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Frequently Asked Questions (FAQ's): Discuss Additional weight for salt water diving in the Site Administration forums: Evening all. Just a general idea finding question really. I currently use 11.5 kg of lead shot for inland ...

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Old 30-06-06, 07:32 PM
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Question Additional weight for salt water diving
Evening all.

Just a general idea finding question really. I currently use 11.5 kg of lead shot for inland diving. I was wondering how much I might be looking at having to add for sea diving. I know everyone is different, but I am guessing that there is a rough percentage of weight that you have to add when you go into salt water.

Thanks all.
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Old 30-06-06, 07:36 PM
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Old 30-06-06, 07:39 PM
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You definitely need more - you and your kit are more bouyant in saltwater than fresh.

I tend to add 2kg between fresh and salt, some add 3kg.
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Old 30-06-06, 07:40 PM
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I was considering 2.5 Kg as its what I happen to have handily measure out in my extra pouch and my ankle weights
I'd better buy an extra kg though just in case, or attach my old spare 4 pound weight somewhere stable beforehand
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Old 30-06-06, 07:55 PM
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Old 30-06-06, 07:55 PM
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Well I believe its supposed to be around 3% of the total weight of you+kit, which is where the 3kg comes from (average diver + kit = 100kg?). In practice, 2-3kg.

David
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Old 30-06-06, 07:59 PM
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I believe the density of seawater is 1027 kg/m3 as oppossed to pure fresh water being 1000 kg/m3.

Therefore you will experience an upthrust of 1.027 times freshwater in seawater or an increase of 2.7%.

So if you are netral in freshwater and displace 100kg of water then you'll need an extra 2.7kg of weight in the sea..........or thereabouts.

Is this correct or is this the engineering thread again?

David.
Last edited by David G : 30-06-06 at 08:09 PM.
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Old 30-06-06, 08:12 PM
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2 > 3 kg is about right.
I have two belts one for sea one for fresh, but since useing a backplate and wing I just dive over weight when in fresh water (no weight belt)
Hope that helps mate.
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Old 30-06-06, 08:17 PM
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Dunno really........ thinking about it
  

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Quote:
Originally Posted by Scuby
Well I believe its supposed to be around 3% of the total weight of you+kit, which is where the 3kg comes from (average diver + kit = 100kg?). In practice, 2-3kg.

David
..what do you weigh? please pass the secret to SWMBO

My full kit is circa 65kg so 35kg in the nod
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Old 30-06-06, 11:27 PM
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all the gear, no idea
  

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2kg for me
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