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<div class="moz-cite-prefix">Hi Scott,<br>
<br>
Check your numbers again just to be sure. A 72 inch sphere has a
volume of 113+ inches and will displace 7238 lbs of seawater.
Using 1.25 inch material should weigh in around 5760 lbs giving
you 1478 lbs of payload. That still may not be enough payload
depending upon equipment and superstructure material but is
significantly more than 511 lbs.<br>
<br>
I'm showing HY-80 gets you 3000 feet using 3/4 inch thickness and
3782 lbs of payload, and HY-100 gets 3000 feet using 5/8 inch
thickness and 4358 lbs of payload. Assuming you have to use 1"
material you would still have 2620 lbs of payload. Of course this
assumes that the thinnest part of the hemisphere after forming is
at least as thick as the required thickness for depth rating.<br>
<br>
All these calcs are based on n=.8<br>
<br>
Jon<br>
<br>
<br>
On 5/1/2015 9:27 AM, via Personal_Submersibles wrote:<br>
</div>
<blockquote
cite="mid:20150501062741.49e8347f125ba4e1b2aff75c01b07c1e.43625c2532.wbe@email13.secureserver.net"
type="cite"><span style="font-family:Verdana; color:#000000;
font-size:10pt;">
<div>Jon,</div>
<div> </div>
<div>The study I have shows a depth of 1000 meters with a shell
thickness of 1.19291 inches with a weight of 3676.05 lbs. When
calculating the displacement the total payload is 511.986 lbs.
Ofcourse that calculates for nothing but the sphere. Once you
add batteries, emergency drop weight, plumbing, recalculate
for the shell actually being 1.25" thick because of stock
material, etc it becomes grossly overweight.</div>
<div> </div>
<div>Thanks,</div>
<div>Scott Waters </div>
<div> </div>
<blockquote id="replyBlockquote" style="FONT-SIZE: 10pt;
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<div id="wmQuoteWrapper">-------- Original Message --------<br>
Subject: Re: [PSUBS-MAILIST] exotic steel<br>
From: Jon Wallace via Personal_Submersibles<br>
<<a moz-do-not-send="true"
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Date: Thu, April 30, 2015 6:45 am<br>
To: Personal Submersibles General Discussion<br>
<<a moz-do-not-send="true"
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
<br>
<br>
I've calculated 1" thick 516-70 gets you 2000-3300 feet
depending upon <br>
safety factor, with a weight of 4000 pounds.<br>
<br>
2" thick 516-70 gets you 5000-6700 depending upon safety
factor, with a <br>
weight of 9200 pounds.<br>
<br>
Deepworker 2000 uses spherical segments welded together
which lightens <br>
the shell because each segment is the same thickness. In
traditional <br>
forming of a hemisphere the metal will thin out at the apex
and you must <br>
use that as your limiting factor in regards to max depth. So
spherical <br>
segments get you to the same depth with lighter weight.<br>
<br>
You might consider taking the C-Explorer approach and
lighten the <br>
overall weight by using a steel hemisphere for the bottom
half and an <br>
acrylic hemisphere for the top half.<br>
<br>
Jon<br>
<br>
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