Arghhh - sorry guys. I don't remember ever
mentioning exactly how I was going to mount the regs. Mea
culpa.
Bulkhead mounted, mouthpieces inside the cockpit,
diaphrams outside exposed to the ocean/lake. There's the delta
pressure.
Rick L
----- Original Message -----
Sent: Friday, January 20, 2006 2:33
PM
Subject: Re: [PSUBS-MAILIST] Ambient /
1ATM Q?
Paul, Rick
We are talking about second stage scuba regulators which are triggered
by the negative pressure of inhalation correct?
When this is in your mouth there is a large gradient between your
inhalation trigger and the surrounding pressure and this delivers the on
demand flow.
If the regulators are strictly inside the cabin with you, how do they
know what's happening outside? Unless there is some sort of differential
membrane trigger such as the one Chip described. As Rick had described, I am
assuming this bank of regulators is just sitting there in the cabin with you,
and absent a differential sensor, I don't see a trigger for the flow.
Joe
From: Paul Kreemer
<paulkreemer@gmail.com> Reply-To: personal_submersibles@psubs.org To: personal_submersibles@psubs.org Subject: Re:
[PSUBS-MAILIST] Ambient / 1ATM Q? Date: Fri, 20 Jan
2006 12:45:28 -0800
Joe, when you descend the cabin pressure will decrease
relative to the ambient pressure. So that would be a negative pressure
gradient that could trigger the regulator.
Right?
Paul
On 1/20/06, Joseph Perkel <joeperkel@hotmail.com>
wrote:
"I'd like to add to this by saying that a semi-dry ambient can also
use this system. How? Once the required amount of
ballast water is admitted, you seal off the cockpit so that the regs
take over. Open the valve, the cabin is exposed to surrounding water
and the regs are disabled by default. Close the valve, and the cabin
pressure is now isolated and available to the regs."
I'm sorry Rick, "explain it to me like I'm a two year old" Where the
cabin environment is concerned, where is the negative
pressure required to trigger the regulators on descent?
I can see Chips membrane trigger working but, this I don't get yet.
Joe
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