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  1. #1
    Join Date
    Nov 2006
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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

  2. #2
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    Default

    You might be better asking that question in the trailer section
    TRAILERS & OTHER FABRICATED STUFF

    Michael

  3. #3
    Join Date
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    Default

    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

  4. #4
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    Hi Stu,
    Just flat road and caravan parks mate.

  5. #5
    jatt's Avatar
    jatt is offline Always within 10 paces from nearest stubby holder
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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.
    Frisky wife, happy life. ​Then I woke up. Oh well it was fun while it lasted.
    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".

  6. #6
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    NSW
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    Default

    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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  7. #7
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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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