My answer to this debate would to be to review history. If
the free-sphere method was practical wouldn’t you think it would be
prevalent throughout industry as being more economical? Since it is
not found at all as far as I know then syntactic foam should be
considered. You can waste a lot of money trying to save some dollars or
cause yourself a lot of frustration further down the road.
R/Jay
Respectfully,
Jay K. Jeffries
Andros Is., Bahamas
A skimmer afloat is but a submarine, so poorly built it will not
plunge.
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of djackson99@aol.com
Sent: Monday, April 23, 2007 12:22 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Glass microspheres idea
Thanks Rob
Avoiding the epoxy increases the buoyancy and
decreases the cost and make it easier to build to a custom shape that can be
easily detached from the structure. The
water pressure will be equal on all sides of the container, the walls of the
container will push against the 10000 psi spheres
and the air between the spheres is prevented from
compressing and hence provides more buoyancy.
The assumption I am making is that 10000 psi
glass bubbles can survive at least 1500 psi when the load is applied through
the wall contact points with their neighbors. --Doug J
-----Original Message-----
From: Sundiver2000@earthlink.net
To: personal_submersibles@psubs.org
Sent: Sun, 22 Apr 2007 1:00 PM
Subject: Re: [PSUBS-MAILIST] Glass microspheres idea
Wow. Rube Goldberg would love it. Seriously though, why the
extensive effort to avoid syntactic foam? Syntactic foam is microspheres in epoxy. If you put them in a container
with air spaces between them, they won't be incompressible. The housing would
have to support itself. Why not use foam?
Rob
djackson99@aol.com wrote:
> Sorry for not being clear; yes I am thinking of building floats. The >
idea is to have an easy syntactic foam replacement that takes > advantage of
the higher psi glass bubbles and offsets their higher > density by just
filling a fiberglass container with them instead of > adding them to a epoxy
resin as normally done from creating syntactic > foam.
>
> To build the container, you could cut styrene foam to fit your hull >
shape and desired external shape, then cover the styrene foam with a >
durable layer of fiberglass. You might want to embed aluminum > sheeting for
armor, especially on the external side but also for > mounting tabs that
will make it easy to bolt the float onto the hull. > Then drill a hole
through the fiberglass; dissolve the styrene foam > with acetone; refill the
container with glass bubbles; and seal the > hole. >
> --Doug J
> www.submarineboat.com
> > > -----Original Message-----
> From: emile@airesearch.nl
> To: personal_submersibles@psubs.org
> Sent: Sun, 22 Apr 2007 2:37 AM
> Subject: RE: [PSUBS-MAILIST] Glass microspheres idea
>
> Doug,
> > (most of) The space will be consumed. Is your idea only for buoancy > reason??
> > Regards, Emile
> > ------------------------------------------------------------------------
> *Van:* owner-personal_submersibles@psubs.org > <_javascript_:parent.ComposeTo("owner-personal_submersibles%40psubs.org", > "");>
[mailto:owner-personal_submersibles@psubs.org > <_javascript_:parent.ComposeTo("owner-personal_submersibles%40psubs.org", >
"");>] *Namens *djackson99@aol.com > <_javascript_:parent.ComposeTo("djackson99%40aol.com",
"");>
> *Verzonden:* zondag
22 april 2007 6:58
> *Aan:* personal_submersibles@psubs.org > <_javascript_:parent.ComposeTo("personal_submersibles%40psubs.org",
"");>
> *Onderwerp:* [PSUBS-MAILIST]
Glass microspheres idea
> > I was wondering about using glass microspheres
and air as a filler in > a fiberglass compartment. For example, build a figerglass tank, then > fill it with 10,000 psi
glass bubbles and seal it off. I know each > sphere would be loaded at
points of contact with it neighbors but I > seems like it would work to at
least 3000 ft. >
> Please let me know what you think.
>
> Here is a link to 3M's Selection Guide:
> http://multimedia.mmm.com/mws/mediawebserver.dyn?FFFFFFoMYRUF&i2Fsi2FFFSzlqBeeeeD- > <http://multimedia.mmm.com/mws/mediawebserver.dyn?FFFFFFoMYRUF&i2Fsi2FFFSzlqBeeeeD-> >
>
> Doug J
> Tulsa, Ok
> www.submarineboat.com
<http://www.submarineboat.com>
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