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the cheap, the bad, the ugly

A forum dedicated to Hydrofoil riders


ahmthai
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Re: the cheap, the bad, the ugly

Postby ahmthai » Tue Jun 24, 2014 9:10 am

Jaros, Your first day sounds like most people's first days. A production foil does not feel draggy, but you do get the sensation that something below is pulling the board around. Nothing can really prepare you for the first time the foil comes up. Most people take several days to any significant distance on the foil. It may take you much longer than that with your board.

Good luck,

revhed
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Re: the cheap, the bad, the ugly

Postby revhed » Tue Jun 24, 2014 10:17 am

lan sup cri sym center line.png
lan sup cri sym center line.png (8.28 KiB) Viewed 855 times

This can be a nice strut profile as it is more rectangle shaped thereby leaving more material.
It will never be as hydrodynamic as many other profiles but sure it will work just fine for a low speed learning kiteboardhydrofoil.
R H

zfennell
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Re: the cheap, the bad, the ugly

Postby zfennell » Tue Jun 24, 2014 1:30 pm

i like it.
despite any deficiencies, jaros does appear to address a few strucrural details that many of the purists ignore.

not for me to say how well it will work.
time will certainly tell.
we all seem to have a handle on what's better. But it may be harder to quantify what's good enough until you actually get there.

most likely folks like cory lunn would have some opinions
http://activedrift.blogspot.com/2008/11 ... -page.html

and
many would question the design integrity of Hawaiis home-made efforts.
But he is certainly the king of 'low tech' foils here.

i'm looking forward to see how thiings go.
-bill

jaros
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Re: the cheap, the bad, the ugly

Postby jaros » Tue Jun 24, 2014 10:34 pm

despite any deficiencies, jaros does appear to address a few structural details that many of the purists ignore.

I am not sure I know what you mean by that, but thanx if its a compliment! :D

many would question the design integrity of Hawaiis home-made efforts.
But he is certainly the king of 'low tech' foils here.

Hawaiis is my Idol! Until I saw his work I tought foils are something that can not be done at home. He proved that many things can fly no mather how low tech they appear. Thanx for that Hawaiis!
He does have one big advantage though - he knows how to ride a foil (if I am right he did learn on the bought one and not on a self made), and knows how to differ good and wrong creations under his feet.
Greetings,
Jaros
Last edited by jaros on Tue Jun 24, 2014 11:46 pm, edited 1 time in total.

zfennell
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Re: the cheap, the bad, the ugly

Postby zfennell » Tue Jun 24, 2014 11:08 pm

we all have our strengths and weakness.

in your case, the strut may be a bit suspect.
....possibly too soft and not strong enough.

hawaiis has lost one of his struts in the past due to faulty joint with board.
i believe rev head has snapped his fuselage where it joins with the strut.

its not likely your design will fail in either of those places.

they have both been generous in sharing their experience so that others may benefit.
but dont be afraid to put your own twist to the design.
you never really know until its done.

-bill

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Hawaiis
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Re: the cheap, the bad, the ugly

Postby Hawaiis » Wed Jun 25, 2014 12:13 am

zfennell wrote:we all have our strengths and weakness.

in your case, the strut may be a bit suspect.
....possibly too soft and not strong enough.

hawaiis has lost one of his struts in the past due to faulty joint with board.
i believe rev head has snapped his fuselage where it joins with the strut.

its not likely your design will fail in either of those places.

they have both been generous in sharing their experience so that others may benefit.
but dont be afraid to put your own twist to the design.
you never really know until its done.

-bill

It was a removable joint between the strut and the fuselage, I have since moved up to permanent joints

revhed
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Re: the cheap, the bad, the ugly

Postby revhed » Wed Jun 25, 2014 7:39 am

zfennell wrote:in your case, the strut may be a bit suspect.
....possibly too soft and not strong enough.

hawaiis has lost one of his struts in the past due to faulty joint with board.


I believe rev head has snapped his fuselage where it joins with the strut.
before
P1010029.JPG

after
P1010001.JPG


-bill

This my favorite wing was never found

From these failers I now know that the High stress points are;
1) on the fuse between the T E of front wing and L E of strut
2) fuse to strut connection
3) strut to either base plate or tuttle box at borad
I see a trend for the distance between the f wing T E and strut L E to be less and have seen production protos doing this to reduce this huge lever force.
R H

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Hawaiis
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Re: the cheap, the bad, the ugly

Postby Hawaiis » Wed Jun 25, 2014 8:17 am

Carbon fiber is stiff, but too brittle. Carbon covered metal tube may be better.


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