# COMMUNITY : FORUMS : COMMUNITY BLOG

## Speaking of a boat made from recycled bottles.....

Here is an article and a video about a couple that wishes to sail their boat made of plastic bottles, from San Francisco to Australia.

David de Rothschild is preparing to sail from San Francisco to Australia in a raft made of 12,000 recycled bottles. Among other things, he is hoping to convince the world to take better care of its waste.

The Link and video are here

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bosherston8 years ago
Hmm... rich kid, albeit environmentally aware rich kid, makes boat filled with CO2. Convince me. :-)
Goodhart (author)  bosherston8 years ago
I wonder if he has set sail yet?
jessyratfink8 years ago
It's actually sort of nice to see some progress being made on this. So far I'd only been seeing mock-ups. The dry ice idea is pretty clever, as well. :D
Goodhart (author)  jessyratfink8 years ago
Yeah, I thought so to :-)
8 years ago
Wot's the dry ice idea? (video started off with a commersh, got bored, clicked back)
Goodhart (author)  Tool Using Animal8 years ago
The idea is to put a lot of dry ice into the bottles, seal them and inflate/pressurize them to enhance their floatability.
8 years ago
I think the real purpose of the dry ice is to increase the rigidity of the bottles through an increase in the axial and hoop stresses, in reality, would not a pressurized bottle float slightly lower than an unpressurized bottle of the same volume?
Goodhart (author)  Tool Using Animal8 years ago
Hmm, I would think the greater volume of gas in the bottle would make it float better, but I am, by no stretch of the imagination, any kind of expert on gas and the physics surrounding it.
8 years ago
A quick google shows that the density of air @STP is 1.29 g/L and carbon dioxide is 1.98 g/l so even at the same pressure the co2 bottle is already heavier, when you pressurize the bottle you are additionally increasing the density of the gas and consequently the bottle gets even heavier.
Goodhart (author)  Tool Using Animal8 years ago
Um, have you drank any water from one of those little bottles recently? If you increase the pressure by very much, it would easily burst. Still, for some reason, I didn't think buoyancy depended on weight.
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