Re: [PSUBS-MAILIST] Caught in weeds...

[Ian Roxborough <irox@ix.netcom.com>]

Hi Pierre,

I was thinking that a hopper full of steel ballbearings with an
electro-magnet at the mouth.  That way you could control the
weight release speed by turning off and on the electro-magnet.
In event of a powerfailure, the electro magnet keeping the
ballbearings in the hopper will shut off letting the ballbearing
out at a rate determined by the size of the hopper mouth.  So
without power the sub would return to the surface at a safe speed.

Ian.

On Sat, 30 Jul 2005 12:05:32 -0400
Marie-Andrée et Pierre <poulin.carrier@videotron.ca> wrote:

> Nope...
> 
> I was not sure about the safety of the drop weight since Big is an ambient 
> sub. The battery pod is filled with lead. it weight about 600 pounds. I made 
> the pod so it can be dropped. I only need to install the control inside the 
> sub if I ever change my mind.
> 
> I am not sure it is a good idea to drop 600 pounds out of a total of 1300 at 
> let's say 60 feet and go rocket to the surface. For one, the hull may not 
> survive the pressure. I may not survive the change in decompression. If the 
> hull craked, the sub will be more heavy with water and go down again if I 
> don't exit fast enough.
> 
> So what I did is make an escape from the sub easy. I have a pony tank with 
> me inside the sub that can easyly be carried on my controled way to the 
> surface.
> 
> Anybody have any though about that?
> 
> Pierre
> 
> 
> 
> 
> ----- Original Message ----- 
> From: "SeaDiver" <seadiver@gmail.com>
> To: <personal_submersibles@psubs.org>
> Sent: Saturday, July 30, 2005 11:41 AM
> Subject: Re: [PSUBS-MAILIST] Caught in weeds...
> 
> 
> > Pierre does big have a drop weight?
> >
> > Curtis,
> >
> >
> >
> >
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> 
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