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-   -   How is this done? (http://www.canreef.com/vbulletin/showthread.php?t=47055)

Trigger Man 12-01-2008 06:58 PM

It is cool looking, but with any failure in the system I would not want to be the one cleaning up the mess.

ron101 12-01-2008 07:03 PM

Quote:

Originally Posted by lastlight (Post 364588)
if you placed a mostly full pop bottle of water into the sink upsidedown quickly, the water would stay in the bottle. Could you not then have an air pump with the input inside the bottle drawing from that air cavity at the top? Blow this air into the bottom of the bottle so it just goes right back where it came from?

Yes but I would be concerned about eventual oxygen depletion from recycling the air. Although there may be enough gas exchange from the 'open' areas of the tank.

moldrik 12-01-2008 07:11 PM

Go
 
Depends on how the tank is setup, it wouldn't be a big mess.

If you fill up the bottom tank, setup the vertical part, and vacuum the vertical part, you basically guarantee that if it fails, all the water would be sitting in the bottom tank. The water probably wouldn't splash either because of the vacuum that has been setup at the top.

If the vacuum is stable, it technically will hold, since the only way that water will get out of there is by new air coming in. And basically as the new air comes in, the same, small volume of water water would be pushed out.
________
CD175

Rippin 12-01-2008 07:14 PM

Quote:

Originally Posted by lastlight (Post 364588)
if you placed a mostly full pop bottle of water into the sink upsidedown quickly, the water would stay in the bottle. Could you not then have an air pump with the input inside the bottle drawing from that air cavity at the top? Blow this air into the bottom of the bottle so it just goes right back where it came from?

I think that's exactly what's being done for this aqaurium.

Delphinus 12-01-2008 07:18 PM

Interesting ... I bet that's it. I was thinking it was maybe a panel of glass separating the air curtain from the vacuum side but I bet you're onto something there. A "closed loop" but for air instead of water. :lol:

sphelps 12-01-2008 07:34 PM

Quote:

Originally Posted by lastlight (Post 364588)
if you placed a mostly full pop bottle of water into the sink upsidedown quickly, the water would stay in the bottle. Could you not then have an air pump with the input inside the bottle drawing from that air cavity at the top? Blow this air into the bottom of the bottle so it just goes right back where it came from?

Yeah that's what I was thinking but you would need one hell of an air pump. That tank looks 4 feet tall, that's a pressure of 4 feet of H20 the pump would have to overcome. And I think it would have to be more along the lines of a venturi as an air pump wouldn't last too long with the moisture and humidity it would be exposed to in this situation.

sphelps 12-01-2008 07:37 PM

I guy could probably use a float switch to activate some kind of vacuum system when the air pocket got to a certain size.

ElGuappo 12-01-2008 09:55 PM

If you look at the top of the tank he has a line drawn at the fill point of the waterline.

I also think this is done wiht mirrors. one scene the fish are in the top half then it cuts and they are all in the bottom. then when they swim under the top part they disappear. you can clearly se the top has a bottom pane of glass.

The Codfather 12-01-2008 10:22 PM

Tank
 
http://www.youtube.com/watch?v=Z7tq4LRurMs
This shows how the tank was built. No tricks, this works.

untamed 12-01-2008 10:39 PM

Quote:

Originally Posted by lastlight (Post 364588)
if you placed a mostly full pop bottle of water into the sink upsidedown quickly, the water would stay in the bottle. Could you not then have an air pump with the input inside the bottle drawing from that air cavity at the top? Blow this air into the bottom of the bottle so it just goes right back where it came from?

That's exactly how I think it works...and that it was very clever to come up with it.


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