 07, 2017 10:49 am
This is summary of my latest ultimate wave hydrofoil:
- delta wings - for the best manoeuvrability,
- low AR wings (max 3) - as above and slower speed,
- canard design - for improved manoeuvrability and HF lifespan,
- dihedral wings (small angle) - to add more stability to the unstable design and minimise contact with the bottom,
- thick wings (max thickness around 25mm) to reduce speed,
- strut expandable 70-90cm and thick 20mm (to slow down the foil),
- carbon-glass fuselage with aluminium core- diameter 20mm, length less than 60cm
- carbon strut,
- G10 or alu wings.
Do you really want unwanted drag? Even for waves you want to minimise this - surely in the optimum setup every factor that causes drag should have a purpose (like providing lift / stability etc)?


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