[PSUBS-MAILIST] model testing

[Alan James via Personal_Submersibles]

Hank,I know you have a phobia here, but you could model it in a computerif 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 thescale factor is 1:1 it shall work.. :-0

 vbr Carsten



"hank pronk viaPersonal_Submersibles" <personal_submersibles at psubs.org>schrieb:
> 
> I am not looking for drag comparisons, I amlooking for failure due to pressure comparisons. I though I read thatthe Nekton subs were built as a model first to establish crushdepth.
> Hank --------------------------------------------
>On Mon, 12/29/14, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>wrote:
> 
> Subject: Re: [PSUBS-MAILIST] modeltesting
> 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 notscale
> geometrically.  You have to scale model and fullscale off
> the dimensionless  Reynolds number.  Reynolds number
> scaling enables you to scale results betweenmodel 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 1:55PM
> Subject: Re:
> [PSUBS-MAILIST] model testing
> 
> 
> Hank,I just ran
> a test on my pressureprogram & you get the same crush
> depthon a
> sphereof A516-70 steel that is 1000mm diameter & 10mm
> thick asyoudo on a
> sphere 100mm diameter & 1mm thick.What Iam
> not sure of is if you can scale up the drag results ona
> model.If you
> have a scale model that is 1/50th &it takes X amount of
> force to push
> it at3
> knots, can you multiply X by 50 to get the required
> thrust?Alan
> 
> 
> 
> From: BrianCox via
> Personal_Submersibles
> <personal_submersibles at psubs.org>
> 
> To: Personal
> Submersibles General Discussion
> <personal_submersibles at psubs.org>
> 
> Sent: Tuesday,
> December 30, 2014 8:43AM
> Subject: Re:
> [PSUBS-MAILIST] model testing
> 
> 
> Hank,
>       I wouldsay
> no.  It would have to be so exact that it wouldbe
> virtually impossible to extrapolate from the smallmodel,
> and
> aside from that I think there are otherengineering
> principles involved that would come into play ,Sean would
> be the person to ask !  I know that it is donein wave
> tanks and wind tunnels, but in those you are lookingat
> laminar flow and such things, not structural strengthso
> much.  You might be able to get a rough idea of howit
> would start to collapse maybe.  The larger the modelthe
> 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 201410:52:46 -0800
> 
> Hiall
> If you
> make a scale model of a submarine incomplete detail. 
> Scale the size and metal thickness, isit a reasonable
> representation of depth capabilities whenpressure
> tested?
> Hank
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