Shallow dive gear

fishermantwo said:
Surprised no one has mentioned a hookah. Locally they are in wide use, at least 80% of the yachts moored in my home town have one. Perfect for your situation.
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There's all kinds of gear he could use, but the difficulty seems to be getting hold of it in-country.

Pete
 
fishermantwo said:
Surprised no one has mentioned a hookah. Locally they are in wide use, at least 80% of the yachts moored in my home town have one. Perfect for your situation.
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I mentioned it in post 9, but I've never used one.
I don't think they are well regarded in the UK?
How much do they cost, what brands are respected?
Cheers,
 
I assembled my own from standard parts used in "bought" ones for about $300. They are widely used commercially and for amateur use in Australia and the USA. No idea why the UK has this weird idea about them.
 
bikedaft said:
Can you assemble many fat people on the bow with beers to keep them there?
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Although I specialize in sailing boats, I've checked a number of props etc with heavy people on the bow. If I need to do some work I'd rather pull the bow down to a weight. It always surprises me how high you can get the stern. Moving weight/water etc is important too.
Allan
 
fishermantwo said:
I assembled my own from standard parts used in "bought" ones for about $300. They are widely used commercially and for amateur use in Australia and the USA. No idea why the UK has this weird idea about them.
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Most grateful if you could post a list of those parts and the suppliers. I've been thinking of buying one of the commercial ones for prop cleaning, etc, but at $1500 they are a bit much.
 
ytd said:
Most grateful if you could post a list of those parts and the suppliers. I've been thinking of buying one of the commercial ones for prop cleaning, etc, but at $1500 they are a bit much.
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The pump is a Thomas 907 http://www.gd-thomas.com/product.aspx?id=13740&tp=p. Its the same one that $1500 unit uses. I bought mine off USA EBay. Buy 30 metres of hookah hose either off eBay or a hose supplier. Ensure its graded hookah hose. With 30 metres of hose in the water you don't need the cooling chamber. The low pressure regulator came from a dive shop in Cairns, this was about the dearest item at about $100. I simply bought a replacement regulator for the same $1500 unit! It has to open at low pressure, about 15 to 20 pounds. You can modify a normal second stage reg but by the time you find a suitable spring and someone to rebuild it its cheaper to buy the other unit.

I have mine mounted on a horse shoe shaped frame made from 2" stainless tube. The pump feeds that so I do have some reserve but its mainly just something to bolt the pump to. I have a gauge too but just because there was one laying about in the workshop. Switch on the frame and the lot runs from a 25 amp deep cycle battery.
 
Dear All,

Thanks for all the suggestions and opinions both serious and less serious. Luckily I have managed to secure the use of a full set of dive gear so problem solved. Hopefully it should be fairly straightforward and we can get my friend up and running again.

For the sake of the worriers I should point out that my good friend and colleague will be in the water with me so while still technically diving alone he will be looking out for me.

Thanks again.

Russell
 
slipknot said:
Is that the actual model you use, does it practically deliver enough air? I thought you would need much more air than that. Say 160l/Min http://www.boyuaquarium.com/En_ArticleShow.asp?ArticleID=2052
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This one on eBay uses the same type of pump you linked to: http://www.ebay.co.uk/itm/350902957510
It says the pump is: 120w @ 12V Weight: 9 lb which tallies with the ACQ-910, as you suggested.

However, I would say that was more than necessary, even allowing a safety factor of two. [Edit] See calculation in post #37

I just emailed the USA eBay seller to ask what the output is. I got a warning from eBay that they are in a different country, and may speak a different language. How true :)
I have also emailed BOYU to ask for prices.

I'm keen to get this sorted, as I did plan to buy the eBay item when I'm in the USA next month.
 
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slipknot said:
fishermantwo said:
The pump is a Thomas 907 http://www.gd-thomas.com/product.aspx?id=13740&tp=p.

The pump you refer to above delivers 2.1CFM or 58.1L/min. Is that the actual model you use, does it practically deliver enough air? I thought you would need much more air than that. Say 160l/Min

http://www.boyuaquarium.com/En_ArticleShow.asp?ArticleID=2052
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A 12 litre scuba tank is good for perhaps an hour at shallow depths?
Taking it from 230 bar to 30 bar say. That's 200x12litres at ambient per hour, which is 40 litres a minute.
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prv said:
That's true, though it can be mitigated by exhaling directly into the water either via a valve or simply through the nose. More problematic is that you're asking your lungs to expand outwards against a pressure differential of 100 millibars per metre of depth and most people's intercostal muscles are not up to this. Even hanging vertically in the water with a standard snorkel is noticeably harder work - any deeper and you can't breathe in at all.

I'd have thought an experienced diver would understand this intimately.

Pete
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PADI then!
 
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