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Old 01-02-2013, 01:11   #1
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Join Date: Oct 2010
Location: Perth west australia, Indian Ocean
Boat: Samson C-Falcon 41'9" composite ketch (designed by Cece Norris)
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What are the SWLs for Aluminum Sections?

Just looking at putting out 2 'beams' from the stern about 2 meters long to put the RIB on. Will be supported by sleeving inside similar 'socket sections' onboard, and with standing rigging to mizzen head from the outboard end.

As an example I have seen rectangular section 100mm x 50mm x 3mm, but I have no idea what SWL that would be. (6mm is also available)

Does anyone know what a MPa is, and whether it refers to deflection over a given length??

How about approximations to kg/m?

I fancy an I beam as it will be easier to fit wood slats into it - how much weaker is it?

Or should I bite the bullet and go for steel...?

any websites or engineers beginners guides welcome!

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Old 01-02-2013, 01:19   #2
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Re: What are the SWLs for Aluminum Sections?

For structures in Aluminium it is typically the deflection that you can accommodate rather than the SWL.

Just a guess, but your biggest issue may be deformation and failure where the beam meets the socket. Other than that, the section you have chosen is likely quite stiff enough for your task ... unless its a proper RIB with 200HP engines
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