<HTML><HEAD></HEAD><BODY><font face="Courier New" size=2>If the
scale factor is 1:1 it shall
work.. :-0<BR></font><BR> vbr Carsten<BR><BR>"hank pronk via
Personal_Submersibles" <<A
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
schrieb:<BR>> <BR>> 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.<BR>> Hank --------------------------------------------<BR>>
On Mon, 12/29/14, Cliff Redus via Personal_Submersibles <<A
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
wrote:<BR>> <BR>> Subject: Re: [PSUBS-MAILIST] model
testing<BR>> To: "Personal Submersibles General Discussion" <<A
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><BR>>
Received: Monday, December 29, 2014, 3:06 PM<BR>> <BR>>
Drag<BR>> results between a model and full scale does not
scale<BR>> geometrically. You have to scale model and full
scale off<BR>> the dimensionless Reynolds number.
Reynolds number<BR>> scaling enables you to scale results between
model and full<BR>> scale using either a water tunnel or air<BR>>
tunnel.<BR>> Cliff<BR>> <BR>> <BR>> <BR>>
From: Alan James via<BR>> Personal_Submersibles<BR>> <<A
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><BR>>
<BR>> To: Personal<BR>> Submersibles General Discussion<BR>>
<<A
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
<BR>> <BR>> Sent: Monday,<BR>> December 29, 2014 1:55
PM<BR>> Subject: Re:<BR>> [PSUBS-MAILIST] model testing<BR>>
<BR>> <BR>> Hank,I just ran<BR>> a test on my pressure
program & you get the same crush<BR>> depthon a<BR>> sphere
of A516-70 steel that is 1000mm diameter & 10mm<BR>> thick as
youdo on a<BR>> sphere 100mm diameter & 1mm thick.What I
am<BR>> not sure of is if you can scale up the drag results on
a<BR>> model.If you<BR>> have a scale model that is 1/50th &
it takes X amount of<BR>> force to push<BR>> it at
3<BR>> knots, can you multiply X by 50 to get the required<BR>>
thrust?Alan<BR>> <BR>> <BR>> <BR>> From: Brian
Cox via<BR>> Personal_Submersibles<BR>> <<A
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><BR>>
<BR>> To: Personal<BR>> Submersibles General Discussion<BR>>
<<A
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
<BR>> <BR>> Sent: Tuesday,<BR>> December 30, 2014 8:43
AM<BR>> Subject: Re:<BR>> [PSUBS-MAILIST] model testing<BR>>
<BR>> <BR>> Hank,<BR>> I would
say<BR>> no. It would have to be so exact that it would
be<BR>> virtually impossible to extrapolate from the small
model,<BR>> and<BR>> aside from that I think there are other
engineering<BR>> principles involved that would come into play ,
Sean would<BR>> be the person to ask ! I know that it is done
in wave<BR>> tanks and wind tunnels, but in those you are looking
at<BR>> laminar flow and such things, not structural strength
so<BR>> much. You might be able to get a rough idea of how
it<BR>> would start to collapse maybe. The larger the model
the<BR>> better I would think.<BR>> <BR>> Brian<BR>>
<BR>> --- <A
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><BR>>
wrote:<BR>> <BR>> From: hank pronk via<BR>>
Personal_Submersibles <<A
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><BR>>
To: <A
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><BR>>
Subject: [PSUBS-MAILIST] model testing<BR>> Date: Mon, 29 Dec 2014
10:52:46 -<A href="callto:0800">0800</a><BR>> <BR>> Hi
all<BR>> If you<BR>> make a scale model of a submarine in
complete detail. <BR>> Scale the size and metal thickness, is
it a reasonable<BR>> representation of depth capabilities when
pressure<BR>> tested?<BR>> Hank<BR>>
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