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wooden paipo weight & wood selection

 
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bgreen



Joined: 20 Feb 2004
Posts:
Location: Qld. Oz

PostPosted: Thu May 31, 2007 5:03 pm    Post subject: wooden paipo weight & wood selection Reply with quote

Hello,

I came across an old (probably 70 years or so) skirting board of what I think is Australian cedar under the house. For its length (about 10 feet x 5" x 1.5" thick) it is light - much lighter than a smaller pine floorboard also under the house. I was toying with whether I could make a workable paipo board from it.

My questions:

1. what would be a reasonable weight for a board about 5' x 1" thick?

2. If I wanted to add some balsa (partly because I am not sure whether the board would be light enough and I doubt I have enough wood) - would it be better to alternate the pieces of wood, put the harder wood on the rails or some other combination?

I could always throw the wood into the surf and see if it sinks but this this is not too convenient at present.

Any suggestions are welcomed,

Bob
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PaipoJim
Director of CTU


Joined: 31 May 2004
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Location: Oregon

PostPosted: Fri Jun 01, 2007 12:17 pm    Post subject: Reply with quote

Slice off a small piece and see if it floats in the kitchen sink.
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bgreen



Joined: 20 Feb 2004
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Location: Qld. Oz

PostPosted: Fri Jun 01, 2007 4:49 pm    Post subject: wooden paipo weight & wood selection Reply with quote

Jim,

Out of curiosity I tried slivers of 5 types of wood. The only failure, which floated for a little while was the hardwood chamferboard. If there is a major flood I now know that I can't count on the house floating.

The other wood that I took pieces from & that floated were:

1. an aged hardwood step tread
2. a new hardwood signpost
3. a pine floorboard
4. the piece of cedar skirting board


Bob
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PaipoJim
Director of CTU


Joined: 31 May 2004
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Location: Oregon

PostPosted: Fri Jun 01, 2007 5:38 pm    Post subject: Reply with quote

Here is a link to specific gravity numbers for some common woods:

http://www.engineeringtoolbox.com/wood-density-d_40.html

Disitilled water at 4°C is 1000kg/m³.
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Poobah
Dolphin Glider


Joined: 09 Jan 2004
Posts: 696
Location: California, San Diego

PostPosted: Fri Jun 01, 2007 11:07 pm    Post subject: Reply with quote

Maybe glue a cork deck on top of the plank bellyboard. It could increase your bouyancy, and give you a softer surface for your elbows and chest.
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bgreen



Joined: 20 Feb 2004
Posts:
Location: Qld. Oz

PostPosted: Mon Jun 04, 2007 4:58 pm    Post subject: wooden paipo weight & wood selection Reply with quote

Jim,

The link to the specific gravity of wood was useful. After balsa, the next lightest woods are in the 300s which includes cedar.

Poobah,

I was thinking of oiling the board. I can't imagine this would work with cork. Would you seal cork with some synthetic finish like used on floor tiles?

Bob
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Poobah
Dolphin Glider


Joined: 09 Jan 2004
Posts: 696
Location: California, San Diego

PostPosted: Tue Jun 05, 2007 1:25 pm    Post subject: Reply with quote

I said maybe, because I haven't tried it myself. It's been on my list of things to do. Somewhere on the net, I once read that early paddleboards were made of solid cork scavenged from dock floats. I don't recall if they even bothered to seal them. Cork (bark) is a different structure than the woody part of the tree. Fluid can't flow (quickly) through the cork in a wine bottle, so I figure it would be fairly waterproof as a deck material. My only concern would be fungus and mold. If you use an oil finish meant for boat use, then it probably already contains a fungicide. I did a quick search on cork floor sealers, and saw one that was parrafin-oil based. I say stick with the products that are intended for exterior use. I think I'll give cork a try this weekend. It's been on my list long enough.
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bgreen



Joined: 20 Feb 2004
Posts:
Location: Qld. Oz

PostPosted: Tue Jun 05, 2007 3:42 pm    Post subject: wooden paipo weight & wood selection Reply with quote

Poobah,

Have you a board you intend to glue cork on the deck of, or are you starting from scratch? There is the also question of the best glue for such a job.

I look forward to hearing how it works out.


Bob
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Poobah
Dolphin Glider


Joined: 09 Jan 2004
Posts: 696
Location: California, San Diego

PostPosted: Sat Jun 23, 2007 12:19 am    Post subject: Re: wooden paipo weight & wood selection Reply with quote

bgreen wrote:
Poobah,

Have you a board you intend to glue cork on the deck of, or are you starting from scratch? There is the also question of the best glue for such a job.
I look forward to hearing how it works out.
Bob


I want to do both. Right now the contact cement is curing on the first board. It took me a while to find a local supplier for the cork sheet. I think I'll start a new thread for cork boards. This here thread can return to the topic of wood selection, etc.
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