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Old 20 November 2007, 08:45   #1
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Might Be Good?

http://www.water-buoy.com/
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Old 20 November 2007, 08:48   #2
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This was on Dragons Den last night, I bet he was sweating on the 1kg test, took a while to inflate.
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Old 20 November 2007, 09:42   #3
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Call me old fashioned...(no dont) but if it doesnt inflate..its gone forever..give me a cork..
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Old 20 November 2007, 10:23   #4
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I wonder how it'd cope at depth?

For example if it didn't inflate 'til it was 15m down would it still have enough buoyancy to bring it back up?
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Old 20 November 2007, 10:29   #5
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Surely the deeper it goes the more pressure to push it up?

Chris
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Old 20 November 2007, 10:49   #6
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No-the other way round. At 10m pressure is at 2 atmospheres, therefore half the volume and half the buoyancy.

Boyle's Law

pV=k
where:

p denotes the pressure of the system.
V is the volume of the gas.
k is a constant value representative of the pressure and volume of the system

or in this case, V=p/k
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Old 20 November 2007, 11:53   #7
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Bull Sh*t

As usual Dragon's Den was a load of ....
This guy claimed his design was the only one, how about this then?

http://www.firebox.com/product/1831?...src_id=keybuoy

May not lift 1kg but less than half the price.
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Old 20 November 2007, 13:39   #8
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Indeed - these were on display at METS 2 years ago...
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Old 20 November 2007, 13:55   #9
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water buoy

I will let you know I have ordered a couple to test
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Old 21 November 2007, 09:54   #10
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Indeed - these were on display at METS 2 years ago...
. . . and WaterBuoy had a fancy display this year. I did pick up a leaflet because I thought it looked quite good but didn't stop to check out pricing. Anyone got a link for the Dragon's Den? Would quite like to see that.
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