[PSUBS-MAILIST] new sub project

Mon May 25 16:53:51 EDT 2015

I did some work on a 1 ATM suit, but it was more like the WASP suit, with no legs.  After several iterations, I decided that it wasn't quite dexterous enough to replace a wet diver, while at the same time being too limited in its advantages over a larger and more capable vehicle. By the time I actually build something, I expect to be quite a bit older... I want my sub to have comfortable bucket seats and coffee cup holders.

Sean

On May 25, 2015 2:09:12 PM MDT, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Hank, I share your interest in driving psubs designs smaller to make
>them easier to deploy, transport and fabricate. Sg.  Pepper is sill one
>of my favorite psubs.  I went through many design calcs on a design
>much like your describe with the ability of a small 1-atm central
>pressure hull to pivot relative to MBTs pods that remain horizontal
>while trying to meet constraints of ABS.  What I found is that ABS is
>not kind to small psubs like this.  I found that it was almost
>impossible to meet the minimum  GB-CG constraint without using mercury
>to radially shift CG on the fly which is against ABS rules. The other
>issue I found problematic is trying to meet the ABS minimum free board
>rule and the loss of surface stability on these designs if you retain
>the ability to rotate.  For these micro psubs, excessively tall humans
>like Sean (ha ha) kill surface stability when you get in and out in an
>emergency situation on the surface.  I think it is  possibly doable if
>you ignore ABS freeboard  and mercury rules. In the spirit of KISS,
>much beloved in Alec's new boat,  I finally gave up on trying to pivot
>the pressure hull and have been working on a small psub in which the
>pilot remains vertical and tilted forward but without the ability for
>the pilot to rotate the boat.  Batteries pods  hung low at
>the pilots feet generate very nice CG-CB spread  to enhance stability
>but make it harder to launch with conventional trailer arrangement. 
>Also without the ability to pivot, much like a scuba diver does is
>going from a surface orientation to a submerged orientation, visibility
>becomes an issue unless you live in Roatan.
>To me, there is lot of romance to designing and building a 1-atm self
>contained DIY psub much like the old JIM atmospheric body suits
>http://en.wikipedia.org/wiki/JIM_suit but it is not going to be easy. 
>Sean, at one time, I think I remember you being interested in designing
>a one atm. body suit.  Did you ever make any progress on this?
>Hank, at the speed you fabricate stuff, I suspect you will have all
>this sorted out and a boat in the water by time I finish this email. 
>Let us know how you come along with the concept.
>Cliff
>
>
>   
>
>From: hank pronk via Personal_Submersibles
><personal_submersibles at psubs.org>
> To: personal_submersibles <personal_submersibles at psubs.org> 
> Sent: Monday, May 25, 2015 3:10 PM
> Subject: Re: [PSUBS-MAILIST] new sub project
>   
>
>| Alec,
>Any ideas or criticisms are welcome.
>Hank |
>
> 
>
>  
>From:  Alec Smyth via Personal_Submersibles
><personal_submersibles at psubs.org>; 
>To:  Personal Submersibles General Discussion
><personal_submersibles at psubs.org>; 
>  Subject:  Re: [PSUBS-MAILIST] new sub project 
>  Sent:  Mon, May 25, 2015 12:28:28 PM 
>  
> 
>| Sounds good, tiny and light is a major plus - particularly as you
>have a boat that can get you to a dive site and over the side. 
>Alec
>On Sun, May 24, 2015 at 11:12 PM, hank pronk via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>
>Alec,
>I am not thinking flyer at all.  The water clarity would not support
>the speed.  I am thinking of a simple tiny light sub that can launch
>anywhere even off the deck of my boat.  It is just a though right now.
>
>For now I am enjoying my what seems gigantic bow dome.  The visibility
>is unbelievable, the modification cost and effort has been well worth
>it.  As a bonus, my payload is back to 500 lbs plus.  I had to fill the
>sub with steel plates to get it to sink.  :-)
>Hank  --------------------------------------------
>On Sun, 5/24/15, Private via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
> Subject: Re: [PSUBS-MAILIST] new sub project
> To: "Personal Submersibles General Discussion"
><personal_submersibles at psubs.org>
> Received: Sunday, May 24, 2015, 10:38 PM
>
> Indeed! Except mine went
> vertical only for emergency exit rather than as standard
> procedure.  It was not going to have any freeboard to speak
> of in vertical mode, so you would climb out in a hurry and
> watch her sink from under you. The method of going vertical
> was dropping the emergency weight, which was located at the
> very front. More than the front actually, it stuck out and
> constituted your crash bar. The sub was a "flyer",
> a poor man's Deep Flight. I had her 90% complete when I
> bought Snoopy, and the flyer project sat untouched for many
> years while Snoopy took up all my time and served as a
> classroom. The sub I'm finally finishing up now recycles
> the flyer hull, but redone to be conventional. Well,
> conventional in the sense of having ballast tanks and a
> conning tower - she's actually a pretty bizarre beast as
> the folks who come to the convention will see! My conclusion
> was that a flyer must be great fun but requires both
> unusually clear water and a vessel capable of laun!
>  ching the sub at the dive site. If I owned a
> mega yacht and cruised the Galapagos, a flyer would be just
> the thing. But what I'm aiming for now is radical
> simplicity, whereas the old one was all touch screens,
> servos, PLCs, and such.
>
> Best,
>
> Alec
>
>
>
> > On May 24, 2015, at 7:31 PM, Jon Wallace
> via Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
> >
> >
> > Talk to Alec, he was building such a
> design years ago before he acquired SNOOPY and ultimately
> decided against it...but I don't recall why.
> >
> >
> >> On 5/24/2015 6:31 PM, hank pronk via
> Personal_Submersibles wrote:
> >> Yes,
> you float it to the dock side, then tip it vertical to get
> in, close the hatch, tip it horizontal, and your away. 
> Saves building a CT that my 200lb sexy frame can fit into
> :-)
> >>
> Hank--------------------------------------------
> >
> >
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> |
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