[PSUBS-MAILIST] model testing

Tue Dec 30 18:52:25 EST 2014

Alan,
An engineering degree saves a lot of testing for sure, a computer program also saves a lot of testing.  In the absence of both, a model and pressure testing is the answer for me.  I really only want to test one area, so I don't have to make tiny t bars, :-)
Hank--------------------------------------------
On Tue, 12/30/14, Alan James 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: Tuesday, December 30, 2014, 3:10 PM

 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 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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