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 Post subject: Re: Hydro Foil almost done
PostPosted: Sat Oct 27, 2012 6:04 pm 
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gmb13 wrote:
Great little Vid!

... If there is one thing Foils don't like it's Air Bubbles in the water :-)



--
Gunnar


Gunnar -- is that why the flo-gates are located on the top of the airfoil of Hydroptere
pictured here ?

Bille


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Hydroptere.jpg [ 71.96 KIB | Viewed 1041 times ]
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 Post subject: Re: Hydro Foil almost done
PostPosted: Sat Oct 27, 2012 6:29 pm 
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Nico wrote:
Bille,
Mold it. No one will ever say a thing unless you start production : )
This will save you tons of grief and R&D.
Just M O though
Nico


Yes , nobody would say anything if i molded a production board ; for me it
would be easy , and the epoxy gel-coat on the mold would look like a glass
mirror when i finished.
But
Your talking to a guy that slammed in from 450ft on a HG ; then Died. And
stayed dead till the lifeguards climbed up the cliff and did CPR. This was Not
the accident where i lost my legs !!
I haven't stolen anything since that day in the mid 80's, because i know it could
happen at any moment again.

This isn't meant to be some religious sermon , but before 1985 i would Not think
twice about dating a neglected or abused married woman ; & now i Wouldn't do that
even though the offers still present themselves.

This is a reminder of just how Bad a day can get ; yea that's me in the shot !

And with that note --- i choose to find another way to ride a foil, other than stealing it.

Bille


Attachments:
HAVING A BAD DAY.jpg
HAVING A BAD DAY.jpg [ 1.05 MIB | Viewed 1031 times ]
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 Post subject: Re: Hydro Foil almost done
PostPosted: Sat Oct 27, 2012 7:22 pm 
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Location: Fuerteventura
Bille wrote:
gmb13 wrote:
Great little Vid!

... If there is one thing Foils don't like it's Air Bubbles in the water :-)



--
Gunnar


Gunnar -- is that why the flo-gates are located on the top of the airfoil of Hydroptere
pictured here ?

Bille


Sort of.

The Gates prevent any air that results from cavitation to create an airpocket around the Wing that would result in a spinout.

We experimented with that on the main mast to solve the spin out problem during manoeuvres which put a lot of sideways force on the mast. In the end changing the profile of the mast was enough to stop the mast pulling air.

--
Gunnar


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 Post subject: Re: Hydro Foil almost done
PostPosted: Sat Oct 27, 2012 7:42 pm 
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Just FYI.

This is our newest build just finished yesterday. Sixth Generation.

Attachment:
Hydro v6 collage b.jpg
Hydro v6 collage b.jpg [ 812.11 KIB | Viewed 1008 times ]


Managed to make it way more stable by extending the Fuselage. The new profile and new back wing shape made a huge difference in Speed and control.

--
Gunnar


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 Post subject: Re: Hydro Foil almost done
PostPosted: Sun Oct 28, 2012 5:11 am 
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Location: Mauritius, waterman since 1960
JMF thanks for the clarification.
and all the more respect to you for mentioning it.
Rgds
Nico


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 Post subject: Re: Hydro Foil almost done
PostPosted: Sun Oct 28, 2012 6:01 am 
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gmb13 wrote:
Sort of.

The Gates prevent any air that results from cavitation to create an airpocket around the Wing that would result in a spinout.

We experimented with that on the main mast to solve the spin out problem during manoeuvres which put a lot of sideways force on the mast. In the end changing the profile of the mast was enough to stop the mast pulling air.

--
Gunnar



Sorry to tech out,
Think you mean ventilation not cavitation. Ventilation is when air is sucked down the low pressure side of the foil, causing hydrofoil to become airfoil..... Cavitation is when the pressure drops so much the water begins boiling causing hydrofoil to become airfoil. (usually only happens around 50-60knots) but then again maybe you flysurfer guys are secretly riding those foils REALLY fast. :o


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 Post subject: Re: Hydro Foil almost done
PostPosted: Sun Oct 28, 2012 9:01 am 
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Johnny Rotten wrote:
gmb13 wrote:
Sort of.

The Gates prevent any air that results from cavit ...

--
Gunnar



Sorry to tech out,
Think you mean ventilation not cavitation. Ventilation is when air is sucked down
...


Gunnar placed a disclaimer with that opening line : "Sort of" .

Anyway i got the idea about how the air bubbles destroy the lift with his explanation.

Bille


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 Post subject: Re: Hydro Foil almost done
PostPosted: Sun Oct 28, 2012 10:04 am 
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No no. Johnny is right. I meant Ventilation when talking about our Main mast sucking air.

You learn a new english term every day :-) Thanks Johnny!

--
Gunnar


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 Post subject: Re: Hydro Foil almost done
PostPosted: Sun Oct 28, 2012 12:11 pm 
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Location: Teahupo'o, Tahiti
Gunnar that foil looks bad ass. Thats the length of that fuselage if I may ask. I also went a little longer on mine 760mm.

Below a video of a foil caveating, pretty amazing stuff.



Last edited by JMF on Sun Oct 28, 2012 7:11 pm, edited 1 time in total.

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 Post subject: Re: Hydro Foil almost done
PostPosted: Sun Oct 28, 2012 6:52 pm 
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Cool Video!!

It a great coincidence, our fuselage is also 76cm :-)

If you want to stay up to date, we have a Facebook page dedicated to the Foil project at Magma.

http://www.facebook.com/MagmaSurfandFoiHydrofoils

Also here is a Sequence of a Carve on the new Foil from today :-)

Attachment:
Hydro v6 collage 2.jpg
Hydro v6 collage 2.jpg [ 2.24 MIB | Viewed 842 times ]


--
Gunnar


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