[PSUBS-MAILIST] publicity

[Rick Patton via Personal_Submersibles]

Jon,
Are you talking about test or crush depth on the 350?
Rick

On Thu, Jun 18, 2020 at 2:50 AM Jon Wallace via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

>
> I ran the numbers again in the calculator and got the same numbers.  If I
> change the usage factor to 1.0 then I get 884 feet.  I suppose when trying
> to ascertain a theoretical crush depth a usage factor of 1.0 would be
> acceptable in the calculator.  It's been my understanding that ABS, Lloyds,
> etc, look for a safety factor of about 1.5 which would put the 350 at 525
> feet.  That may explain the 600 foot test depth you mentioned, but even so,
> my opinion is that's overkill.
>
> Jon
>
> On 6/17/2020 1:25 PM, Rick Patton via Personal_Submersibles wrote:
>
> Jon
>
> OK sounds good. I was asking for the crush depth of a K-350 and the
> unmanned test depth for one hour is 600' so that doesn't sound correct.
> Someone told me a while ago that Ketteredge had put a 350 when first
> developed in a hyperbaric chamber that was only rated for 1,200 and pushed
> it down to that depth to see if it could take that pressure without
> imploding and nothing happened so he knew that that design would survive at
> least to that depth without failure. Can't remember who told me that but
> does anyone know if that story is correct?
>
> Rick
>
> On Wed, Jun 17, 2020 at 4:13 AM Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Just point them to the website Rick, if they ask.  There's a link to
>> facebook from there.
>>
>> I get 665 feet for the pressure cylinder and 576 feet for the hull caps,
>> but those are theoretical best case limits.  So 500-600 feet would be a
>> fair statement.  Given all the fabrication variables there is no way to
>> predict a specific depth which is why we use safety margins.
>>
>>
>>
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