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 Post subject: To vent or not to vent a kite board for hydrofoiling?
PostPosted: Mon Mar 10, 2014 1:06 pm 
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Joined: Sun Feb 24, 2008 6:15 pm
Posts: 202
Location: France
Hello,
I think I read here somewhere that a board builder recommends installing a "vent plug"
in boards. I did a search but did not find?
If you have info about this please share ideas and products, explanations.
I have a board that no matter how much I try to dry it out, off season, it always seems to open up again and bleed salt h2o. As it is airex core I don't worry to much but I have another with cheap strofoam? core and would like it to last.
Is this vent plug like a one way valve of some sort?
Thanx R H


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 Post subject: Re: To vent or not to vent a kite board for hydrofoiling?
PostPosted: Mon Mar 10, 2014 1:48 pm 
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Joined: Wed Nov 20, 2002 1:00 am
Posts: 911
Location: rhode island
hi,
the purpose of the vent is to prevent excessive expansion/contraction of the air inside your board.
hollow boards and those made with low density foam ( <2 lb/ft^3) can easily expand/deform with small changes in the pressure difference across the skin.

typical causes: the unpressurized cargo bay of a commercial airline or trunk of your car on a sunny day. also cheap XPS cores with poor bond strength to the skin

the vent is not intended to be a drain plug for leaks from other places in the skin.
but if you have a leak you intend to repair AND the internal structure of your board will allow ait to pass thru the core ..then why not use it?

once the skin expands regardless of the reason, delam from the core is likely and things go downhill from there.


i believe solid cores strong enough to be used for kite-boards do not need vents.
but sandwich skins on low density eps cores may find them useful.
pink XPS cores could use them but there is no way for the air to migrate thru the board.

regards,
-bill


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 Post subject: Re: To vent or not to vent a kite board for hydrofoiling?
PostPosted: Mon Mar 10, 2014 2:15 pm 
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Joined: Sun Jul 24, 2005 6:39 pm
Posts: 2991
This is a maintenance-free version of a vent plug. Uses a Goretex membrane, so air can get in and out but water can't.

http://www.standupzone.com/forum/index. ... ic=15918.0


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 Post subject: Re: To vent or not to vent a kite board for hydrofoiling?
PostPosted: Mon Mar 10, 2014 5:18 pm 
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Joined: Sun Feb 24, 2008 6:15 pm
Posts: 202
Location: France
Thanx for info guys,
Wow 30 usd for gortex vent plug, but it looks good!
R H


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 Post subject: Re: To vent or not to vent a kite board for hydrofoiling?
PostPosted: Mon Mar 10, 2014 5:34 pm 
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Joined: Sun Feb 12, 2006 8:16 pm
Posts: 385
Location: Kettle Point Ontario Canada
rev do it brother. the board will last that much longer. my sup will whistle when I pull the screw out of it for 30+ sec


terrie


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 Post subject: Re: To vent or not to vent a kite board for hydrofoiling?
PostPosted: Mon Mar 10, 2014 5:43 pm 
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Joined: Fri Dec 20, 2013 8:49 pm
Posts: 116
You might be referring to the attached post


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 Post subject: Re: To vent or not to vent a kite board for hydrofoiling?
PostPosted: Mon Mar 10, 2014 6:05 pm 
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Joined: Sun Feb 24, 2008 6:15 pm
Posts: 202
Location: France
HUGE thanx Terry, tkettlepoint and Randahl! :D
Yes this was what I saw, you guys are the best, I will do makes perfect sense! :!:
Again, super cool!!
R H


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 Post subject: Re: To vent or not to vent a kite board for hydrofoiling?
PostPosted: Mon Mar 10, 2014 11:00 pm 
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Joined: Sun Feb 12, 2006 8:16 pm
Posts: 385
Location: Kettle Point Ontario Canada
no worries... just like to help out.. I have seen a Production SUP with a vent plug in it bubble for hours when I did a 3 hour paddle last summer that was well in the water.

To me it is just insurance so your board doesn't delam before it's time

terrie
jellyfishboards.com
"chasing my dreams one letter at a time"


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 Post subject: Re: To vent or not to vent a kite board for hydrofoiling?
PostPosted: Tue Mar 11, 2014 10:30 am 
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Joined: Tue Dec 23, 2003 2:34 pm
Posts: 1461
Temavento boards don't have a vent.

I remember Jimmy saying something about the skin being thick enough and strong enough it wasn't needed.

regards

Tony


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 Post subject: Re: To vent or not to vent a kite board for hydrofoiling?
PostPosted: Tue Mar 11, 2014 11:35 am 
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Joined: Sun Feb 12, 2006 8:16 pm
Posts: 385
Location: Kettle Point Ontario Canada
http://www.greenlightsurfsupply.com/ven ... -V314.aspx
14 usd each.

if a board is layed on the beach or in a car long enough there will be a large amount of pressure inside of it... If the glass is that thick you will loose feel of the board. ( won't feel like a surfboard) Yes we can make anything a person wants but I just think that for 14 dollars that is cheep insurance so the board won't crack. The thicker the board the more pressure it will make.

The first place that it will crack is around inserts or fin boxes, just a hair line crack. And then water slowly seeps in and delam happens over time... think of a zip lock bag with zipped shut and tossed on the ground in the sun for the day. what happens? it inflates and condensation happens inside. Well if a board can not breath what is going to happen. It is a sealed shell .

just my 2 cents and I will put them in

Terrie
www.jellyfishboards.com
"chasing my dreams one letter at a time"


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