[PSUBS-MAILIST] Design Calculator Question

[Cliff Redus via Personal_Submersibles]

Ovidiu, the valve of 3578 is the volume of the Variable Ballast Tank
(VBT) in units of in^3 for this simple example psub.  The valve 13958 is
the volume of the Main Ballast Tank (MBT) in in^3.  For an actual psub, you
would need to determine these two values based on your boat design.  For
the example in iSub, the MBT is a straddle tank and this volume was
calculate using Autodesk Inventor for the part.  Likewise, the VBT is
assumed to be a small internal tank and the volume and CB calculated from
Inventor.  Both of these volumes are important in calculating the
displacement of the boat.

If you don't have a 3-D cad program like Solidworks or Inventor, then you
would estimate these volumes and their associated centers of buoyancy(CB).

Cliff


On Mon, Oct 31, 2016 at 1:57 AM, Ovidiu Anghelidi via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

> Hi there,
>
> I have a question regarding some of the values found in the spreadsheet
> iSub-Rev7-11-12.xls
>
> Where can I find the source for 3578, 13958.3983, 12^3?
> Cell: BuoyancyDB.C12   =$Main.D5 * (3578.47)/12^3
> Cell: BuoyancyDB.C13   =$Main.D5 * (13958.3983)/12^3
>
> Should these values be the same for all designs?
>
> Thank you.
>
> Best Regards,
> Ovidiu
>
>
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