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The Backyard HP wooden paddle experiment - Cont.

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Created by CMC > 9 months ago, 23 Feb 2011
CMC
QLD, 3954 posts
23 Feb 2011 12:12PM
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Some of you may remember many moons ago I started an experimental paddle for my mate Dan. The paddle was made with Pauwlonia and Balsa and the experiment was to be make a paddle from wood that was extremely light but still strong. I decided to use uni directional carbon tape on the underside and blade to strengthen and stiffen it. Without this the balsa made the whole thing a little too flexy.

Anyway I gave it to Dan to finish off and the paddle just sat there for months doing nothing. Making paddles over Christmas when you have people waiting for surfboards is a problem apparently. hahah.

SO, I took it back again and it is almost finished.

Just to recap, I have added the pics as below to show the progress back from the beginning.

I have final sanded and filler coated now so will probably be complete today.

Here is where we're at today: Only bottom as resin is still going off and can not flip for a little while.







And before:














CMC
QLD, 3954 posts
23 Feb 2011 5:59PM
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Had issues, applied more filler coat. Currently going off.

Will sand and start weight and flex tests tomorrow. Feels nice and light and with my C4 in my other hand very similar in weight. For the purpose of this test I will compare it to a full carbon C4 paddle as that is all I have to compare it with.

Flex feels nice. Looking forward to using it.

Ted the Kiwi
NSW, 14256 posts
24 Feb 2011 2:26AM
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looks good CMC. Nice work. Looking forward to the progress reports.

Simondo
VIC, 8020 posts
24 Feb 2011 3:13PM
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Well done, keep us posted.

Minkee
QLD, 225 posts
24 Feb 2011 11:10PM
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Nice :)
But not convinced about the unidirectional for the shaft, it sure looks good but is it safe enough?

CMC
QLD, 3954 posts
25 Feb 2011 9:01AM
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Minkee said...

Nice :)
But not convinced about the unidirectional for the shaft, it sure looks good but is it safe enough?


Not sure what you mean about safe Minkee. The aim of the game was to make a light paddle with the feel of wood that had nice properties in flex etc. If you mean strength this paddle is laminated with epoxy resin with two layers of Innegra polypropylene fabric into the 7 layer of timber lamination. I then added the carbon Uni (inside a 4 oz fibreglass weave) to the outside to add stiffness and keep it light. I have put my whole body weight onto the paddle on the ground and it does flex and did not snap or even crack or groan. You do not put this much pressure on a paddle while paddling.

In other sports wooden paddles still reign supreme, wood has a nice flex feel. Some companies make Carbon/Kevlar to add some flex to the stiff carbon shafts that can be hard on your body. Kialoa and QB seem to have greater flex in their shafts that I really like though.

The paddle is finished now, I will put up some pics later on and will do some flex tests with a ruler and weights to show the difference in flex between carbon/carbon kevlar and this paddle. My initial reaction without paddling it would be that I would prefer it to be stiffer. This could be achieved by adding solid carbon tape into the lamination or the outside. Only paddling with it will really tell though.

Bottom line is that I just like to play with stuff. It's fun.

Minkee
QLD, 225 posts
25 Feb 2011 10:16AM
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If you mean strength this paddle is laminated with epoxy resin with two layers of Innegra polypropylene fabric into the 7 layer of timber lamination.


With that info I'm sure it will be fine :)
I use Innegra too for a different application and it's a very good subsitute to carbon.

It wasnt clear beforehand how the shaft was made although looking at the pictures again illustrates your words pretty well. While I appreciate it's mainly used in flexion there's always the risk of the odd accident where the paddle twist or whatever. It's always good to build a bit of safety margin so a product doesnt get destoyed in a freak accident; that's what I had in mind.

CMC
QLD, 3954 posts
25 Feb 2011 9:00PM
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OK, here is the pics of the finished product.

Had a bit to do so have not done the weight flex test or the real actually paddle with it test yet.

Cosmetically though it looks unreal. I took it to the OC club and had a few people ask to order OC paddles that looked the same (but shorter).

It feels light, even more so 'cos you expect wood to have weight. It is exactly the same weight as a full carbon C4 paddle which shocked me to be honest.

Here are some pics of the finished product and the scales to prove its weight.

SandS
VIC, 5904 posts
25 Feb 2011 10:28PM
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looks like a lovely piece of art , hats off to you



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