Here you can exchange your experience and datas about your home build boards
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MFR
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Postby MFR » Mon Feb 01, 2016 8:06 am
Hi everyone
I'm in the process of building my first wakeboard. The board is shaped and ready for laying up on my rocker table. I am putting a 65mm continuous rocker, however the paulownia board feels fairly strong and I'm worried it won't flex that much under vacuum.
The board is 12mm thick in the centre with tip and tails fairing to 5mm over 10". The board is 1400mm in length and 430mm wide.
Does anyone have any advice on forming the rocker in paulownia or should it form under vacuum?
Kind regards
Matt
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BWD
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Postby BWD » Mon Feb 01, 2016 4:14 pm
Might want tips a mm or so thinner, but it should bend to the table under vacuum, especially if it's a good vacuum. The longer you keep it under vacuum (or otherwise clamped weighted etc) while laminate cures the better the rocker will hold. Like all day, and then some. A mm of creep in the laminate can lose you 20-30mm of rocker depending on shape.
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Bigdog
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Postby Bigdog » Mon Feb 01, 2016 4:22 pm
Where do you get the paulo? I'm in Canada and lightest local wood is cedar and its kinda heavy
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MFR
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Postby MFR » Mon Feb 01, 2016 6:02 pm
Thanks BWD
Bigdog - I used junk supply.com.
I'll be uploading some photos of the build this week
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BWD
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Postby BWD » Mon Feb 01, 2016 6:08 pm
You're quite welcome.
It should work fine, but a dry run with the vacuum never hurts to see how it will sit down on the table etc. Best luck and post up the results
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zob
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Postby zob » Mon Feb 01, 2016 8:27 pm
BWD wrote:dry run
My vote.
It comes down to how god is your vacum setup.
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downunder
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Postby downunder » Tue Feb 02, 2016 3:29 am
MFR,
I think you
will get a huge springback with 12mm deck. Think >60%. That means the rocker table needs >12cm.
Having said that it all depends on your top glassing. I do not glass it much, like 200g FG Uni. If you slap carbon, UD, triax, biax, or whatever, for sure you'll get different results with a springback.
This is 8.5cm table rocker with 3.5cm board rocker as a result:
viewtopic.php?f=107&t=2390040
Good luck.
D.
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MFR
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Postby MFR » Tue Feb 02, 2016 11:33 am
BWD - I will do a dry test with my vacuum set up and post up the results.
downunder - Thank you for the warning I will look into that before I lay it up. My intention was to use a triaxle glass on both top and bottom. How can I work out the spring back on this?
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tkettlepoint
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Postby tkettlepoint » Tue Feb 02, 2016 3:51 pm
hard to work out the spring back ... comes down to trial and error. even foam and corecell will spring back some . then it comes down to a lot of factors of your wood. thickness, moisture content , etc
terrie
www.jellyfishboards.com
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Postby rynhardt » Tue Feb 02, 2016 4:26 pm
If you don't want to deal with the spring back, could you not make the core more bendy?
Maybe cut some horizontal grooves to allow the core to flex? Like they do when forming curved wooden furniture.
Sure it'll be a bit heavier, since the resin will fill up the space.
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