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Simple Plyboard

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


-KD-
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Local Beach: Yyteri in Finland
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Slingshot Rally 10m2
F-One Bandit 12m2
North Juice 15m2
Spleene RIP 35rs 135x42
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Simple Plyboard

Postby -KD- » Mon Mar 20, 2017 12:18 pm

Hey all,

I have read great posts from this forum for quite a while, and now I'm posting for first time, so thank you already from great ideas.

I have been thinking of making my first simple plywood board and I hope that I would get some tips before I start making it. My most concerns are typical: size, flex, rocker and weight. Luckily I have one plywood board already which I got as a bargain when I bought one of my kites. At the moment that is my lightwind board and I love that when my factory made boards are not enough I can still go with my plyboard.


So...
I want to replace my plywood board with two new ones. I want one board for me to do jumps and later one for even lower wind (plydoor).

So my first consernes are:

Q1:
What I have understood, people usually uses 4-6mm of ply. Is there a reason why not to use even thinner plywood, I'm thinking of 2-3mm of ply. I think it would be easier to do rocker with more layers.

Q2:
How to finish the plyboards, I want to go with the easiest way because these are my first boards that I'm gonna make.

Q3:
The size, I know there is no right answer to this but I found this post from other forum and I would like some comments for this. I would like the idea of kind of short and wide board:
Dunno about those boards. I had a custom made by Cardboards some years ago and it rips in light winds and is ok in stronger winds (but a little bit skatey when the wind gets up).

135x48cm. Moderately stiff. Minimal rocker. Straps on the centre line, minimal fins.

You want planing area under your feet where it counts.
Avoid rocker. Rocker is slow and sucks power.
Avoid length and flex. A long board flexes and that makes rocker and rocker is slow.
Avoid too much finnage. Fins create drag and drag is slow....
Avoid offsetting the straps to the heel side. That edges too much. Creates drag and imbalance. Slow...
(Post by user Gorgo at https://www.seabreeze.com.au/forums/Kit ... -tip-board)

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rynhardt
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Re: Simple Plyboard

Postby rynhardt » Mon Mar 20, 2017 6:23 pm

I just finished a plywood wakeskate recently. Construction principles should be the same. I used 4mm marine ply, coz it was easy to source. Thinner ply will probably work better.

Built a rocker table and laminated the plies together with clamps and old batteries as weights. I did one ply per evening.

Cut out the shape, beveled the edges and sealed the bottom with marine varnish. Put some rubber flooring on top. Fun project!

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rynhardt
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Cloud C2 17
Progeni Mutare
Xelerator door
Hoff DD140
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Re: Simple Plyboard

Postby rynhardt » Mon Mar 20, 2017 6:26 pm

Some pics..
Attachments
DSC_0065.JPG
DSC_0182.JPG
DSC_0183.JPG

faklord
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Re: Simple Plyboard

Postby faklord » Mon Mar 20, 2017 7:37 pm

Thats a lot of old Batteries! where did they all come from?
Before I started Vac bagging I used to use bags of sand and gravel rather than solid weights, in the belief that they would spread the load better.
But when you realise a bit of polythene sheet and a vac pump gives you the equivanent to ~5000kg (for a 140 x 40cm board), or 200x25kg bags of stuff, that seems a better way to go!

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rynhardt
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Joined: Wed Sep 11, 2013 3:51 pm
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Local Beach: Leeupan
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Style: Freeride
Gear: GK vSonic 6 & 11
Cloud C2 17
Progeni Mutare
Xelerator door
Hoff DD140
Brand Affiliation: None
Location: Johannesburg, South Africa

Re: Simple Plyboard

Postby rynhardt » Mon Mar 20, 2017 8:41 pm

Old UPS batteries. And one old car battery. Vacuum would have been better, but the weights seemed easier at the time. It was all kinda done on a whim.

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downunder
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Re: Simple Plyboard

Postby downunder » Tue Mar 21, 2017 3:41 am

Welcome Suomi reader!

Minä rakastan Suomea!

Gorgo is funny...I've got bad knees, what am I supposed to ride, a concrete block? :) Bigger the fins, bites better, bites better = faster. And it goes on...

A1: I do not use ply any more. Because it has voids inside the ply which are not visible when buying. Than you hit the void ie. when drilling for footpads inserts.

Bending strength comes from the 'core' thickness. Cubed. (https://en.wikipedia.org/wiki/Flexural_modulus)
so having 6mm ply is 216, but 8m is 512 (if width equal, ie 12mm). So only 2mm difference in wood (cheap), is enormous difference in result.

A2: Easiest would be with a spray gun. But that requires a compressor, etc.

A3: The question is: what is your weight, height and environment you ride in.

-KD-
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Posts: 4
Joined: Mon Mar 20, 2017 9:32 am
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Local Beach: Yyteri in Finland
Favorite Beaches: Kos, Psalidi
Style: freestyle
Gear: Core 7m2
Slingshot Rally 10m2
F-One Bandit 12m2
North Juice 15m2
Spleene RIP 35rs 135x42
Liquid Force Focus 138x41
DIY Ply 145x42,5
Brand Affiliation: None

Re: Simple Plyboard

Postby -KD- » Tue Mar 21, 2017 6:35 pm

downunder wrote:
Tue Mar 21, 2017 3:41 am
Welcome Suomi reader!

Minä rakastan Suomea!

Gorgo is funny...I've got bad knees, what am I supposed to ride, a concrete block? :) Bigger the fins, bites better, bites better = faster. And it goes on...

A1: I do not use ply any more. Because it has voids inside the ply which are not visible when buying. Than you hit the void ie. when drilling for footpads inserts.

Bending strength comes from the 'core' thickness. Cubed. (https://en.wikipedia.org/wiki/Flexural_modulus)
so having 6mm ply is 216, but 8m is 512 (if width equal, ie 12mm). So only 2mm difference in wood (cheap), is enormous difference in result.

A2: Easiest would be with a spray gun. But that requires a compressor, etc.

A3: The question is: what is your weight, height and environment you ride in.


Thank you for your kind words about Finland,

If you don't use ply anymoor, what do you use?

I'm around 83kg and 179cm, and I am usually riding in finland, here is quite small waves, various winds and cold water :(. But I am gonna go to work in Sydney for some time at the end of this year.

-KD-
Rare Poster
Posts: 4
Joined: Mon Mar 20, 2017 9:32 am
Kiting since: 0
Local Beach: Yyteri in Finland
Favorite Beaches: Kos, Psalidi
Style: freestyle
Gear: Core 7m2
Slingshot Rally 10m2
F-One Bandit 12m2
North Juice 15m2
Spleene RIP 35rs 135x42
Liquid Force Focus 138x41
DIY Ply 145x42,5
Brand Affiliation: None

Re: Simple Plyboard

Postby -KD- » Tue Mar 21, 2017 6:42 pm

Has someone tried boards like these: http://www.hawaiiankiteboards.com/Boards/

They have huge concave and are short, lightwind board is only 99cm

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downunder
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Re: Simple Plyboard

Postby downunder » Wed Mar 22, 2017 1:52 am

Ha ha, you come to Syd and I'll go to Helsinki any time :) Did that, done. Kiitos.

My FS Radical 4 has no concave, and it's 126/38cm. It has a channel and only on a heel side. Very comfortable board in choppy water. 5cm fins. I just got it last week. The other one is 120/39cm I'm riding 99% of my time.

People in general do not ride small boards, and it's difficult to judge by watching video how one board would work for *you*. Build it, it's a simple build that and you'll know!

Some of my builds are on this forum, look for "My New Year build".

-KD-
Rare Poster
Posts: 4
Joined: Mon Mar 20, 2017 9:32 am
Kiting since: 0
Local Beach: Yyteri in Finland
Favorite Beaches: Kos, Psalidi
Style: freestyle
Gear: Core 7m2
Slingshot Rally 10m2
F-One Bandit 12m2
North Juice 15m2
Spleene RIP 35rs 135x42
Liquid Force Focus 138x41
DIY Ply 145x42,5
Brand Affiliation: None

Re: Simple Plyboard

Postby -KD- » Wed Mar 22, 2017 9:05 pm

downunder wrote:
Wed Mar 22, 2017 1:52 am
Ha ha, you come to Syd and I'll go to Helsinki any time :) Did that, done. Kiitos.

My FS Radical 4 has no concave, and it's 126/38cm. It has a channel and only on a heel side. Very comfortable board in choppy water. 5cm fins. I just got it last week. The other one is 120/39cm I'm riding 99% of my time.

People in general do not ride small boards, and it's difficult to judge by watching video how one board would work for *you*. Build it, it's a simple build that and you'll know!

Some of my builds are on this forum, look for "My New Year build".


Here is my boards and thoughts about them. I cannot understand how can you use so small boards? I would just sink or couldn't get upwind at all with so small boards or do I just kite in gustier conditions.


My boards (LxW / measured rocker):

Slingshot Misfit 129 (129x28 / ~3,0):
This was my first board that I bought, I think everybody were using smaller boards then, this is too small board for me, I did use it for some time but I have bigger boards now so I don't use it anymore.

Spleene RIP 135rs 2010 (135x42 / ~3,2):
This is great board, I am surprised how low it goes compared the size, great allaround. My girlfriend usually uses this and I use it if wind is too low for my LQ focus, Awesome straps.

Liquid Force Focus 2015 (138x41 / ~4,0):
Great board for jumps, I love this board when the wind is enough, I'm thinking of changing Straps to boots, I think the straps which comes with the board sucks.

Handmade Plyboard (145x42,5 / ~2,7) got it as a bargain with one kite:
Simple plyboard, board we use for lightwinds, stiff as hell, small rocker, no channels no concave. Two layers of 7mm baltic birch. Feels sometimes skatey, easy to turn, I can go very low with this and my North Juice 15m2 and my girlfriend goes even when I can't because she's smaller.


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