[PSUBS-MAILIST] Drawing of my 2-man sub

Thu Feb 19 10:43:27 EST 2015

Hi Andre.

your drawing looks great! hope you post pictures when you start building.

May i ask which company that rolls the steel for you? :)

Håvard.

2015-02-19 16:28 GMT+01:00 André Eriksen <personal_submersibles at psubs.org>:

> Emile
>
> My FEA analysis shows that you are right, I have already upgraded the
> nozzle thickness.
>
> Anders
>
> Thanks for good advice. Don`t have the room for a diesel. Would be fun
> to have a look on your sub, it`s not a long drive from Norway.
>
> 2015-02-19 11:48 GMT+01.00, Anders Ljung via Personal_Submersibles
> <personal_submersibles at psubs.org>:
> > Hello
> >
> > I built and operated the submarine Malen and used it in the baltic sea.
> > This boat was 10 tons and 10.5 meters long and had some 1+ meter
> freeboard.
> > Still there where times when i got alot of the baltic sea in my head when
> > driving surfaced. High freeboard is esential if operating in open sea.
> > I would also recomend some kind of combustion engine onboard if operating
> > in the sea , to battle waves and current some 2-3 kw per ton is nice to
> > have
> > A small marine diesel is a fantastic resource to have onboard plus its
> more
> > fun and ads to the design challenge. If operating in the sea the boat
> will
> > run the best
> > with main ballast tanks mounted fore and aft according to my experiance.
> > However these are my personal opinions and they might be completly wrong
> :)
> >
> > Anders Ljung
> >
> > 2015-02-02 21:55 GMT+01:00 André Eriksen <
> personal_submersibles at psubs.org>:
> >
> >> Thank you for the input Alec.
> >>
> >> I got a quote some time ago on the hemispheres.. around 1800 USD for the
> >> both.
> >>
> >> Have had the concern of distorted visibility with the acrylic dome, but
> >> thought it would be allright since I never have heard complaints on it.
> I
> >> might look into going with a taller tower and flat viewports. More
> >> freeboard and better visibility quality is not a bad thing. My center of
> >> gravity and bouyancy calculations show I have some flexibilty there.
> >>
> >> André
> >>
> >>
> >>
> >> 2015-01-31 14:43 GMT+01:00 hank pronk via Personal_Submersibles <
> >> personal_submersibles at psubs.org>:
> >>
> >>> Andre,
> >>> I have a sub with an acrylic cylinder for the CT and the visibility is
> >>> fantastic,
> >>> Hank
> >>> --------------------------------------------
> >>> On Fri, 1/30/15, Alec Smyth via Personal_Submersibles <
> >>> personal_submersibles at psubs.org> wrote:
> >>>
> >>>  Subject: Re: [PSUBS-MAILIST] Drawing of my 2-man sub
> >>>  To: "Personal Submersibles General Discussion" <
> >>> personal_submersibles at psubs.org>
> >>>  Received: Friday, January 30, 2015, 10:27 PM
> >>>
> >>>  Hi
> >>>  Andre,
> >>>  Very nice drawing and
> >>>  concept, I like the simplicity and it looks balanced. I
> >>>  would have the following observations:
> >>>  - Check that you can actually get
> >>>  those hemispherical heads for a reasonable price.
> >>>  Hemispherical heads are far less common than elliptical. I
> >>>  was once shopping for endcaps and got the following quote:
> >>>  "The elliptical is $300, the hemispherical is $300 plus
> >>>  $4000 in tooling setup costs".
> >>>  - Regarding the coning tower design
> >>>  (K250 in this case) it depends what you want the sub for.
> >>>  The problem with that tower is the low freeboard, which is
> >>>  fine for lakes but insufficient for open water. You cannot
> >>>  open a K250 hatch in the ocean in anything but flat calm
> >>>  conditions. Also, visibility out of a K250 dome hatch is not
> >>>  good, even though that might sound counter-intuitive. You
> >>>  are looking through the side of a dome, which means poor
> >>>  optics. The bow dome visibility will be wonderful, because
> >>>  you're looking through the apex. Or, of course,
> >>>  visibility of the surface will be good from the
> >>>  coning tower, but one only uses that upon
> >>>  surfacing.
> >>>  - I would
> >>>  not worry too much about the boat being top heavy. In
> >>>  general, between low drop weights, low batteries, and high
> >>>  MBTs these little boats are extremely stable. You should be
> >>>  able to carry a significantly taller tower than that one
> >>>  given the hull beneath it. I'm not saying you should
> >>>  skip the stability calculations, I'm just saying I think
> >>>  you will find that the calculations prove you can carry a
> >>>  higher tower that will allow for flat viewports and increase
> >>>  freeboard. Another option is to put a cylindrical viewport
> >>>  on the K250 tower to bump it up. I haven't done that
> >>>  myself, but it could be done.
> >>>  Best,
> >>>  Alec
> >>>  On Fri, Jan 30, 2015 at
> >>>  11:42 AM, André Eriksen <personal_submersibles at psubs.org>
> >>>  wrote:
> >>>  Hi
> >>>  guys!
> >>>  Finally I can
> >>>  start building. Just rented a nice location outside town.
> >>>  This is the drawing of the sub. I want to have 400meters
> >>>  (1300ft) of max operating depth. The hull is 10mm
> >>>  (3/8") S355J2 steel. The ABS hull calculator is giving
> >>>  me 431,8m (1417ft) of depth, and 638,4m (2094ft) crush
> >>>  depth. Still have som FEA to do. Have to learn to use a new
> >>>  software since Autodesk Inventor don`t simulate buckling.
> >>>  Any thoughts on the design?Do someone want to
> >>>  confirm my calculations?Very excited to get
> >>>  started!Sorry for the metric dimensions for you
> >>>  who are not custom to them.
> >>>  I had a hard time figuring out the
> >>>  conning tower. I wanted it to go in one piece, but I want
> >>>  all the freeboard I can get and not get it too top heavy.
> >>>  Was thinking about going 20mm thick nozzle all the way up,
> >>>  but thinking I might get in trouble welding in the hatch
> >>>  seat ring. With 30mm I could do without welding in a seat
> >>>  ring, but it would be too top heavy. So decided to go with
> >>>  the Kittredge design, any thoughts on this?
> >>>  Domes in top and front and saddle
> >>>  tanks.
> >>>  Emile:
> >>>  If you still want to press domes for me, can you give me the
> >>>  exact measurements I should have for the bow
> >>>  ring?
> >>>  -André
> >>>
> >>>
> >>>
> >>>
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> >>>
> >>>
> >>>
> >>>
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> >>
> >>
> >>
> >> --
> >> Med Vennlig Hilsen / Regards
> >> *André Eriksen*
> >>
> >> _______________________________________________
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> >>
> >>
> >
>
>
> --
> Med Vennlig Hilsen / Regards
> *André Eriksen*
>
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