Weight in Red Sea? - already googled.

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Richard Faulkner - 07 Dec 2004 13:20 GMT

I've googled and cant find an answer so....

With my wet suit and a 12l steel tank I use:

8kg in Atlantic Tenerife (fractionally buoyant at safety stop)

5kf in freshwater swimming pool in Manchester (fractionally buoyant at
3m)

How much extra weight will I need in the Red Sea next week with a 15l
presumably aluminium tank?

Also, whilst I am continuously thinking about using less air, I tend to
be able to do around 40mins at around 22m with a 15l tank, and 33mins at
22m with a 12l tank, (50bar at safety stop). I am very conscious that
this means an experienced buddy generally ends their dive with around
100bar.

I know it takes practice, but any extra tips keep helping.

Many thanks

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Richard Faulkner

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Tony Howard - 07 Dec 2004 17:32 GMT

It depends on many factors, including:

Your overall personal body density, if you carry a lot of fat then you will
be more buoyant.

Type of kit, especially size and thickness of wet-suit and the cylinder size
and material.

For example, I was diving in the red sea last month and I am 5'7" (165cm)
and 14stone.

My kit was a 3mm one piece wetsuit and twin 12L steel cylinders on an
aluminum backplate and wing with standard plactic fins.

I required 10Lbs of lead (about 4.5Kg).

The only way to test this is in the wather which is why you shoud do a
shalow dive as your 1st check-out dive and work out how much you need then,
preferably with a cylinder on reserve not full (50 BAR).

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Richard Faulkner - 07 Dec 2004 19:12 GMT

>It depends on many factors, including:
>
[quoted text clipped - 15 lines]
>shalow dive as your 1st check-out dive and work out how much you need then,
>preferably with a cylinder on reserve not full (50 BAR).

Thanks for that Tony. I'm aware that "it depends", and I suppose I was
really wondering how much more buoyant the Red Sea is to the Atlantic or
a Freshwater swimming pool.

I know it's a bit like asking how long is a piece of string, but someone
who has dived in both could suggest that they used say, 8kg in the
Atlantic, and 10kg in the Red Sea, or similar.

In fact, I wonder how much weight you use with a similar configuration
in ordinary salt water?

I'll know on Monday <g>, but wanted to make the educated guess before
going.

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Richard Faulkner

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James Q. - 07 Dec 2004 21:59 GMT

http://www.saudidiving.com/red-sea-maps.htm
http://en.wikipedia.org/wiki/Sea_water
http://www.aquacraft.net/sp0001.html

I hope that is enough to confuse the issue.

>>It depends on many factors, including:
>>
[quoted text clipped - 32 lines]
> I'll know on Monday <g>, but wanted to make the educated guess before
> going.

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Richard Faulkner - 07 Dec 2004 22:53 GMT

>http://www.saudidiving.com/red-sea-maps.htm
>http://en.wikipedia.org/wiki/Sea_water
>http://www.aquacraft.net/sp0001.html
>
>I hope that is enough to confuse the issue.

Approx. 1%

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Richard Faulkner

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Lee Bell - 08 Dec 2004 00:33 GMT

> I've googled and cant find an answer so....

Try thinking instead. Then Google. To answer your question, one needs
several bits of information not presented. Specifically, one needs the
density of water in Atlantic Tenerife, the denisty of water in the
Manchester pool and the density of water in the Red Sea. One also needs the
displacement of your body and equipment.

The problem is not as insoluble as it might seem. Armed with the density of
water in Atlantic Tenerife and in the Manchester pool, knowing the change in
buoyancy between the two allows you to calculate the displacement of your
body and equipment. Knowing that, you can calculate your buoyancy in the
Red Sea and the weight you'll need for diving there.

No, I'm not going to look up the densities or do the calculations for you.

> I know it takes practice, but any extra tips keep helping.

Ahhh, now this one is easy. The primary key to good air consumption is
relaxation. The calmer and more relaxed you are, the lower your consumption
will be. Quit worrying about how much gas you are breathing and quite
trying to get your breathing patterns just right. Relax and enjoy your
diving and dive a lot. Low consumption will follow.

Lee

The trouble with our liberal friends is not that they're ignorant: It's just
that they know so much that isn't so.
Ronald Reagan

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Brian Nadwidny - 08 Dec 2004 06:58 GMT

> I've googled and cant find an answer so....

Given all the factors you've laid out I would suggest to start with 10
lbs. Adjust from there.

Brian
Edmonton, Alberta

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