Re: [PSUBS-MAILIST] An Idea for a PSUB Periscope

["Karl Fuller" <fullerk@voyager.co.nz>]

Yes it would be in my case Steve, and as high as possible or able to be
extended like a proper periscope. Of course, there are other locations an
outside camera would be useful to have too. Like an astern view to see what
is caught in the prop or what is following you !
Karl
----- Original Message -----
From: Steve Shawl <steve@yel-o-sub.com>
To: <personal_submersibles@psubs.org>
Sent: Monday, August 07, 2000 11:12 PM
Subject: Re: [PSUBS-MAILIST] An Idea for a PSUB Periscope


> On Mon, 07 Aug 2000 22:01:49 -0500, personal_submersibles@psubs.org wrote:
> >i was thinking of having the pump in the camera housing.  so all it has
to do is pull water up a max of a 6' head.  and that water would
> be compensated by the water traveling down the other side.  so the actuall
head pressure would be in the inches not fe
> >And you completely missed what I ment about the cooling tube. First thing
is that doubble pane lenses would be needed because
> the inside of the tube would be most likely lower than than the
surrounding air.  1/8" copper tubing (which would be perfect for
> >the cooling tubes would keep the camera chamber at a steady (cold) temp.
Though as before that would make the window on the
> camera pod want to fog, Therefore he thermal window pane.
> >
> >I'm open to any other criticisms of my idea :)
> >
> >
> >*********** REPLY SEPARATOR  ***********
> >
> >On 8/7/00 at 9:21 PM Gary R. Boucher wrote:
> >
> >>It's not that easy.  Lets say you get a pump.  It has to be a low
> >>voltage pump unless you plan to use a converter.  Pumps designed to work
on
> >>the surface will not necessarily work 20 feet below the surface.  You
may
> >>have to pressure compensate the pump.  You could put the pump inside the
> >>hull but then you have to have some way to get the water through the
hull
> >>interface.  Of course the pump will have to be able to handle the
pressure
> >>at depth.
> >>     The double pane idea seems reasonable at first but the problem you
> >>have is two-fold.  Not only are you trying to make the outside
temperature
> >>of the tube as low as possible you WANT the heat generated inside the
> >>camera to pass through the tube and on our, otherwise the temperature
> >>inside will increase till there is damage.  You want conduction through
the
> >>tube, as much as possible.  You just want the tube to be a good radiator
of
> >>the heat absorbed and generated.  What would help would to be to place a
> >>shield on top of the tube where air can circulate under the shield.
This
> >>would place the tube in the shade in essence lowering the temperature
that
> >>would exist if exposed to sunlight.
> >>     BTW whatever method you use has to be able to stand the pressure.
> >>     I took some photos with my digital camera of what I have, but am
> >>having some trouble uploading them into the computer.  I will get them
> >>uploaded one way or the other.  When I do, I will send photos of my
design
> >>out to anyone interested if they will send me an email.
> >>
> >>
>
>
> Is the camera in a seperate case outside of the sub?
> Steve Shawl - steve@yel-o-sub.com
>
>