[PSUBS-MAILIST] K3000 spherical shell calculations

[Sean T. Stevenson via Personal_Submersibles]

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.

Sean


On 2014-04-16 23:41, Personal Submersibles General Discussion wrote:
> Hi again Jim , please have patience with me, either I am completely
> not thinking straight or we are talking apples and oranges ?
> 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
> What weight are you going to have to lift it with a crane?
> cheers
> Les
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