Contact   Imprint   Advertising   Guidelines

Foam core board build and a question for the next step

here you can exchange your experience and datas about your home build boards


TomW
Very Frequent Poster
Posts: 1835
Joined: Wed Oct 05, 2005 6:43 pm
Kiting since: 2001
Local Beach: Vejbystrand
Gear: Homemade 4-1
North Mono 7 & 12
RRD Obsession 9
Core XR3 12m
Brand Affiliation: None
Location: Sweden

Re: Foam core board build and a question for the next step

Postby TomW » Tue Aug 23, 2016 7:56 pm

I think you need to taper or thin down the foam more gradually.

jcres
Rare Poster
Posts: 12
Joined: Thu May 19, 2016 8:25 pm
Kiting since: 2013
Gear: RRD kites and boards
Brand Affiliation: None

Re: Foam core board build and a question for the next step

Postby jcres » Mon Aug 29, 2016 7:05 am

downunder wrote:Heh, if you posted this earlier I was working in Helsinki and would bring it to ya :)

The product is named Duraclear and manufactured in France by socrep.com

Other product is made in Austria by isosport, and this is a TPU sold via junksupply as I understand.

Either way, it is a bugger to apply on the board without a press...
That's funny coincidence that you were in Helsinki where I live. Small world. :)

I only have vacuum for pressing power, so I think that I have to find alternatives to that if that is not enough. I just got two printable sample fabrics from a print shop that I laminated under vacuum yesterday. I should see today how they turned out. The other sample is some flag material and the other feels about the same but is heavier and you cannot see through so easily. But do they bond well with epoxy remains to be seen later today.

jcres
Rare Poster
Posts: 12
Joined: Thu May 19, 2016 8:25 pm
Kiting since: 2013
Gear: RRD kites and boards
Brand Affiliation: None

Re: Foam core board build and a question for the next step

Postby jcres » Mon Aug 29, 2016 7:08 am

TomW wrote:I think you need to taper or thin down the foam more gradually.
I think so too. I already did one core same way as earlier and will extend the UD carbon more to the tip to see if that works. For future boards I will then follow your suggestion.

User avatar
Rufusz
Frequent Poster
Posts: 224
Joined: Sun May 06, 2012 10:06 pm
Kiting since: 2010
Local Beach: Lake Balaton, Hungary
Favorite Beaches: Hurghada, Egypt
Viganj, Croatia
El Médano, Tenerife
Style: Foil, Freeride
Gear: Kitech 6m2, 9m2, 15m2 foil kites
Moses Fluente
Flysurfer radical4
Brand Affiliation: None

Re: Foam core board build and a question for the next step

Postby Rufusz » Mon Aug 29, 2016 11:59 am

jcres wrote:...
I only have vacuum for pressing power, so I think that I have to find alternatives to that if that is not enough.
Proper vacuum (90%++) gives you the pressure equivalent of tons of weight over the board surface. A simple fridge compressor is capable of that levels of vacuum. Invest in a vacuum gauge to get to the proper vacuum levels and perhaps a buffer tank to have some vacuum advance.
Vacuum bagging gives you more than enough pressure for proper lamination, bending foam and wood cores, etc.

edit: Did you use peel ply and breather material for the vac bagging? It helps a lot with even vacuum distribution along with the spiral hose to help the extraction of excess resin.

User avatar
downunder
Very Frequent Poster
Posts: 1093
Joined: Mon Jul 01, 2013 7:16 am
Kiting since: 1970
Gear: building my own
Brand Affiliation: None
Location: Perth, Australia

Re: Foam core board build and a question for the next step

Postby downunder » Wed Aug 31, 2016 3:02 am

Vacuum won't help with applying a topsheet on top/bottom, unfortunately. Been there...

Quite decent results with topsheet are done by Zob and he is using a mechanical press:

viewtopic.php?f=107&t=2387034&start=10

If one really needs a topsheet, the trick would be to apply heaps of epoxy, bath a board in it, wait to gel and than slowly apply a topsheet. than a vac. A 'master' technique of applying tint films would help here significantly(*).

Just a few days ago I tried to apply mylar sheet on my foil mast and couldn't avoid many air bubbles underneath (see *). And this is a way smaller surface than a board.

Very rarely you'll see the production boards with clear topsheet. I've seen some with heaps of air bubbles and dry spots...

I also contemplated the idea of applying a nice Formica design http://en.wikipedia.org/wiki/Formica_(plastic).
Kaito (memberlist.php?mode=viewprofile&u=858), says Formica does work, and I do know one DYI board used for number of years with white Formica.

But, it's not cheap for me. One sheet is about $150 and can use it for only one board, maybe two small ones.

jcres
Rare Poster
Posts: 12
Joined: Thu May 19, 2016 8:25 pm
Kiting since: 2013
Gear: RRD kites and boards
Brand Affiliation: None

Re: Foam core board build and a question for the next step

Postby jcres » Thu Oct 20, 2016 7:00 pm

I am now testing two different materials. Top is fabric called decotex and bottom is vinyl sticker with protecting transparent laminate. Decotex bonded well with the epoxy but I am not satisfied with the result. It has some uneven spots. Let's see how they last.
Attachments
IMG_3444.JPG
IMG_3443.JPG

jcres
Rare Poster
Posts: 12
Joined: Thu May 19, 2016 8:25 pm
Kiting since: 2013
Gear: RRD kites and boards
Brand Affiliation: None

Re: Foam core board build and a question for the next step

Postby jcres » Thu Oct 20, 2016 7:03 pm

Rufusz wrote:Did you use peel ply and breather material for the vac bagging? It helps a lot with even vacuum distribution along with the spiral hose to help the extraction of excess resin.
I had perforated film and breather material. I did not use infusion method, so no spiral line.

kitcho207
Rare Poster
Posts: 25
Joined: Mon Nov 10, 2014 9:38 pm
Kiting since: 2008
Local Beach: Warilla,
Style: Freestyle, Freeride, Surf
Gear: 2014 CORE GTS2's
Shinn monk
Cabrinha plasma
My carbon custom

Re: Foam core board build and a question for the next step

Postby kitcho207 » Sat Nov 26, 2016 11:38 pm

Looks great. How does it ride? How thick are your tips?
What did the board weigh with the graphics (bare board)

kitcho207
Rare Poster
Posts: 25
Joined: Mon Nov 10, 2014 9:38 pm
Kiting since: 2008
Local Beach: Warilla,
Style: Freestyle, Freeride, Surf
Gear: 2014 CORE GTS2's
Shinn monk
Cabrinha plasma
My carbon custom

Re: Foam core board build and a question for the next step

Postby kitcho207 » Sun Nov 27, 2016 1:11 am

I have been looking for ages for large mylar sheet with no luck. The film i currently use is really static and attracts unwanted particles.

plummet
Very Frequent Poster
Posts: 5576
Joined: Sat Aug 29, 2009 11:25 pm
Kiting since: 33
Local Beach: God created the naki so the hardcore people would have a place to live.
Favorite Beaches: Shhhhhhhhhhhhh...........
Style: Always searching for flow!
Gear: If you take 3.1415 from opinion. You get onion!
Brand Affiliation: What do yo call an Alligator in a vest? ............... An Investigator.

Re: Foam core board build and a question for the next step

Postby plummet » Sun Nov 27, 2016 10:03 am

Looken slick


Return to “Board Builders”

Who is online

Users browsing this forum: No registered users and 4 guests