Hmm, I'd consider a 0.5 *1/16 inch alloy tube a bit too small for your 
purpose.
Something like 0.75 * 1/16 inch feels more suitable.

considering strength of a tube has a quadratic relation to diameter and 
is only linear to wall thickness, going up in diameter is generally a 
lot more effective strength-wise than getting a larger wall-thickness

Michiel


On 03 apr 2005, at 4:59, Mike Hord wrote:

> I'm looking for an endorsement on the strength of aluminum
> tubing.  McMaster-Carr has tons of available tubing sizes,
> and the price range is remarkable.  .5" with 62th walls is
> $4.74 per 8 ft.  The next thickness, in 6 ft, is $45.71.
>
> Prices for other diameters, same wall thickness, scale
> likewise.  Alloy is 6063 ultra-corrosion resistant
> architectural aluminum.
>
> The application is new seats for my canoe.  I intend to
> make a rectangular frame, about 2 ft by 6 in.  The long
> sides of the rectangle extend out past the end of the
> structure, for a shape like this:
>
> ___________________
>   |                           |
>   |                           |
> ~~~~~~~~~~~~~~~~~
>
> The ends are screwed into the gunwales, and nylon
> straps will be riveted into the underside of the tubes
> across both axes, forming a strap web.
>
> Does anyone have any recommendation here?  1/16"
> seems like a thin wall to hang my rear on while
> paddling.  I was thinking 5/8" or 3/4" tubing- same
> wall thickness, though.
>
> My alternative is solid aluminum rod, but that is not
> desirable from a riveting point of view, or by weight.
>
> Mike H.
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