RE: [PSUBS-MAILIST] Alternative hull material

[Warren Greenway <opensourcesub@yahoo.com>]

No, you aren't off base. I will look forward to seeing
your progress. Remember, though, light isn't good with
a sub...And you can use that to your advantage. You
can
lay up nested structures using GRP, it will end up
over-
kill thick in some areas, but you can streamline it
from there. Just never forget that you structures must
stay evenly in compression. Good luck, and be careful!

Warren.

--- Tim Reilly <TimR@cclengineering.com> wrote:
> If anybody wants a real idea of what composites can
> do, go to the Deepflight
> web page and take a look at the Aviator.
>  
> http://www.deepflight.com
> <http://www.deepflight.com> 
>  
> As I am building my vehicle I will try to keep
> everybody updated on the
> tests that I am doing.  I will also be asking for
> people to act very
> negative (devil's advocate), so as to make sure if
> there is any aspect of
> testing that I might have forgotten.  
>  
> The main reason for the composites, is to get the
> vehicle the way I want it.
> I want a sub that is not only good looking but
> efficient, and I don't see
> that with traditionally shaped hulls and super
> structures.  I could be
> completely off base, we will see.  
>  
> It is going to be quite a while before I start
> building.  I am still in the
> research stage.
>  
> Thanks for your ear.
>  
> Tim R.
> 
> -----Original Message-----
> From: Thijs Struijs [mailto:thijs-struijs@planet.nl]
> Sent: Monday, March 17, 2003 1:08 PM
> To: PSUBS
> Subject: [PSUBS-MAILIST] Alternative hull material
> 
> 
> Michael (2x),
>  
> I considered building a sub out of GRP
> (glass-polyesther). This is easier to
> handle than kevlar-epoxy and a lot cheaper. I
> changed my mind because both
> materials have unknown specs. The strenght depends
> on a lot of factors such
> as the know-how of the builder, the quality of the
> resin, the way different
> types of cloth are used and so on.  It can be done
> of course, the LR5 is a
> good example. But for an amateur like me i thouhgt
> it would be far more
> simple and cheaper to use steel. When you use steel
> you can simply have a
> look in the books and find out how to make the
> details such as though-hulls,
> viewports and so on. 
>     
> Another problem is formed by the unknown decline of
> the material as a result
> of water pentrated in the laminate. This means that
> you can do an unmanned
> pressure test but you will never know in what
> condition it is after a view
> years. If you use A516 you can be sure that after a
> hundred years it's still
> the same A516 steel.  
>  
>  
> Thijs Struijs  
> 
> 


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