[PSUBS-MAILIST] model testing

Tue Dec 30 17:23:00 EST 2014

FEA (Finite Element Analysis)  is a comon way. 
We did it that way on Euronaut, Sgt.Peppers and the Eurosub class boats.

But if you have not a friend familary with this - maybe expensive.  
Ask students of a technical university..  

This link shows a detail of the diver exit hatch. 
http://www.euronaut.org/content/gfx/technic/3.jpg

Attachment is from Sgt.Peppers after installing the top hatch and before
the chamber pressure test. 
Conclusions was two more bars in the hatch. 
Boat survife the pressure test - with installed bars. 

vbr Carsten

"Alan James via Personal_Submersibles" <personal_submersibles at psubs.org>
schrieb: 
Hank,
I know you have a phobia here, but you could model it in a computer
if you bought a few programs!
After one Canadian winter locked inside for months, you'd probably start

enjoying it.
Alan

From: "Carsten Standfuß" via Personal_Submersibles"
<personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
<personal_submersibles at psubs.org> 
Sent: Wednesday, December 31, 2014 8:08 AM
Subject: Re: [PSUBS-MAILIST] model testing

If the scale factor is 1:1 it shall work.. :-0

 vbr Carsten

"hank pronk via Personal_Submersibles" <personal_submersibles at psubs.org>
schrieb:
> 
> I am not looking for drag comparisons, I am looking for failure due to pressure comparisons. I though I read that the Nekton subs were built as a model first to establish crush depth.
> Hank --------------------------------------------
> On Mon, 12/29/14, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Subject: Re: [PSUBS-MAILIST] model testing
> To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
> Received: Monday, December 29, 2014, 3:06 PM
> 
> Drag
> results between a model and full scale does not scale
> geometrically.  You have to scale model and full scale off
> the dimensionless  Reynolds number.   Reynolds number
> scaling enables you to scale results between model and full
> scale using either a water tunnel or air
> tunnel.
> Cliff
> 
>  
> 
> From: Alan James via
> Personal_Submersibles
> <personal_submersibles at psubs.org>
> 
> To: Personal
> Submersibles General Discussion
> <personal_submersibles at psubs.org> 
> 
> Sent: Monday,
> December 29, 2014 1:55 PM
> Subject: Re:
> [PSUBS-MAILIST] model testing
> 
> 
> Hank,I just ran
> a test on my pressure program & you get the same crush
> depthon a
> sphere of A516-70 steel that is 1000mm diameter & 10mm
> thick as youdo on a
> sphere 100mm diameter & 1mm thick.What I am
> not sure of is if you can scale up the drag results on a
> model.If you
> have a scale model that is 1/50th & it takes X amount of
> force to push
> it at 3
> knots, can you multiply X by 50 to get the required
> thrust?Alan
> 
> 
> 
> From: Brian Cox via
> Personal_Submersibles
> <personal_submersibles at psubs.org>
> 
> To: Personal
> Submersibles General Discussion
> <personal_submersibles at psubs.org> 
> 
> Sent: Tuesday,
> December 30, 2014 8:43 AM
> Subject: Re:
> [PSUBS-MAILIST] model testing
> 
> 
> Hank,
>       I would say
> no.  It would have to be so exact that it would be
> virtually impossible to extrapolate from the small model,
> and
> aside from that I think there are other engineering
> principles involved that would come into play , Sean would
> be the person to ask !  I know that it is done in wave
> tanks and wind tunnels, but in those you are looking at
> laminar flow and such things, not structural strength so
> much.  You might be able to get a rough idea of how it
> would start to collapse maybe.  The larger the model the
> better I would think.
> 
> Brian
> 
> --- personal_submersibles at psubs.org
> wrote:
> 
> From: hank pronk via
> Personal_Submersibles <personal_submersibles at psubs.org>
> To: personal_submersibles at psubs.org
> Subject: [PSUBS-MAILIST] model testing
> Date: Mon, 29 Dec 2014 10:52:46 -0800
> 
> Hi all
> If you
> make a scale model of a submarine in complete detail. 
> Scale the size and metal thickness, is it a reasonable
> representation of depth capabilities when pressure
> tested?
> Hank
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