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<div class="moz-cite-prefix">Les, the crane weight of the completed
sub will necessarily be the full dead weight of the vessel in
service, which is displacement volume multiplied by the density of
seawater. Of course, you can lessen this by ballasting once the
vessel is launched / slipped to the water (provided it has
sufficient stability in that condition), in which case the crane
weight will be the weight of the hull material, superstructure,
permanently installed systems etc. - everything except crew,
consumables, mobile equipment and free ballast, but you will need
to figure that on the basis of your specific design. To calculate
just the material weight of your hull components, you can use the
volume formulas I included in another post, multiplied by the
density of the steel or your selected material. Stiffener webs
and flanges are just cylindrical shells.<br>
<br>
Sean<br>
<br>
<br>
On 2014-04-16 23:41, Personal Submersibles General Discussion
wrote:<br>
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<div>Hi again Jim , please have patience with me, either I am
completely not thinking straight or we are talking apples and
oranges ?</div>
<div>I am talking about dry air surface land weight , you make a
cylinder out of 3/4" steel plate 1.2m diam 4m long with same
material end caps </div>
<div>What weight are you going to have to lift it with a crane?</div>
<div>cheers </div>
<div>Les</div>
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