[PSUBS-MAILIST] K-600

[James Frankland]

Hi Jon,

Last time i ran the K350 on the spreadsheet, i got full collapse at
something like 1100ft.  From you comment there, maybe ive got it wrong?

On 24 October 2013 16:18, Jon Wallace <jonw at psubs.org> wrote:

>
> That must be due in large part to whatever is requested by the builder.  I
> believe ABS requires a sub only sustain 1.25 times the pressure of the
> requested rating however George appeared to feel better with a larger
> safety margin, 2x (+ or -).  If you run the numbers on the K350 for
> example, you'll see that it theoretically (by the numbers) survives to 800
> feet or so.
>
> Jon
>
>
>
> On 10/24/2013 10:38 AM, vbra676539 at aol.com wrote:
>
> PC-8 has 3/8" wall thickness on the hull cylinder, the same as the 600,
> but was rated 200 feet deeper by ABS, even though it has a larger radius
> (21" as opposed to 18"). The ring stiffeners on the 8 are external and the
> conning tower larger. Makes you wonder what the deal is for figuring
> operating depth. Perry went to half inch for PS-2 which was the same
> boat but rated at 1000'. Hmmm.
> Vance
>
>
>
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