Phil,
Exterior emergency access is one reason this seems to
be advisable. Also:
1. The boat is in the water unoccupied and you want
to keep waves and wake from splashing in.
2. Towing it on a trailer down the highway in a rain
storm.
3. Keep insects from entering and setting up
housekeeping while not in use.
Would there be a need to have an over-pressure release
operable from the exterior also? Do you prefer a pressure release
that is manual or automatic or is it dual mode?
I've gone through a couple of different designs in my
mind, but really wanted to see yours when I'm in the San Antonio area.
Thanks for mentioning the Deepworker 2000. That's one more reason to
make an educational pilgrimage to Vancouver.
Jim
In a message dated 1/2/2011 8:33:58 A.M. Central Standard Time,
cliffordredus@sbcglobal.net writes:
Alan
These adjustable draw latches have worked fine on the R300.
They develop enough force to compress the hatch O-ring. The
hatch seal works fine. The seal does not leak. They do
not have an outside release mechanism other than removing the
viewport retaining ring that is held by a series of allen head
bolts.
On my next boat, I will go with the hatch mechanism similiar to that
used on Deepworker 2000.
Cliff
From: Alan James
<alanjames@xtra.co.nz>
To:
personal_submersibles@psubs.org
Sent: Sun, January 2, 2011 12:50:20
AM
Subject:
[PSUBS-MAILIST] Cliff's Hatch Closure Mechanism.
Cliff, if you're about.
I noticed your hatch closure mechanism seems
to be a simple adjustable toggle latch.
I bought a few of these a while back thinking
I may use them.
How have they turned out? Do they exert
enough force? Are you getting any water in?
Also do you have any way of opening these
from the outside in an emergency,
or is
the "Big Hammer" the emergency opening device?
Regards Alan