Re: A sub question

[Ray Keefer <Ray.Keefer@eng.Sun.COM>]

Hi Richard,

I brought my ABS book to work with me today. The answer is found:

Page 3/4, Section 3.19 Buoyancy, Emergancy Ascent, and Stability, Subsection
"a" Intact Surface Stability. [Summarized.]

Must have at least one hatch.

Stablity must be that under the worst loading conditions (most weight carried)
you do not roll enough to ship water down your open hatch under sea state 3
conditions.

And, the minimum height from water line to hatch coaming can not be less then
2.5 feet.


If you want to be ABS certified you must comform to their specs. If you just
want to use the ABS specs as a guideline then you can fudge a bit. Personally
I will follow ABS specs as close as I can. In any case if you are seriously
into building your own submersible then the ABS book is well worth the money.

Regards,
Ray


> Hi Richard,
> 
> I have the book. It was something about not shipping water at some wave
> state. I don't remember if there was a minimum height or not. I'll
> look it up tonight.
> 
> Regards,
> Ray
> 
> > I have a specific question regarding subs which hopefully someone can
> > answer or direct me to the answer of.
> > 
> > What are the "freeboard" requirements or recommendations for a personal
> > sub?  I have some idea of what it "should" be but am interested in what
> > the ABS or other sanctioning organizations might have to say.  If anyone
> > has invested the $75 for the ABS book (I have not, yet!) please let me
> > know if it covers this.
> > 
> > The reason I ask is I am exploring a somewhat different design for a one
> > person sub which involves vertical (standing upright) ascents/descents
> > and a transition to horizontal (prone) once at depth (to a "Deep Flight"
> > style craft).  My idea is to minimize the cost of the structure and to
> > maximize streamlining at the same time.
> > 
> > Thanks for your help.
> 
>