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Material: alu-tube rigidity
By:CarstenT
Date: 11/14/2012, 3:26 pm

Hi All
After visiting the yostwerks pages on building a folding-kayak I decided to build my own. As it is, I'm usually not following the prescription on anything, and so too as to a transportable kayak. My experience in the 'wild' stresses weight as a dominant and primary factor .. anyway, short story: I bought 20 1m*10mm carbon-fiber tubes to act as gunwale and chines with a set of 5 1m 30mm alu-tubes to act as a keel. I've been fiddeling with some of the minor details, but today I got 4 of the 5m alu-keel up and hanging in strings attached to each end. This setup does not reflect how it will respond in water, but .. gee, it's SOFT. Awful soft. My instinct tells me that it's too soft to act as the central and only 'rigid' structure to 'hang' everything else up on.
Has any of you any idea weather I'm out on a too soft limb here?
The alu-tubes are 30mm ø-outside 26mm ø-inside. They are attached by inlined tubes 24mm ø-outside 22mm ø-inside - the 2mm discrepancy covered with tape, but the bending of the long assembled tube is not particularly focussed here, it appears to be the overall elasticity of the collective tube.

Messages In This Thread

Material: alu-tube rigidity
CarstenT -- 11/14/2012, 3:26 pm
Re: Material: alu-tube rigidity
Marc Upchurch -- 11/14/2012, 6:55 pm
Re: Material: alu-tube rigidity
ancient kayaker -- 11/15/2012, 12:06 am
Re: Material: alu-tube rigidity
Bill Hamm -- 11/15/2012, 2:03 am
Re: Material: alu-tube rigidity
Brian Nystrom -- 11/15/2012, 7:18 am
Re: Material: alu-tube rigidity
Bill Hamm -- 11/16/2012, 10:22 am
Re: Material: alu-tube rigidity
Brian Nystrom -- 11/16/2012, 12:31 pm
Re: Material: alu-tube rigidity
CarstenT -- 11/16/2012, 5:32 pm
Re: Material: alu-tube rigidity
Marc Upchurch -- 11/16/2012, 9:22 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/17/2012, 1:39 pm
Re: Material: alu-tube rigidity
Marc Upchurch -- 11/17/2012, 3:53 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/18/2012, 12:35 am
Re: Material: alu-tube rigidity
Marc Upchurch -- 11/18/2012, 9:40 am
Re: Material: alu-tube rigidity
Bill Hamm -- 11/19/2012, 1:16 am
Re: Material: alu-tube rigidity
Mike Savage -- 11/17/2012, 3:54 pm
Re: Material: alu-tube rigidity
Marc Upchurch -- 11/17/2012, 7:07 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/18/2012, 12:38 am
Re: Material: alu-tube rigidity
Mike Savage -- 11/18/2012, 12:42 pm
Re: Material: alu-tube rigidity
Yostwerks -- 11/15/2012, 11:06 am
Re: Material: alu-tube rigidity
CarstenT -- 11/15/2012, 12:22 pm
Re: Material: alu-tube rigidity
Yostwerks -- 11/15/2012, 1:42 pm
Re: Material: alu-tube rigidity *PIC*
Yostwerks -- 11/15/2012, 2:02 pm
Re: Material: alu-tube rigidity
CarstenT -- 11/15/2012, 3:04 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/16/2012, 10:26 am
Re: Material: alu-tube rigidity
Jeff Buyer -- 11/15/2012, 11:11 am
Re: Material: alu-tube rigidity
CarstenT -- 11/15/2012, 12:51 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/16/2012, 10:32 am
Re: Material: alu-tube rigidity
CarstenT -- 11/16/2012, 5:53 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/17/2012, 1:42 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/16/2012, 10:29 am
Re: Material: alu-tube rigidity
Jeff Buyer -- 11/16/2012, 11:21 am
Re: Material: alu-tube rigidity
Bill Hamm -- 11/17/2012, 1:44 pm
Re: Material: alu-tube rigidity
Jeff Buyer -- 11/17/2012, 3:53 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/18/2012, 1:45 am
Re: Material: alu-tube rigidity
Jeff Buyer -- 11/18/2012, 1:56 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/19/2012, 1:19 am
Re: Material: alu-tube rigidity
CarstenT -- 11/16/2012, 6:53 pm
Re: Material: alu-tube rigidity
Marc Upchurch -- 11/16/2012, 9:29 pm
Re: Material: alu-tube rigidity
CarstenT -- 11/17/2012, 5:30 am
Re: Material: alu-tube rigidity
Yostwerks -- 11/17/2012, 10:40 am
Re: Material: alu-tube rigidity
Bill Hamm -- 11/17/2012, 1:47 pm
Re: Material: alu-tube rigidity
Jeff Buyer -- 11/17/2012, 4:07 pm
Re: Material: alu-tube rigidity
CarstenT -- 11/17/2012, 4:34 pm
Re: Material: alu-tube rigidity
Jeff Buyer -- 11/17/2012, 5:40 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/18/2012, 1:50 am
Re: Material: alu-tube rigidity
Jeff Buyer -- 11/18/2012, 2:10 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/19/2012, 1:22 am
Re: Material: alu-tube rigidity
Bill Hamm -- 11/18/2012, 1:51 am
Re: Material: alu-tube rigidity
Jeff Buyer -- 11/18/2012, 2:07 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/19/2012, 1:25 am
Re: Material: alu-tube rigidity *PIC*
Yostwerks -- 11/19/2012, 10:14 am
Re: Material: alu-tube rigidity
CarstenT -- 11/18/2012, 4:31 am
Electrolysis
CarstenT -- 6/2/2013, 6:39 am
Re: Electrolysis
Jeff Buyer -- 6/2/2013, 7:39 am
Re: Electrolysis
CarstenT -- 6/2/2013, 9:46 am
Re: Electrolysis
Tom Cooper -- 6/2/2013, 10:35 am
Re: Electrolysis
CarstenT -- 6/2/2013, 12:57 pm
Clogged up hinges. Solution
CarstenT -- 6/26/2013, 4:43 am
Re: Material: alu-tube rigidity
JohnAbercrombie -- 11/18/2012, 3:03 pm
Re: Material: alu-tube rigidity
Bill Hamm -- 11/19/2012, 1:33 am
Re: Material: alu-tube rigidity
Yostwerks -- 11/19/2012, 9:48 am
Re: Material: alu-tube rigidity
CarstenT -- 10/17/2014, 5:31 am
Re: Material: alu-tube rigidity
Bill Hamm -- 10/17/2014, 9:56 am
Re: Material: alu-tube rigidity
CarstenT -- 10/18/2014, 6:00 am