[PSUBS-MAILIST] exotic steel

[Jon Wallace via Personal_Submersibles]

Hi Scott,

Check your numbers again just to be sure.  A 72 inch sphere has a volume 
of 113+ inches and will displace 7238 lbs of seawater. Using 1.25 inch 
material should weigh in around 5760 lbs giving you 1478 lbs of 
payload.  That still may not be enough payload depending upon equipment 
and superstructure material but is significantly more than 511 lbs.

I'm showing HY-80 gets you 3000 feet using 3/4 inch thickness and 3782 
lbs of payload, and HY-100 gets 3000 feet using 5/8 inch thickness and 
4358 lbs of payload.  Assuming you have to use 1" material you would 
still have 2620 lbs of payload.  Of course this assumes that the 
thinnest part of the hemisphere after forming is at least as thick as 
the required thickness for depth rating.

All these calcs are based on n=.8

Jon


On 5/1/2015 9:27 AM, via Personal_Submersibles wrote:
> Jon,
> The study I have shows a depth of 1000 meters with a shell thickness 
> of 1.19291 inches with a weight of 3676.05 lbs. When calculating the 
> displacement the total payload is 511.986 lbs. Ofcourse that 
> calculates for nothing but the sphere. Once you add 
> batteries, emergency drop weight, plumbing, recalculate for the shell 
> actually being 1.25" thick because of stock material, etc it becomes 
> grossly overweight.
> Thanks,
> Scott Waters
>
>     -------- Original Message --------
>     Subject: Re: [PSUBS-MAILIST] exotic steel
>     From: Jon Wallace via Personal_Submersibles
>     <personal_submersibles at psubs.org
>     <mailto:personal_submersibles at psubs.org>>
>     Date: Thu, April 30, 2015 6:45 am
>     To: Personal Submersibles General Discussion
>     <personal_submersibles at psubs.org
>     <mailto:personal_submersibles at psubs.org>>
>
>
>     I've calculated 1" thick 516-70 gets you 2000-3300 feet depending
>     upon
>     safety factor, with a weight of 4000 pounds.
>
>     2" thick 516-70 gets you 5000-6700 depending upon safety factor,
>     with a
>     weight of 9200 pounds.
>
>     Deepworker 2000 uses spherical segments welded together which
>     lightens
>     the shell because each segment is the same thickness. In traditional
>     forming of a hemisphere the metal will thin out at the apex and
>     you must
>     use that as your limiting factor in regards to max depth. So
>     spherical
>     segments get you to the same depth with lighter weight.
>
>     You might consider taking the C-Explorer approach and lighten the
>     overall weight by using a steel hemisphere for the bottom half and an
>     acrylic hemisphere for the top half.
>
>     Jon
>
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