Dan,
Do you recognize your ballast tanks? http://www.frappr.com/?a=myfrappr&id=269116
Straight from the pictures you sent me.
Thanks again
Joe
From: "Dan H." <jmachine@adelphia.net>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] TANK / PSI QUESTION
Date: Mon, 13 Feb 2006 08:11:24 -0500
>Sean,
>
>Very well put, in both your last postings. For examples, one can
>look at anything from building design to machine design. We still
>use the same basic materials for construction (with some exceptions)
>but engineering has been constantly refining things into more and
>more tighter designs. Smaller, lighter and more efficient.
>
>An amateur welders motto: If you not sure about your "first pass,
>lay on a few more." Not necessarily a good idea ,but it feels
>comforting.
>
>Dan H.
>----- Original Message ----- From: "Sean T. Stevenson"
><cast55@telus.net>
>To: <personal_submersibles@psubs.org>
>Sent: Sunday, February 12, 2006 11:04 PM
>Subject: Re: [PSUBS-MAILIST] TANK / PSI QUESTION
>
>
>>Well, I wouldn't go so far as to say that a gut feeling can replace
>>engineering calculations. Certainly, as problems get more
>>complicated (with more variables, complicated geometries,
>>materials, etc.) they tend to become less intuitive, and in any
>>case, prudence demands proper diligence with respect to design
>>effort; however, "that looks about right" often is, and will serve
>>as a good check against calculation errors.
>>-Sean
>>
>>
>>Joseph Perkel wrote:
>>
>>>
>>>Well now.....if I read you correctly Sean this quote:
>>>
>>>/"In engineering design, for example, we design a part to
>>>withstand V amount of force, plus or minus W, X % of the time,
>>>with Y probability of failure after Z hours in service - there are
>>>no absolutes." /
>>>
>>>//
>>>
>>>Is the _formula_ for...."*That looks about right"! *
>>>
>>>and explains this:
>>>
>>>/"Hobbyist projects are often impressive simply because they
>>>incorporate engineering overkill that you just don't see in
>>>commercial projects."/
>>>
>>>I have never seen it explained quite so clearly, and it would seem
>>>that, that is the common ground we share (amateurs) with you
>>>professionals.
>>>
>>>Thanks Sean!
>>>
>>>Joe
>>>
>>
>>
>>
>>
>>
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>
>
>
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