Re: [PSUBS-MAILIST] Introduction to new member

[Warren Greenway <opensourcesub@yahoo.com>]

I think you should consider a solid model and FEA. A
scale model is not a safe way to collect data, unless
it is backed up by further analysis. FEA gives you
more control, and will save you money. Are you
comfortable with any 3D CAD package? We are 
investigating FEA for the OSS project and a post was
made recently with links to FEA software.

Warren.
 
--- peter  mckellar <mckellar@earthlink.net> wrote:
> Hi All,
> 
> This is to introduce me to the group.
> 
> Im 44, and systems programmer (IBM mainframe world).
>  I live in Australia but
> frequently travel to Asia and the States.  Ive been
> diving since 1976 and 
> snorkelling or bodysurfing since before i can
> remember.  This doesn't mean I'm
> any good, it just shows my interests :)
> 
> I decided I would like to build a sub about 2 years
> ago, thought about it a lot
> and started researching about 3 mths ago - mostly
> lurking on PSUBS and archive
> searching.
> 
> Whilst an armchair PSUBS member at present, I hope
> to make the transition to the
> practical without losing too much of the idealism :)
> 
> As ideas form I hope to discuss them in the open
> forum of the PSUBS community, I
> am paranoid about safety so all input would be
> appreciated, but no responsibility
> is implied.  Once I have settled on a design, after
> discussion here etc, I plan
> to have a naval engineer and a boat designer smooth
> out any final flaws :)
> 
> As a first question to the group:  I am considering
> building a scale model and
> pressure testing it etc.  I figure than it should
> move as planned at scale, but
> will the pressure features of the hull scale
> correctly to the full sized sub?
> My concerns relate to the dynamics of materials
> being used when related to the
> various laws - eg boyles law shows a linear
> relationship to pressure increase,
> but does the hull material - with MoE, tensile
> stregth etc perform in a linear
> fashion when scaled down - or will i need to
> proportionally make the model hull
> thicker or thinner?
> 
> Thanks
> Peter Mckellar 


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