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PostPosted: Sun Aug 24, 2008 7:53 pm 
Site Admin

Joined: Thu Apr 14, 2005 12:34 pm
Posts: 1742
Location: Southeast Michigan
In the past I've purchased a lot of steel and aluminum shapes from Online Metals. Recently I joined their referral program, so you can now order metals and plastics through this link:

http://www.onlinemetals.com/index.cfm?affiliate_id=604

...and earn commissions to help support Foldingkayaks.org.

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Michael Edelman
FoldingKayaks.org Webmaster


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PostPosted: Tue Aug 26, 2008 7:55 pm 
lord high faltbotmeister
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Joined: Sat Mar 24, 2007 6:30 pm
Posts: 681
Location: Stone Mountain, Ga. U.S.A.
Good deal Mike and a good way to support the FKO. I am always looking for a source for some of these products.

Chris.

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"No matter where you go, there you are."

Wilderness Systems Cape Horn 150


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PostPosted: Thu Apr 15, 2010 2:20 am 
While looking around the net I found that Sailrite.com has aluminum tube 3/4 and 7/8 dia.s in 6063 T832 max length 8 ft, and laminated 18 oz PVC polyester weave core sheet. HH-88 too. I have had good dealings with them in the past.

http://www.sailrite.com/Tubing-Aluminum-3-4
Sleepy


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PostPosted: Thu Nov 11, 2010 2:08 pm 
Has anyone used EMT conduit instead of aluminum for their folding kayaks? I know it wouldn't have the weather resistance as aluminum but for short term fresh water use, I wonder if it would work. Home depot sells 10 feet for $3.18


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 Post subject: Re: EMT conduit
PostPosted: Tue Dec 28, 2010 12:05 pm 
paddler

Joined: Tue Dec 07, 2010 1:04 pm
Posts: 7
I looked at using EMT for frames, along with billboard vinyl skins as an inexpensive project for a local Boy Scout troop. 3/4" PVC pipe has the right ID to act as couplings for the 1/2" EMT's OD. I figured 6" or 1' sections of the PVC would act as better moment couplers than normal EMT couplings. I did a computer model using a a rough estimate of the PVC pipe's Young's Modulus based on some quick internet searches. The calculated deflections for the PVC/EMT combination was similar to the aluminum tubing in Tom's original design. No guesses on if the PVC coupling would fail in rough conditions though.

The research project looked encouraging, and I bought EMT and PVC for the keel and stringers. I had a cool idea about building the skins without a frame by calculating the required cut sizes in the side panels to create the right 3D hull shape.

Unfortunately that's about as far as I got :oops: . When we received the billboard vinyl it had too many tiny pinprick holes to be airtight for self-made sponsons. We made a number of attempts to get the sponsons patched enough to hold air, but there were just too many holes. Purchasing FOLBOT sponsons will push the project right out of the troop's meager budget. I still think the billboard vinyl would be watertight enough for the skin, but I've given up on it serving as sponson material. I still have the uncut EMT and PVC sitting in my garage wating to pick up the project again.

I keep getting the itch to try again, with heat-sealable nylon sponsons, but for now the project is sitting in the queue behind DIY camping gear and other projects. Wood longbows and hammocks were my most recent distractions; pack cover/ponchos and rain tarps are my current distraction. A play kayak from a campaign sign will follow those (see the Corogami.net website for the concept). If there is a blowout sale on heat-sealable nylon this project would jump back to the front of the queue :D


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