[PSUBS-MAILIST] K3000 spherical shell calculations

[Personal Submersibles General Discussion]

Les, the total mass of the trimmed-out craft will be exactly the
displacement volume of your proposed craft multiplied by the density of
seawater, if you expect to be neutrally buoyant.  Back of envelope
calcs:  a 2m sphere is 4.189 m^3, a cylinder 1.2m OD x 4m is 4.524 m^3,
for a total of 8.713 m^3. Multiplying by 1025 kg/m^3 (seawater density)
gives 8930.825 kg.  Subtract some for the common volume, add some for
superstructure, conning tower etc., but that's the ballpark.  Or are
your worried about the dry weight of the steel used in construction?

Sean


On 2014-04-15 23:25, Personal Submersibles General Discussion wrote:
> Hello everybody ,anybody, Les here ,
> Attatched myself to this email for convenience (similar subject) been
> away from psubs for quite some time wanting to start again.
> Now it might sound dumb, but I tried to follow the calc sheet for
> material and depth etc with ring stiffeners but ufortunately had a few
> problems, perhaps a sample calc attached to it would assist me and
> maybe others on how to use it correctly?
> In between time I do need to get a rough indication of the thickness
> of steel  and  approx size of  ring stiffener size and quantity, to
> roughly calculate the weight of what I wish to build, to see if what I
> want to do is feasible or not...WEIGHT IS CRITICAL for my project
> Can anyone help me please my reqirements are;
> A Sphere 2 meters diameter
> A Cylinder attached to that 1.2m diameter x 4meters long
>  ( I understand there will be a flaring attatchment to the sphere,
> however at this point for the exercise, just to calc the min weight
> that would be possible on these two items would be an indicator for me
> andd give me a mental appreciation of my limitations )
> The desired depth is 300m, ( 984ft ) ( 452 psi ) or I could settle for
> 250 meters( 820ft ) ( 379 psi ) both maximum dive depth not crush depth.
> Sorry to be  pain but can any-one help me
> Thank you
> Les
>  
> P.S. In for a penny in for a pound, guess I will make myself look
> completely dumb ....just as an indication, with something like the
> above how would I calculate the 
>         volume hence the size required for soft tanks for maximum
> submergance  
>  
>  

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