[PSUBS-MAILIST] Drop weight design

Sat Sep 17 17:00:01 EDT 2016

Hi Brian,If you are putting this idea to a vote, my vote is no.  For one you are over complicating a uncomplicated feature.  If you want to drop weight in increments then you can make that system mechanical just as easy.  You could argue that with magnets, the sub would surface if you were unconscious.  If that is your reasoning then it may be practical.  I have learned that less is better in a psub and that goes for all the crap we carry around.  Heck I carry enough stuff to run away from home and rebuild a small block chevy.  ;-)Hank 

    On Saturday, September 17, 2016 2:30 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Brian,We discussed this a few years back, & I can remember Vance making some negative comments about the system, saying that on the slightestinterruption to the power the ballast would drop.It may be that because the subs mentioned, are going so deep,there are very few other alternatives.I have a stack of magnets for fire safety doors, that keep doors open& release them to close in event of fire. They don't seem to draw muchin the way of amps, from memory.Of course you would have to epoxy them or something, & they would loosea bit of power with the bigger gap caused by the insulation.You would need a manual system to hold them in while transporting &when the power was off for storage. A big plus would be the instantaneous response in an emergency, butyou could get that other ways.Alan

Sent from my iPad
On 18/09/2016, at 7:59 am, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

I wonder how many watts those electromagnets take?   I could do some tests to see what it would take to hold back the pressure of the shot. Brian

--- personal_submersibles at psubs.org wrote:

From: via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles at psubs.org
Subject: Re: [PSUBS-MAILIST] Drop weight design
Date: Fri, 16 Sep 2016 15:12:10 -0400

Oops, that would be Nautile, the French sub.

s 
-----Original Message-----
From: via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles <personal_submersibles at psubs.org>
Sent: Fri, Sep 16, 2016 3:09 pm
Subject: Re: [PSUBS-MAILIST] Drop weight design

The French didn't have anything to do with Trieste except for escort duty. It was built in Italy (in Trieste, don't you know) and belonged to Auguste Picard, who was Swiss. Then the US Navy. And yes, steel shot was used on all the bathyscaphs, including the French one, which was built later and called Archimede. And a few others, as well (like Nalutile). All of them had some variation of a ring electromagnet at the throat which served as a valve.Vance

-----Original Message-----
From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Fri, Sep 16, 2016 2:46 pm
Subject: Re: [PSUBS-MAILIST] Drop weight design

Actually they used steel shot rather than lead, and the flow was started or stopped via an electromagnet. A benefit of this was that you could easily shed increments of weight, and another was that if you lost power, the sub would drop it's ballast automatically (i.e. fail-safe).
Best,
Alec
On Fri, Sep 16, 2016 at 8:48 AM, Jens Laland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Gentlemen,

If I'm not wrong, I think the French used a whole lot of off-the-shelf
lead balls (as used in shotguns) in two individual pellet ballast
hoppers when they operated the "Trieste" back in the 50's, ref
https://upload.wikimedia.org/wikipedia/commons/3/31/Trieste_nh96807.svg

Best regards,
Jens Laland
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
_______________________________________________Personal_Submersibles mailing listPersonal_Submersibles at psubs.orghttp://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20160917/5b3eabb5/attachment.html>