Re: [PSUBS-MAILIST] Design depth

[Shellydalg <shellydalg@aol.com>]

I think anyone seriously considering building a sub should also get a set of the K boat plane available from the PSUBS site, even if they aren't building a K boat. For a couple hundred bucks you get a whole set of plans and just by studying them you generate alot of questions and gain lots of insights into what makes a sub work.

The couple hundered bucks is very cheap considering how helpful having the info right there in front of you is, and most of the basic systems are the same regardless of what type of sub you eventually decide on.

A good library is priceless.

Frank D.

-----Original Message-----
From: Alan James <alanjames@xtra.co.nz>
To: personal_submersibles@psubs.org
Sent: Thu, Dec 9, 2010 9:11 pm
Subject: Re: [PSUBS-MAILIST] Design depth

Hi Jim,

I remembered the discussion but forgot the details.

I used to hear all the time on Psubs that you test your sub to twice your maximum

operating depth, unmanned, for an hour. This might not be a bad rule for home builders

who aren't going through a certification inspection process; & may be using blown domes

with their inherent stresses & weaknesses. Also there is the aging process that must weaken

the hull, that should be accounted for. I'm still looking at making my hull out of

fiberglass & there's a bigger margin of error required for that material.

Alan

 

----- Original Message -----

From: JimToddPsub@aol.com

To: personal_submersibles@psubs.org

Sent: Friday, December 10, 2010 12:31 PM

Subject: Re: [PSUBS-MAILIST] Design depth

Alan,

 

My design depth is 600 ft.  Operating depth is 300 ft.  Therefore required test depth would be 375 ft.  Failure depth must be slightly deeper than 600 ft.

 

What test depth would you consider to be best based on the above?  I would have thought 400 ft. which isn't much more than the standard.  We had an online discussion of this in early October.  I'll forward my last post which includes the comments of others.

 

Thanks,

Jim

 

In a message dated 12/9/2010 2:45:05 P.M. Central Standard Time, alanjames@xtra.co.nz writes:

Thanks,
that's a lot smaller margin than I thought, or would be happy with myself.
Alan
----- Original Message -----
From: "Jon Wallace" <jonw@psubs.org>
To: <personal_submersibles@psubs.org>
Sent: Friday, December 10, 2010 2:25 AM
Subject: Re: [PSUBS-MAILIST] Design depth


>
> I believe for certification ABS requires the sub to be tested to 25%
> above its maximum operating depth.  So if your max op depth is 100 feet
> they would require it to pass testing at 125 feet.
>
> On 12/9/2010 2:44 AM, Alan James wrote:
>> Does ABS or ASME state what your operational depth should be in
>> relation to your crush depth?
>> & if so is this different for the view ports.
>> I've read with fiberglass there is a 4x safety factor where human life
>> is concerned.
>> Alan
>
>
>
>
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