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

["Greg Teiber" <wolfe19@megsinet.net>]

these camera's are cheap enough to have full coverage of the sub.  $150 a pop if you include the casing. :)  you wouldn't need to risk having ports if you have enough of them.

*********** REPLY SEPARATOR  ***********

On 8/7/00 at 10:36 PM Karl Fuller wrote:

>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
>>
>>