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Re: [PSUBS-MAILIST] Hull Shaping Question

To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Hull Shaping Question
From: Rob Ossian <rob_neptune@yahoo.com>
Date: Mon, 27 Feb 2006 10:07:05 -0800 (PST)
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Hi George - Thanks for the feedback!

To clarify, the nose cone is to be attached to a more
traditional pressure hull.  Also, I was thinking that
since I will be using hull sheeting of either .25" or
3/5" thick sheeting I wanted to have the sheet bent to
form the cone shape, and then have it welded onto a
skeletal form for reinforcement.  Does this process
sound correct?

The skeletal form will actually be a slow taper from
about 3 feet wide to about 5 feet in total length
(think of two intersecting upside down V shapes with
hoops at various intervals).

Thanks,
Rob

--- George Slaterpryce <gslaterp@hotmail.com> wrote:

> 
> Why not make a standard preasure hull and then tack
> on a nose cone to that? 
> this way you get both the benefits of a solid
> preasure hull without adding 
> surface area and the streamlining affect of a
> foreward cone superstructure 
> for streamlining. You'll have a bit more weight
> forward to compensate for 
> but you can fix that relatively easily.
> 
> Machining? Putting your hull form on a lathe and
> machining it? I'm not 
> entirely certain how larger hulls are fabricated,
> the biggest hull I've made 
> so far was 12' long by 6' diameter and I did that on
> a lathe. The endcaps 
> where also done on a lathe. I doubt however that you
> can get a whole hull 
> the size needed for a human being machined like I do
> for my ROV project and 
> test pieces.
> 
> I'm sure someone else would know more about the
> process for larger hulls, I 
> just wanted to throw the "Keep the preasure hull and
> take on a streamlined 
> superstructure" idea out there. Just seems a lot
> safer to me.
> 
> George Slaterpryce
> ----- Original Message ----- 
> From: "Rob Ossian" <rob_neptune@yahoo.com>
> To: <personal_submersibles@psubs.org>
> Sent: Monday, February 27, 2006 11:50 AM
> Subject: [PSUBS-MAILIST] Hull Shaping Question
> 
> 
> >I have some questions about hull construction and
> was
> > hoping that some of y'all might be able to lend a
> > little assistance?
> >
> > The project I am working on is a shallow water sub
> > (designed for lake use, max lake depth is 200')
> and so
> > I am making a slightly pointed nose cone for the
> bow
> > of the sub.
> >
> > My questions are:
> >
> > - What is the terminology for the processes of
> > rolling a shaped hull?
> > - Does anyone out there have any experience in
> > producing such a nose cone shape?
> > - Since I will likely be outsourcing this part of
> the
> > assembly to an ASME certified welding shop (for
> safety
> > reasons) how could I best convey what I am trying
> to
> > achieve more coherently than I have above?
> > - Does anyone know of any other nose cone shaped
> subs
> > out there?
> >
> > Any help would be apreciated!
> >
> > Thanks,
> > Rob
> >
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References:
- Re: [PSUBS-MAILIST] Hull Shaping Question
  - From: "George Slaterpryce" <gslaterp@hotmail.com>

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