If someone was worried about it, but wanted removable flotation, then why
not pour 2-part urethane flotation foam into the plastic pop bottles? Just
trim the ooze, screw on the cap, and I think it would last just about
forever underwater. Needs to be poked through a deck plate and the deck
plate needs to be good enough quality to stay closed under impact.

Brian

--
My boat project: http://www.advantagecomposites.com/tongass


"Brian Whatcott" wrote in message
...
Wonder no longer: soda cans and plastic soda bottles are favorites for
stress testing in engineering schools. Either of these modern marvels
can take high multiples of the pressure rise noted when going from
coldest Antarctic to hottest Oklahoma. It wouldn't do to deprive the
American public of its taste for gassy soda, or to have explosions en
route.

Brian W

On 23 Dec 2003 11:15:31 -0400, Gregg Germain
wrote:

One has to wonder what happens to the bottles if you put them in
during a chilly spring day, and then the seasons change and it's a 95
degree Summer day.

Or vice versa....if you put them in on a hot day, what happens in
September or October. Do the bottles crush some? Does that imact
flotation?


--- Gregg
"Improvise, adapt, overcome."

Smithsonian Center for Astrophysics
Phone: (617) 496-1558