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<div class="moz-cite-prefix">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?<br>
<br>
Sean<br>
<br>
<br>
On 2014-04-15 23:25, Personal Submersibles General Discussion
wrote:<br>
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<div><font face="Arial" size="2">Hello everybody ,anybody, Les
here , </font></div>
<div><font face="Arial" size="2">Attatched myself to this email
for convenience (similar subject) been away from psubs for
quite some time wanting to start again.</font></div>
<div><font face="Arial" size="2">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? </font></div>
<div><font face="Arial" size="2">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 </font></div>
<div><font face="Arial" size="2">Can anyone help me please my
reqirements are; </font></div>
<div><font face="Arial" size="2">A Sphere 2 meters diameter</font></div>
<div><font face="Arial" size="2">A Cylinder attached to that 1.2m
diameter x 4meters long</font></div>
<div><font face="Arial" size="2"> ( 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 )</font></div>
<div><font face="Arial" size="2">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.</font></div>
<div><font face="Arial" size="2">Sorry to be pain but can any-one
help me </font></div>
<div><font face="Arial" size="2">Thank you </font></div>
<div><font face="Arial" size="2">Les</font></div>
<div> </div>
<div><font face="Arial" size="2">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 </font></div>
<div><font face="Arial" size="2"> volume hence the size
required for soft tanks for maximum submergance </font></div>
<div> </div>
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