Re: [PSUBS-MAILIST] Need a machine part?

["Sean T. Stevenson" <cast55@telus.net>]

Do you mean the shape of the head would be easier to control with regard 
to flow over its surface underwater?  If that is the case, it might be 
cheaper to get the elliptical head, and then fabricate a superstructure 
/ outer hull to take care of the hydrodynamics.  This can be much 
thinner than your pressure hull.  Then again, the hemispherical head 
gives you more interior space to work with - provided you find a way to 
make effective use of it.  Really depends on the price difference.

-Sean


James Kocourek wrote:

> Thanks for the info,
>
> I am planning on at least 800 feet of depth and was also thinking that 
> the shape of the head will be much easier to control. If you have any 
> other thoughts please share as now is the time BEFORE I start buying 
> steel.
>
> Thanks,
>
> Jim K.
> ----- Original Message ----- From: "Sean T. Stevenson" <cast55@telus.net>
> To: <personal_submersibles@psubs.org>
> Sent: Thursday, May 04, 2006 11:31 AM
> Subject: Re: [PSUBS-MAILIST] Need a machine part?
>
>
> > Just wondering if you really need a hemispherical versus a 2:1 
> > semi-elliptical head?  The latter tends to be significantly cheaper 
> > to manufacture.
> >
> > Sorry, no sources, but a Google search for boilermakers, or pressure 
> > vessel heads should turn up something.
> >
> > -Sean





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