Re: [PSUBS-MAILIST] Hull material

[Robert Ossian <rob_neptune@yahoo.com>]

Very good points, but but I am looking to make a sub
that is by design very postively bouyant so that a
manually released drop weight will guarrantee a safe
surfacing in case every other saftey measure fails. 
Plus, my dry compartment is (to put it kindly) tiny.

Thanks for your input though - This is exactly the
kind of input that makes PSUBS such a great source of
info.

/Rob

--- Paul Kreemer <paulkreemer@gmail.com> wrote:

> Robert, just one comment regarding the weights.  It
> sounds like you're
> considering the weight of aluminum as a negative
> feature when compared to
> the weight of composites.  But really, in many sub
> designs some additional
> weight is required to get the boat neutrally
> buoyant.  Another way to put
> this is: any weight saved in building a design in
> composites will need to be
> added back in as ballast.
> 
> A 50cf dry compartment will have a buoyancy of
> 3200lbs (50cf * 64lb/cf).
> When ready to dive with crew and all aboard the boat
> will need to weigh more
> than 3200lbs to actually sink!  A lot of sub designs
> are more like strong,
> heavy balloons than aircraft.  That might be a
> little stretch of the analogy
> but it gives a general idea.  :-)
> 
> take care-
> Paul
> 
> 
> On 12/27/05, Robert Ossian <rob_neptune@yahoo.com>
> wrote:
> >
> > I am in the very early process of designing a sub
> that
> > will have a maximum depth of about 200-250 feet
> and
> > have been wondering if there are any experienced
> > opinions about using composite materials (enhanced
> > fiberglass) as a hull material?  The obvious
> benefits
> > are that it could be custom moulded to my
> > designs/shapes and of course rust-proof.
> >
> > I have thought about using Aluminum, but the
> inherent
> > weight and the fact that Aluminum would be
> > (relatively) more expensive, I am looking to
> explore
> > alternative materials (any suggestions are
> welcome).
> >
> > Any thoughts?
> >
> >
> >
> >
> > __________________________________________
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> >
> >
> >
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