View Full Version : Ditch the aqualung!
Mike Rowley
18-01-2006, 11:51
If you thought rebreathers were new have a look at this. http://www.likeafish.biz/ (http://www.likeafish.biz)
Cheers
Mike:D
Buddy checks will be interesting.. "...BAR etc... And on no account go within 10 metres of my pump inlet valve else you'll be turned into jam"
Of course a side benefit is the fact that you're pumping through 2000 litres of water per minute, and then squirting it out. So you don't need an underwater scooter anymore, just a crash helmet :-)
Keith Lawrence
18-01-2006, 12:12
Buddy checks will be interesting.. "...BAR etc... And on no account go within 10 metres of my pump inlet valve else you'll be turned into jam"
Of course a side benefit is the fact that you're pumping through 2000 litres of water per minute, and then squirting it out. So you don't need an underwater scooter anymore, just a crash helmet :-)I want to see the battery pack that shifts that 2,000 litres!
K
I want to see the battery pack that shifts that 2,000 litres!
I note that you say see and not carry
I want to see the battery pack that shifts that 2,000 litres!
According to their Flash animation, the battery has a copper coloured top. "No other battery LOOKS like it or LASTS like it"
Now how many bumper packs of batteries to pick up at Dixons on the next trip to Sharm... ;)
Paul Morris
18-01-2006, 12:25
Somewhat scarily, I can't prove via google that this is a wind-up.... :eek:
John Williams
18-01-2006, 12:38
If you thought rebreathers were new have a look at this. http://www.likeafish.biz/ (http://www.likeafish.biz)
Cheers
Mike:D
So...have you ordered one Mike?
Will you be setting up a working party to evaluate them and then to draw up a sylllabus for a BSAC "LikeAFish" SDC?
With a nominal yield of 34% ...sounds like an MOD of 30m though!
Think I'd get Duracells for mine rather than cheapo shops own that might fail!
John
We discussed this on our club email mailing list last year, and someone worked out that theoretically it would work.
"If you can could extract 100% of the disolved oxygen it would have to centrifuge 100 litres of water a minute, in oxygen saturated fresh water at 14 degrees and 1 atmosphere. Of course most water isn't fully saturated with oxygen."
The calculation above assumes that you need 1 litre of pure O2 per minute. Probably explains why they need 2000 litres per min, due to lower dissolved O2 in seawater.
Somewhat scarily, I can't prove via google that this is a wind-up.... :eek:
It's not, it's just totally impractical. Think about the energy needed to move two tonnes of water a minute. Think about the force generated by the exhaust pumping out two tonnes of water.
mark - sandman
18-01-2006, 14:20
I want to see the battery pack that shifts that 2,000 litres!
K
I think the paragraph about sub ops is more likely. I.E. you would probably need a nuclear reactor to power it. I 've used twinsets & rebreathers but can't say i relish the thought of rolling off a 5m rib into the sea with a Los Angeles class sub strapped to my wing!!
Mike Rowley
18-01-2006, 16:36
So...have you ordered one Mike?
Will you be setting up a working party to evaluate them and then to draw up a sylllabus for a BSAC "LikeAFish" SDC?
With a nominal yield of 34% ...sounds like an MOD of 30m though!
Think I'd get Duracells for mine rather than cheapo shops own that might fail!
John
I have quite enough work on my plate already thank you John!
One benefit of pumping all that water, you wouldn't need a scooter.:D
I just dare not ask the chap about trimix!:D
Has anyone seen any underwater generators on ebay?:D
Cheers
Mike
Tony Dwyer
18-01-2006, 16:53
Very Interesting, but possible stupid (hat on standby for consumption).
Mention has already been made of the power required to drive the pump. Perhaps a miniature 'Cold Fusion' device is planned?
I like the idea of utilising thrust developed, but how do you turn it off? Presumably one would need jets pointing in all directions to equalise thrust in order to stay in one position. I reckon that would play havoc with viz.
Also, what about torque? This little centrifuge thing would probably generate a fair bit. Perhaps it would be setup to rotate the opposite direction to the motor in order to counteract the torque. Some nifty balancing required.
The notion that all water contains air disolved in usable amounts is possibly falacious. There are probably places that have little or no Oxygen present. For example, I know this to be the case with the deeps in the Black Sea.
Now if it were to use electolysis, it could possibly seperate out large amounts of Oxy to breathe and use the Hydrogen as diluent. Have to watch out for explosion risk though, wouldn't want to be an underwater Hindenburg.
Sorry, brain in silly mode.
The readers are correct with their comments.
Because of large air and water requirements of the system, we have since regulated the device principally to closed system diving.
Oxygen requirements for a closed-system diver are about 1 Liter-per-minute .
This translates to 200 LPM of water (for ideal conditions).
The thrust of this is equivalent to moving a 100 kg diver (incl. tank, weights, etc) about 2 meters in one minute - much less than your common scooter (or normal fin action).
John Williams
21-01-2006, 13:39
The readers are correct with their comments.
Because of large air and water requirements of the system, we have since regulated the device principally to closed system diving.
Oxygen requirements for a closed-system diver are about 1 Liter-per-minute .
This translates to 200 LPM of water (for ideal conditions).
The thrust of this is equivalent to moving a 100 kg diver (incl. tank, weights, etc) about 2 meters in one minute - much less than your common scooter (or normal fin action).
Should probably point out that Alan is the Alan Bodner in the picture on the "LikeAFish" website link that Mike Rowley started this thread with.
Good to see that someone from there has responded to an email flagging up interest and comment - thanks Alan.
John
Tony Dwyer
21-01-2006, 18:42
Looks like my hat may be in danger.
Nice to see Alan stop by and provide input.:)
John Williams
22-01-2006, 09:28
The readers are correct with their comments.
Because of large air and water requirements of the system, we have since regulated the device principally to closed system diving.
Oxygen requirements for a closed-system diver are about 1 Liter-per-minute .
This translates to 200 LPM of water (for ideal conditions).
The thrust of this is equivalent to moving a 100 kg diver (incl. tank, weights, etc) about 2 meters in one minute - much less than your common scooter (or normal fin action).
Making every dive a very gentle drift dive..but one where you decide the direction of drift!
Sounds more like fun now! (rather than a roller coaster out of control!:D )
Wonder if this sort of technology will end up being incorporated into CCRs then?
could we end up with a no-maintenance YBOD? ...just stick it on to charge every night!
John
Mike Rowley
22-01-2006, 13:20
[QUOTE=alan]The readers are correct with their comments.
Because of large air and water requirements of the system, we have since regulated the device principally to closed system diving.
Oxygen requirements for a closed-system diver are about 1 Liter-per-minute .
This translates to 200 LPM of water (for ideal conditions).
This can rise to 3.5 l/min if the diver has to work hard, swimming into a stiff current for instance of even carrying out a rescue. Presumably there is some sort of reostat control on the motor to turn up the wick a bit. Then you could have multible outlet jets, computer controlled and linked to a GPS on your SMB. "Hey presto" - dynamic diver positioning!;)
Mike
John Williams
22-01-2006, 14:05
[
This can rise to 3.5 l/min if the diver has to work hard, swimming into a stiff current for instance of even carrying out a rescue. Presumably there is some sort of reostat control on the motor to turn up the wick a bit. Then you could have multible outlet jets, computer controlled and linked to a GPS on your SMB. "Hey presto" - dynamic diver positioning!;)
Mike
Don't worry Mike...we'll still need excellent skippers to place us in the vicinity of the wreck...Maureen is safe for a while yet!;)
John
Mike Rowley
22-01-2006, 15:07
[QUOTE=John Williams]Don't worry Mike...we'll still need excellent skippers to place us in the vicinity of the wreck...Maureen is safe for a while yet!;)
Phew John! That is a real comfort to my soul. Have you ever considered a career in counciling?:D
Mike
Just think - when you pee in your suit it will be well and truly flushed away - hopefully not you as well!!
Sophie
John Williams
24-01-2006, 16:25
[QUOTE]
Phew John! That is a real comfort to my soul. Have you ever considered a career in counciling?:D
Mike
Seem to remember that you have been given some tuition in that regard Mike...and as a result have now added some pink fluffy bits to your counselling kit - how is the old baseball bat?
Anyway...glad I could provide reassurance on that point!
(I must make the effort to come out on Maureen someday soon!)
John
Mike Rowley
24-01-2006, 16:33
Seem to remember that you have been given some tuition in that regard Mike...and as a result have now added some pink fluffy bits to your counselling kit -
You dont want to believe everything you read or hear John!!:p
Cheers
Mike
Tony Dwyer
31-01-2006, 23:14
MIke
I see that the Beeb have picked up this story. Nice link from them to you and BSAC.
Well done!
http://news.bbc.co.uk/1/hi/sci/tech/4665624.stm
Paul Renucci
01-02-2006, 02:29
Mike - :eek: how on earth did you discover this web site? It's left us speechless and dare I say it airless. 8 litres of flexibag and co2 scrubber? One gulp and it'll be over at any reasonable depth.
Is it April by any chance? :)
I've just been studying the patents:- part off:-
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15. An apparatus according to Claim 1, wherein the separator is adapted to separate at least 25 liters of breathable air per minute.
16. A method for providing breathable air from a body of water naturally containing dissolved air comprising the stepsof : -drawing an amount of water from said body of water; -separating said dissolved air from the drawn water; -expelling the separated water and supplying the separated air for breathing; -expelling the air back into said body of water after it has been breathed.
17. An apparatus according to Claim 16, wherein the body of water is one of the following: ocean, lake, pond and river.
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Data supplied from the esp@cenet database - Worldwide
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(25 ltrs of air per minute - from Ocean, lake or pond)
Well this freshwaterdiver wont be getting much out of his pond except dead carp after using it for 30 seconds.
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