You have been busy Frank. I like your secondary backup seal idea using a ball valve for your drop weight release, as well as for electrical through hulls. Generally I would expect leaks in those types of through hulls to be miner, and not life threatening. I am a big fan of back-ups, and for some things I'm thinking of having external valves as well. I very much like that you have a back up to release the drop weight.
Regards,
Brent Hartwig
From: ShellyDalg@aol.com
Date: Tue, 29 Jan 2008 14:07:47 -0500
Subject: Re: [PSUBS-MAILIST] Drop weight back-up mechanism.
To: personal_submersibles@psubs.org
Hi Brent. Although I don't like the idea of a shaft penetrating the hull,
one is unavoidable. This would be the emergency drop weight. It's located in the
center of the hull, and on the lowest point. Here's a sketch of the mechanism
I'll be using. I haven't shown the hydraulic linkage that will be the first
option. This is the back-up method to drop the weight. If the hydraulic
system is jammed/broken, I can open the ball valve, insert a socket, and rotate
the shaft manually to release the drop weight. Of course, this is ''worst case
scenario''. Frank D.
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