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How to build a bar? Just the rod/pole item ~60cm. Anyone done it?

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TomW
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Re: How to build a bar? Just the rod/pole item ~60cm. Anyone done it?

Postby TomW » Wed Apr 04, 2018 5:42 pm

downunder wrote:
Wed Apr 04, 2018 7:08 am
TomW wrote:
Sat Mar 31, 2018 4:34 pm
.
.
Id Never sell this bar to anyone. It's strictly a personal project and I'll be using it foiling and never un hooking.

2018-03-31 16.13.21.jpg
2018-03-31 16.13.37.jpg

Sure, no need to sell tho:) I have access to the printer, can I get the files? :)
Pm me and I'll send the files. Need your email and file format you want. But it's really a no-brainer to model it in Cad. And the ends have to fit the tubes you have or can get.

TomW
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Re: How to build a bar? Just the rod/pole item ~60cm. Anyone done it?

Postby TomW » Sun Apr 08, 2018 7:31 pm

DSC_1041.JPG
I finished my frankenbar. 433 g total with 23M sk99 lines.
Now to test it in controlled conditions.

BWD
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Re: How to build a bar? Just the rod/pole item ~60cm. Anyone done it?

Postby BWD » Fri Apr 20, 2018 7:07 pm

Tom that bar looks great!
I have a suggestion for reinforcing the center (or any other part) against impact:
Overwrap with lower modulus fiber/fabric of your choice, perhaps in lower modulus matrix.
I think if I make a bar I might overwrap the whole thing with some kind of polyester cloth in a PU of lower hardness instead of epoxy.
Or for class and a weight penalty, leather it like a yacht wheel (or BRM)
I'd probably mold bar ends in CF/glass, with wide and narrow through passages for leaders.
I'm skeptical of skinny pipe style ends on the SK race bar, carbon or not, those little straws are just begging to be shut in a car door or something.
just my random thoughts...

TomW
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Re: How to build a bar? Just the rod/pole item ~60cm. Anyone done it?

Postby TomW » Fri Apr 20, 2018 10:08 pm

BWD,
I've not used the bar yet. I'm sceptical to use it as failure could be dangerous.
I researched online for failure testing and Switch was using 180 kg x 100 cycles. but, the used a wide webbing to transfer load.
I agree with your thoughts.

I'm going to put 180 kgs on it static, once I figure out a way to do it safely. If it doesn't break, I'll cycle it. I'm most concerned about the center.
The bar ends have the lines going through the carbon, so even if the ends break, it's still functional to get back.

I was looking at Core carbon bar. It has titanium strut in the middle.....

tomtom
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Re: How to build a bar? Just the rod/pole item ~60cm. Anyone done it?

Postby tomtom » Sat Apr 21, 2018 9:38 am

Do you unhook? If no just forget about. 180kg is margin for unhook tricks. Titanium strut in middle is textbook example of over engineering. I have bar breakage in past /2002 or so/.
Back lines goes slack - kite depower - no drama. Just rode it - if you break it make new one stronger. There is no chance to break one on hydrofoil imo.

All this is strictly for hook in riding.

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downunder
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Re: How to build a bar? Just the rod/pole item ~60cm. Anyone done it?

Postby downunder » Sat Apr 21, 2018 1:01 pm

I agree, dont overthink it.

It is just a bar. The line can snap, bladder explode etc. There is almost no pressure on a bar itself, well like 10kg or whatever.

To compare, I jump high with ultra thin race lines, did not snap yet. Bladder tho did.

Still waiting for the files :) the printer is ready, have free access!

TomW
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Re: How to build a bar? Just the rod/pole item ~60cm. Anyone done it?

Postby TomW » Sat Apr 21, 2018 7:24 pm

I started making it with the mindset that there can't be that much force on it.
Then I thought of the situation where I might get an unintentional centerline ( power line) release. Meaning the Cl will snap up at high force.
If that happens, it's going to fly out of my hands for sure onto the leash.

TomW
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Local Beach: Vejbystrand, Habo Ljung, Lomma
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TW Surfboards hydrofoil board 135
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Re: How to build a bar? Just the rod/pole item ~60cm. Anyone done it?

Postby TomW » Sat Apr 21, 2018 10:51 pm

Downunder. I thought I sent the files?
I did it from work. But I have them on Dropbox. Let me check again

Demy182
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Re: How to build a bar? Just the rod/pole item ~60cm. Anyone done it?

Postby Demy182 » Thu May 24, 2018 10:19 am

here's mine carbon bar with dyneema sk99 line
Attachments
Screenshot_20180426-171239.jpg

haare
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Re: How to build a bar? Just the rod/pole item ~60cm. Anyone done it?

Postby haare » Sat Jul 14, 2018 5:54 am

Hi,

Here is my build and my new plan also.

OLD
22x25mm 60cm long carbon tube
center and edges reinforced with 16,18,20 mm carbon tubes.
I used 8cm long 10mm OD carbon tubes to make backline holders.
I used epoxy to glue the parts and I used epoxy also to smoothen the center hole.
I used dremel to smoothen the center hole after epoxy
Edges were sealed with bicycle caps.

Total weight with 15m racelines 305 grams

NEW
22x25mm 60cm long carbon tube
https://www.ebay.com/itm/25mm-X-22mm-10 ... 2749.l2649
center reinforced with 20x22mm carbon tube and 20mm nylon bar
https://www.ebay.com/itm/3K-Glossy-Surf ... 2749.l2649
https://www.ebay.com/itm/1-pcs-Nylon-Po ... 2749.l2649
I will use 8cm long 10mm OD carbon tubes to make backline holders.
https://www.ebay.com/itm/Tarot-TL68B22- ... 2749.l2649
I will use epoxy to glue the parts and I used epoxy also to smoothen the center hole.
edges reinforced with graffiti rod and carbon tube 20x22.
https://www.ebay.com/itm/Carbon-Stirrin ... 2749.l2649
Attachments
20180714_074145.jpg
20180713_221522.jpg
20180714_074241.jpg
20180714_074154.jpg
20180714_074134.jpg
20180714_074127.jpg
20180714_074120.jpg
20180714_073947 (1).jpg


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