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[PSUBS-MAILIST] dome or cams ? was tank periscope optics
Hi Dan ..
The acrylic windows are only cheap for small diameters and tickness-
that required that your eyes must be very close to the window..
I ask for two windows of 700 mm diameter and 110 mm strong,
flat conical port design from a serious British manufacturer.
(Good for 250 meter work deep)
The price for one window in 2000 was :
1250 Pound sterling for the window
1100 Pound sterling for material testing
350 Pound sterling for Certification
----
2700 Pound plus 16 % tax = 3132 Pound
for two windows = 6264 pound (about 18000 euro)
one stainless steel ring so strong that it can hold
the window and do not dammage the pressure hull integrity
is about 2000 Euro/USD, so at 4000 euro for two.
all together is about 22,000 USD or 22.000 euro plus labor
cost for the profi- welder .
The visibel axis in my sub with this ports is about
20 degree to both sides. No real view to forward.
And the windows are locate about two meters
away from the bow-nose.
For some reasons I decided to have no windows
- but some 15 and 19" TFT screens.
Maybe two of 19 and two of 15 inch size.
Will be all together 2000-3000 euro. Maybe less in some month/years.
A simple good cam is about 30 USD. The casing selfmade
from stainless and acyrlic maybe about 170 USD.
I will have at least one in the bow, one in the mast (turn 270 degree),
one below the diver exit, one in the diver chamber and one
with stern view to the propeller - so about 5 units.
So all together will be about : 3000 to 4000 euro/USD
I can conect the units to a videotaperecorder and the
cam-units work near zero lux (more or less in darkness).
Four or fife people can watch the screens together.. Some
electronics filter can maybe apply - black and white mode
for higher resolution with a additional bow camera maybe.
For the price difference : 22000 - 4000 = 18000 USD
I can purchase 18000 / 10 : 1800 bottles of fine scotch
wiskey. If I drink one bottle a week = 1800 weeks
or 1800/52 weeks a year = 35 years long. I am 37 years old
so that should work :
"Free drinking for the rest of my life - without domes"
A dome is a fine thing - if your head is in .. like
in a small sub like Kittredge or Sgt.Peppers - or
if you have 26 of them like in a tourist sub..
But for bigger boats ? Imagine a real big panorama
screen like in NCC 17-01 D (Jean L.Piccar's ship)
in front of your main bridge seatings..
Acrylic domes can be very easy dammage by even small
scratches - on board of the supply ship or in your workshop.
So it is a good idear to cover them with a second non watertight
dome.. The dome of Sgt.Peppers is 13 years old and has some
smaller scratches outside from handling - so must be replace
before next time go deeper..
Make it K.I.S.S - like a CCD cam.. :-)
see you, Carsten
Dan h schrieb:
...
> I don't
> understand the advantage in using prisms to look around corners with
> when all you need is a piece of acrylic to keep the water out. Even
> using cameras seems like over kill. If the view ports are kept to a
> small diameter there not expensive. Say, keep them to the size of
> plasma TV monitor and forget the electronics!
> One thing about acrylic, as long as you use the proper thickness for
> the depth your diving to, it always works. No matter if you have a
> power failure, an equipment failure or an operator failure. It's
> almost fool proof! Isn't that one of the most important criteria in
> designing anything like a sub. When life and limb could be hanging in
> the balance, simplicity and safety are usually the number issues in a
> good design. Cameras and optics are fine as extras, but a hole in the
> hull filled with an acrylic disk as the main way to see out makes good
> sense to me.
>
> I spent many years designing mechanical systems. Several rules of
> thumb that kept me out of trouble (most of the time) were:
> Be efficient. Do many functions with one part rather than one function
> with many parts.
> Keep it simple.
> Where safety is a consideration, cover all the bases and take no
> chances. Design in redundancies, if allowable.
> And lastly, design in some "wiggle room" to accommodate revisions and
> up dates.
>
> Remember K. I. S. S. !!!!!!
>
> Dan H.