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Thread: How heavy is that post.
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30th May 2012, 03:28 PM #1New Member
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How heavy is that post.
I have purchased a property that has 9 hardwood poles. I am want to know how to calculate their weight. I want to use them as anchor points for a wind generator.
They are between 200mm dia and 3 meters long.
Cheers Zac
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30th May 2012, 03:33 PM #2GOLD MEMBER
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From memory, if you know the species you can probably find out the density. Once you know the density you can work out the weight once you calculate the volume. Hardwood isn't specific enough though - there are lots of different hardwoods and the density varies.
The other day I described to my daughter how to find something in the garage by saying "It's right near my big saw". A few minutes later she came back to ask: "Do you mean the black one, the green one, or the blue one?".
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30th May 2012, 03:40 PM #3New Member
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30th May 2012, 04:08 PM #4Intermediate Member
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Ok, to find the weight, you first need to calculate the volume. To do this, measure the diameter of both ends of your log, add them together and divide by 2 to get your average diameter. eg. 0.3m (300mm) + 0.2m (200mm) /2 = 0.25m. This is then divided by 2 to get a radius, so 0.125m.
Area is calculated as 3.142 x radius squared. In effect, 3.142x(0.125x0.125)= 0.049m3
Multiply this by the length to get volume. In your example, 3m gives you a volume of 0.147m3.
To get the weight, multiple the volume by the density. This varies with the timber species and also if it is green or dried timber.
As an example, River Red Gum, Eucalyptus camaldulensis, is listed as 1130kg/m3 green and 900kg/m3 air dried. So your log could be anywhere between 166kg and 132kg.
If you post the measurements and species, I can work out the weights for you, or PM me.
Just out of curiosity though, how will knowing the weights help you? Aren't you using these poles as anchors, as in burying one end in the ground, probably in concrete?
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31st May 2012, 12:25 AM #5
Hi Zac
to use them as anchors for a wind generator you will need to either bury most of each pole in the ground (like a stake) or all of each pole about 2m below the ground as a dead man
In either case the weight of the pole won't matter
If you're looking for above ground anchors for your wind generator, I'd suggest you should be thinking of 1-2 tonne concrete blocks.regards from Alberta, Canada
ian
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