[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PSUBS-MAILIST] Brass vs. Bronze



Actually what separates flesh from fish on Hawke's
Deep flight 1 is four inches of fiberglass hull. A
staff of engineers and volunteers wound it in a
continuous monofilament wrap around a 26-inch-diameter
cylindrical mandrel.  

Pretty nifty thing to watch the thing slowly spin
around like an old Ediphone record maker...
 
--- Andy Jensen <drewacard@charter.net> wrote:

> Bill it is not a crazy idea Deep Flight 502 was cast
> of Al i think it is like an  inch and a half thick
> only fits one person per pod. but it has been done.
> Andy J.
> 
> ---- Akins <lakins1@tampabay.rr.com> wrote: 
> Hi Sean.
> 
> You make a lot of sense and good points. Oh well, it
> was just a conceptual idea anyway.
> I guess if it was a good method to use, it would
> already be in use. Just another crazy idea of mine.
> Bill Akins.
> 
> 
>   ----- Original Message ----- 
>   From: Sean T. Stevenson 
>   To: personal_submersibles@psubs.org 
>   Sent: Tuesday, April 11, 2006 5:36 PM
>   Subject: Re: [PSUBS-MAILIST] Brass vs. Bronze
> 
> 
>   While certainly possible, I think that there are a
> few practical 
>   limitations to casting a submarine hull.  The
> obvious one is size - you 
>   need to cast the entire thing in one continuous
> pour, necessitating a 
>   foundry with that melt capacity.  The second is
> quality control - 
>   porosity is much more difficult to avoid in
> casting than it is in weld 
>   beads - once cast, every square inch of the hull
> would need to be 
>   examined through non-destructive testing (x-ray,
> ultrasound, etc.), as 
>   opposed to just weld seams, and then if you do
> find a problem, you may 
>   have to scrap the whole thing and re-cast if it is
> not in an area that 
>   is easily patchable.  The third is dimensional
> control - save for the 
>   ideal case where you cast a perfect cylinder with
> no hull penetrations, 
>   bosses, stiffeners, etc., variable cooling rates
> due to material 
>   distribution within the cast will cause the
> finished casting to deviate 
>   from the original pattern.  Ordinarily, foundries
> will account for this 
>   by modifying the pattern to compensate
> (guesstimating), or by working 
>   the finished castings in presses, etc. to bump
> them back into 
>   compliance.  For commonly cast parts like pump
> housings, etc., this is 
>   no big deal, but pressure vessels are somewhat
> more dependent on their 
>   geometry for proper function.  This is not to say
> that it couldn't be 
>   done, but my gut instinct is that it would be cost
> prohibitive, as well 
>   as a lot of work.
> 
>   -Sean
> 
> 
> 
>
************************************************************************
>
************************************************************************
>
************************************************************************
> The personal submersibles mailing list complies with
> the US Federal
> CAN-SPAM Act of 2003.  Your email address appears in
> our database
> because either you, or someone you know, requested
> you receive messages
> from our organization.
> 
> If you want to be removed from this mailing list
> simply click on the
> link below or send a blank email message to:
> 	removeme-personal_submersibles@psubs.org
> 
> Removal of your email address from this mailing list
> occurs by an
> automated process and should be complete within five
> minutes of
> our server receiving your request.
> 
> PSUBS.ORG
> PO Box 311
> Weare, NH  03281
> 603-529-1100
>
************************************************************************
>
************************************************************************
>
************************************************************************
> 
> 




************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 311
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************