I bought a higher grade of macro spheres. For sure a dunk test to
better than my
150 psi, and inspection after would be in order.
I am sure I can get rid of any trapped air with 1/8" holes. A
simple cap top an bottom
would allow me to add or subtract buoyancy. The spheres run from
1/4 to 3/8 dia.
Another reason for thinking on this is changes in the future.
Adding equipment and
other changes would be simplified if I make the containers larger
than I need. And making several to adjust
trim.
Dean
In a message dated 4/23/2010 3:17:59 P.M. Central Daylight Time,
jonw@psubs.org writes:
Sorry, I misread your original post. So you're thinking of
just putting
the macro-spheres in a free flooding container, no binder at
all. Other
than a deep water test to ensure the rating of 250psi is
accurate, you
might also consider the effects of any trapped air that
might occur
between the spheres deep within the container. I have no
idea if there
would none, some or lots, but any air that does get trapped
it compress
and vary your buoyancy. Of course this may not be enough
to worry about
but just something to keep in the back of your
head.
Also Dean, do the "winnowing" as recommended by Cliff (slide 14
in
syntactic foam slide set) to get rid of any spheres that might be
malformed or broken.
Jon
Recon1st@aol.com
wrote:
> *Jon and Frank. The spheres I have are rated to 250psi with
100%
> survival.*
> *I am thinking that with out the binder and
microspheres they should
> do the job.*
> *The abrasion is a
thought but they are tough little buggers, can't
> imagine that
being*
> *a concern. *
> **
> *I can picture even pressure
around each sphere except for it's
> buoyancy, and those *
>
*below it. *
> **
> *Dean*
>
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