*


All times are UTC + 1 hour



Post new topic Reply to topic
 [ 14 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: First board - need help
PostPosted: Mon Feb 27, 2012 3:50 pm 
Offline
Rare Poster

Joined: Sun Jan 29, 2012 1:42 pm
Posts: 16
Hello everyone. Yesterday I finished the rocker table. I'd like to create my first board, but I have a few concerns. First is about the rocker and concave. Board size is 140X45cm. I was planning 7mm concave and 2.7 cm of rocker at the tips (Is that enough). Should I go with a continuous rocker or center to leave flat? I would chose this second option, but I do not know how much of flat surface to leave, and where to start to bend the rocker?The other thing is the core thickness, 6mm thick plywood laminated with glass and epoxy, with carbon reinforcement. Is this too thin???

(P.S. Sorry for bad english)


Attachments:
File comment: Rocker table
SAM_0680.JPG
SAM_0680.JPG [ 5.71 MIB | Viewed 1819 times ]
{ SHARE_ON_FACEBOOK } { SHARE_ON_TWITTER } { SHARE_ON_ORKUT } { SHARE_ON_DIGG } { SHARE_ON_MYSPACE } { SHARE_ON_DELICIOUS }
Top
Profile
 Post subject: Re: First board - need help
PostPosted: Mon Feb 27, 2012 10:56 pm 
Offline
Frequent Poster
User avatar

Joined: Mon Jul 26, 2004 6:50 pm
Posts: 455
Location: Wolfe Island Canada
I would stick with the continuous rocker for sure. 2.7cm is a good value for a lightwind board. You may want to increase that a bit but depending on your conditions 2.7 will be fine. Make sure your core does not spring back flatter from that though or it will be too flat for sure.

Stan


Top
Profile
 Post subject: Re: First board - need help
PostPosted: Tue Feb 28, 2012 12:50 am 
Offline
Very Frequent Poster

Joined: Mon Oct 08, 2007 4:39 am
Posts: 544
If put the concave in just the center and none in the tips you get a bit of flat in the center and the continuous rocker at the rail. Best of both worlds.


Top
Profile
 Post subject: Re: First board - need help
PostPosted: Tue Feb 28, 2012 9:05 am 
Offline
Frequent Poster
User avatar

Joined: Tue Feb 24, 2009 1:43 pm
Posts: 305
Location: Iv.G.-Slovenia
gbleck wrote:
If put the concave in just the center and none in the tips you get a bit of flat in the center and the continuous rocker at the rail. Best of both worlds.

Concave is a bitch. If you do it wrong, it will create vacuum and the board will be pulled off your feet when jumping.


Top
Profile
 Post subject: Re: First board - need help
PostPosted: Tue Feb 28, 2012 11:19 pm 
Offline
Rare Poster

Joined: Sun Jan 29, 2012 1:42 pm
Posts: 16
zob wrote:
gbleck wrote:
If put the concave in just the center and none in the tips you get a bit of flat in the center and the continuous rocker at the rail. Best of both worlds.

Concave is a bitch. If you do it wrong, it will create vacuum and the board will be pulled off your feet when jumping.


Thank you for your replies. For what I need to be careful to do a right concave? And is it enough core thickness 6mm?


Top
Profile
 Post subject: Re: First board - need help
PostPosted: Tue Feb 28, 2012 11:45 pm 
Offline
Frequent Poster
User avatar

Joined: Tue Jan 02, 2007 11:50 pm
Posts: 262
Location: Ottawa, Canada
Sorry, I don't know about core thicknesses on wood core boards. But, I've never heard of this theory with concave and vacuum pulling your board off. I can't even imagine how that would happen, the board is cutting through the water, it is not acting like a flat suction cup.

Peter


Top
Profile
 Post subject: Re: First board - need help
PostPosted: Wed Feb 29, 2012 8:50 am 
Offline
Frequent Poster
User avatar

Joined: Tue Feb 24, 2009 1:43 pm
Posts: 305
Location: Iv.G.-Slovenia
foam-n-fibre wrote:
But, I've never heard of this theory with concave and vacuum pulling your board off. I can't even imagine how that would happen, the board is cutting through the water, it is not acting like a flat suction cup.


With my initial rocker table design, I got out a board with pretty flat rocker in the middle, with bigger progression in the last quarter of the board. That's probably because of the concave shape. It was very wide in the center and finished around the place where the tip rocker started to progress. Depth was 4 mm. There was little transition from flat bottom to concave. When the board was lying down it seated flat on the concave edge.
So if the board was lying on the flat water it took a lot of force to lift her by the handle, so it was acting like a suction cup. This also showed when jumping, specially in low wind, when you pop less and the board lies flatter on the water surface.


Top
Profile
 Post subject: Re: First board - need help
PostPosted: Wed Mar 21, 2012 1:06 am 
Offline
Rare Poster

Joined: Wed Jul 28, 2010 1:29 am
Posts: 37
Mike I like people who make there own boards so here is my advice: make the board flat it will be the simplest way then one inch rocker with continious curve and twin tips need very little volume and if the board is total wood then glass will not be needed just seal the board with a thin coat of epoxy sand and finish with a good coat of epoxy. I build these exact boards in California and that is how I do it. I also build surf boards and race boards with them I use foam for the core. hope this helps.


Top
Profile
 Post subject: Re: First board - need help
PostPosted: Thu Mar 22, 2012 5:52 pm 
Offline
Rare Poster

Joined: Tue Feb 07, 2012 8:56 pm
Posts: 26
If you dont want to jump you could really build a wooden board ~20 mm thickness. It will definitely soak up water and the initial weight will increase from 3kg to 5kg...
There is a trick. Try to make a bottom from 4mm plywood and 15mm wood strips on top. Glue it on 5 cm continuous rocker table without concave. After a one season in the water you will have 10mm concave.
It would be soft and confortable board for freeride.
I would not recommend to use plywood as core material. It is heavy.
You will not be able to form a concave. Try to form rocker and concave from a sheet of paper and you will see.
Use wood strips or foam instead.


Top
Profile
 Post subject: Re: First board - need help
PostPosted: Mon Mar 26, 2012 9:44 pm 
Offline
Rare Poster

Joined: Sun Jan 29, 2012 1:42 pm
Posts: 16
Thank you all for your replies. But now when I have rocker table and vacuum pump, I must do a little experimenting with concave and rocker. I decided to make a big light wind board 165X50, something like Spleene monster door. Does the Spleene door have rocker and concave???


Attachments:
M DOOR Final net.jpg
M DOOR Final net.jpg [ 338.42 KIB | Viewed 1375 times ]
Top
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic
 [ 14 posts ]  Go to page 1, 2  Next

All times are UTC + 1 hour


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group