Re: [PSUBS-MAILIST] double endcaps sub, stability

[Warren Greenway <opensourcesub@yahoo.com>]

I got the attachment. Thanks! It is looking logical,
I'll review it further.

Warren.

--- Thijs Struijs <thijs-struijs@planet.nl> wrote:
> 
> Warren,
> 
> It was a suggestion from Alec Smith about half a
> year ago to place the
> vertical thrusters under an angle like on Phil's
> subs. This might give you
> the freedom to move sideways. Another advantage is
> that you stay level when
> you got up or down. A single thruster in the front
> also disturbes the
> sediment right in front of the viewport.
> 
> The attachment was an Excel file. I will give it
> another try . It is a
> "calculation" of the subs stability. I am not an
> expert on this but i used
> my commom sense. The center of the pressure hull is
> the 0,0,0, point. I hope
> it makes some sense to you.
> 
> If i paste it in this mail the file is completely
> disturbed. I will send it
> in a separate mail.
> 
> Greatings,
> Thijs Struijs
> 
> 
> ----- Original Message -----
> From: "Warren Greenway" <opensourcesub@yahoo.com>
> To: <personal_submersibles@psubs.org>
> Sent: Tuesday, November 04, 2003 5:14 PM
> Subject: Re: [PSUBS-MAILIST] double endcaps sub,
> stability
> 
> 
> > No, I'm afraid I didn't recieve the attachment.
> What
> > was it? By the way, I noticed the improved
> vertical
> > thruster positions. Very nice, I was concerned
> about
> > having a vertical thruster at the bow, for
> stability
> > reasons. I wonder how it will handle with the
> > thrusters
> > at an angle? If it works, the two thrusters would
> > allow
> > more freedom of movement, since you could "creep"
> from
> > side to side as you adjusted your depth.
> >
> > Warren.
> >
> > --- Thijs Struijs <thijs-struijs@planet.nl> wrote:
> > > Warren,
> > >
> > > Thanks for the compliment. The idea of placing
> the
> > > batteries for and aft is
> > > a good one. I will have a look at it.
> > > By the way, did you receive the attachment?
> > >
> > > Greatings,
> > > Thijs Struijs
> > >
> > > ----- Original Message -----
> > > From: "Warren Greenway"
> <opensourcesub@yahoo.com>
> > > To: <personal_submersibles@psubs.org>
> > > Sent: Monday, October 27, 2003 5:16 PM
> > > Subject: Re: [PSUBS-MAILIST] double endcaps sub,
> > > stability
> > >
> > >
> > > > I am really falling in with this line of
> thought.
> > > I
> > > > can see now that the design is more flexible
> with
> > > the
> > > > batteries outside the hull. I am wondering,
> > > though, if
> > > > we shouldn't place the batteries fore and aft
> a
> > > little
> > > > lower on the pressure hull to improve
> stability. I
> > > was
> > > > originally thinking along side the hull, but I
> do
> > > > prefer your idea of keeping the hull thin and
> > > sleek.
> > > > (By the way, this has to be one of the nicest
> > > looking
> > > > subs I've seen!)
> > > >
> > > > Warren.
> > > >
> > > > --- Thijs Struijs <thijs-struijs@planet.nl>
> wrote:
> > > > > Warren,
> > > > >
> > > > > I have tried to place the batteries inside
> the
> > > > > pressurehull. I sat in my
> > > > > mock-up (a frame made out of plastic tubes)
> and
> > > > > tried to find a place for
> > > > > the batteries (carton boxes). I did not
> succeed.
> > > So
> > > > > now i want to place them
> > > > > behind the pressurehull. This has the
> advantage
> > > that
> > > > > the profile of the sub
> > > > > stays slim.  I want to use two 85 AH
> batteries
> > > for
> > > > > the Endura 30 Minn
> > > > > Kota's. There are 4 off them, 2 horizontal
> and 2
> > > > > vertical under a 45 dgr.
> > > > > angle.
> > > > >
> > > > > Placing the batteries behind the pressure
> hull
> > > made
> > > > > me worry about the
> > > > > stabiliy. But when you look at an avarage
> car
> > > > > battery, and you look at the
> > > > > volume (= buoyancy) compared to the weight
> they
> > > are
> > > > > not that heavy at all.
> > > > > Anyway i made some "calculations" which i
> will
> > > try
> > > > > to send as an attachment.
> > > > > About some things i had to make a guess but
> most
> > > > > figures are extracted from
> > > > > the 3D autocad drawing.
> > > > >
> > > > > I also send a drawing to moki files. You can
> see
> > > the
> > > > > battery box and the new
> > > > > thruster configuration. Between the
> batteries
> > > and
> > > > > the MBT there is room for
> > > > > the air bottle(s).
> > > > >
> > > > > Greatings,
> > > > >
> > > > > Thijs Struijs from
> > > > > The Netherlands
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Warren Greenway"
> > > <opensourcesub@yahoo.com>
> > > > > To: <personal_submersibles@psubs.org>
> > > > > Sent: Wednesday, October 22, 2003 5:42 PM
> > > > > Subject: Re: [PSUBS-MAILIST] DElta sub (was:
> > > > > kitredge sub)
> > > > >
> > > > >
> > > > > > Hey, Thjis. Have you figured out anything
> on
> > > the
> > > > > > battery arrangement for the OSS hull? I
> was
> > > > > starting
> > > > > > to wonder if it wouldn't be better to
> follow
> > > our
> > > > > > original line of though and place the
> > > batteries in
> > > > > > external "pods". The reason I was thinking
> > > this,
> > > > > was
> > > > > > I was considering a hatch at the bottom of
> the
> > > > > hull,
> > > > > > for submerged entry/exit and ambient
> running,
> > > if
> > > > > > ambient pressure was desired.
> > > > > >
> > > > > > Warren.
> > > > > >
> > > > > > --- Thijs Struijs
> <thijs-struijs@planet.nl>
> > > wrote:
> 
=== message truncated ===


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