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:Rick 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