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  1. 13th December 2013, 02:48 PM #1
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    garfield
    garfield is offline SENIOR MEMBER
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    Default How to work out what weight to be carried

    Hi,
    Just wondering is there a method for working out what thickness wall and what dimensions steel I should use against the weight of the gear I want it to carry?

    I'm thinking of making a boat rack for for my tinny to go on my camp trailer for trips away. I wouldn't know exactly how much the boat weighs, but I'm tipping somewhere in the 60-70kg mark and I'm just wondering what size steel tubing I should use to build it.
    I want to build it with gussets in the corners for added strength also, and I'm curious if there is some sort of formula I could follow to help me select the outer dimensions of the tube and also the wall size?
    Any advice would be greatly appreciated.
    Thanks
    Geoff
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  3. 13th December 2013, 06:41 PM #2
    Michael G
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    You might be better asking that question in the trailer section
    TRAILERS & OTHER FABRICATED STUFF

    Michael
  4. 13th December 2013, 07:58 PM #3
    Stustoys
    Stustoys is offline GOLD MEMBER
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    Rather diagonal bracing that gussets.
    I built a roof rack for a mates 4WD (roof top camper thingy).
    I was never completely happy with the result. But at the time couldnt come up with an idea to fix it I was happy with either. I said I think it will be ok, but if its going to fail it will fail right there.... Well I was wrong and right
    With some rope work he did manage to finish his trip(across one of the deserts) and get home, though by the time he got there 3 of the 4 joints I wasnt happy about had failed. Pitty that it was a good looking rack otherwise lol. They did say the roads were shocking....... but still.

    So first thing to think about would be "where are you planning on going?"

    Stuart
  5. 16th December 2013, 01:41 PM #4
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    garfield
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    Hi Stu,
    Just flat road and caravan parks mate.
  6. 18th December 2013, 08:59 PM #5
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    jatt
    jatt is offline last seen punching holes in canvas
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    Of course how its constructed will have a bearing on things.

    If it was me building it I would go for 40 x 40. 2mm wall would be plenty.
    www.lockwoodcanvas.com.au

    I will never be the person who has everything, not when someone keeps inventing so much cool new stuff to buy.

    From an early age my father taught me to wear welding gloves . "Its not to protect your hands son, its to put out the fire when u set yourself alight".
  7. 18th December 2013, 10:53 PM #6
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    garfield
    garfield is offline SENIOR MEMBER
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    Thanks for the advice.

    I was thinking 35x35 1.6 with a 30x30 1.6 to telescope the 35x35.

    I was kind'a thinking I'd like to match something similar to the picture
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  8. 18th December 2013, 10:55 PM #7
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    garfield
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    Or like this and add one of them baskets from ebay or supercheap auto with some U bolts
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