Re: [PSUBS-MAILIST] acrylic domes

[atozed@juno.com]

Simon - 

A pair of neoprene o-rings make the seal.
That dome has a ton of pressure before it gets to 30 feet.
The few psi that alloy arm pushes on it is nothing compared to the water
pressure.
The only reason for a latch is to keep the dome from burping when
resurfacing, splashing occupants. An altimeter shows the pressure lost as
carbon dioxide is consumed, oxygen is added to bring the cabin pressure
back.  They open an equalizing valve after surfacing before opening the
dome.
Incidentally, I sat in Aviator, and it's cozy. Definitely not enough room
for a few hundred gallons.
The big downside of domes is the price.

-Peter Korwin

On Mon, 13 Dec 2004 17:35:19 +1300 SIMON WALKDEN <mrsym0r@gmail.com>
writes:
> I've seen a common design for entering a submersible, using an 
> acrylic dome as the hatch.
> 
> Some examples I've seen this on are Deep Flight (
> http://www.deepflight.com/subs/dfa.htm ), the craft by Seamagine (
> http://www.seamagine.com/models.htm ),  etc.
> 
> According to the design guidelines written by Ray Keefer on the
> psubs.org website, there isn't alot of research/testing done on the
> dome design. Is anyone aware of any solid data pertaining to this?
> 
> Also, I'm curious - in the images and various videos I've 
> downloaded from respective websites, there doesn't appear to be much of
a 
> locking mechanism to secure the dome to the submersible and keep a few 
> hundred gallons of water out of the 1atm environment. Does anybody have
any
> information, or know the location of information, on what locking
> mechanisms and seals can be used for this?
> 
> Thanks in advance,
> 
> -Simon
> 
> 
> 
>
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