If your boat's 10 feet under, you're all done trying to float anyway.
Flotation is designed to keep a boat at the surface, e.g. hard to push under
in the first place (good luck) and hopefully to make the boat float upright
if swamped (if you've got enough of a boat so you have room for the required
flotation.)

Brian

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


"Brian Whatcott" wrote in message
...
If the peanut gallery says that sinking an empty soda bottle to 10
feet will collapse it, then the same applies to any flexible air
container unless you want to put a tube in a tire/rim, and blow it up
to 15 psi per 30 feet of submersion at least!

Brian W



On Wed, 24 Dec 2003 20:12:40 GMT, Jim Conlin
wrote:

Just a minute!
Two-part foam is not necessarily a good solution either.
Some of 'em will soak water, getting heavy and encouraging rot and
mildew.
They prevent access for repairs and wiring, etc.
THey're not cheap, either.

Have you considered inflatable items like truck tubes?

Tailgunner wrote:

Here are my conclusions regarding that long thread I started about
using
Ping Pong Balls for floatation..

Ping Pong balls are not cost effective. $20/144
PPB burn real nice.
PPB are relatively fragile.

2 Liter Soda Bottles are cost effective.
2 LSB can withstand the temp changes here in New England.
2 LSB looses volume quickly under external pressure. Designed mainly
for
internal pressure.

Both will degrade in direct sunlight.

What will I do? More than likely I will fall in with everybody else and
use 2 part. I'll just have to make allowances for moisture to be able
to
flow from bow to stern. With either of the other methods I would not
have to do this.

Thanks to all that posted.

--
Tailgunner
http://boat.nbrigham.com