[PSUBS-MAILIST] magnetic coupler

[Vance Bradley]

Vent from mbt--you do it anyway to slow ascent, then do it some more to hover at fifty feet so the surface support boat can find you. 
Vance

Sent from my iPhone

> On Mar 21, 2014, at 1:21 AM, "Brian Cox" <brian at ojaivalleybeefarm.com> wrote:
> 
> Is there a preferred method of releasing a big bubble?
> 
> --- VBra676539 at AOL.com wrote:
> 
> From: Vance Bradley <VBra676539 at AOL.com>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] magnetic coupler
> Date: Thu, 20 Mar 2014 21:03:12 -0400
> 
> The air bubble to the surface is a time honored practice for sub ops. Much cheaper than all the electronic tracking gear on Alvin.
> Vance
> 
> Sent from my iPhone
> 
> On Mar 20, 2014, at 7:57 PM, Alan James <alanlindsayjames at yahoo.com> wrote:
> 
> Thanks Hank,
> I was thinking it would come together fast. Might be a sod to get apart again.
> Maybe you could use a smaller magnetic coupler for other functions on a submarine.
> For instance it could be the axle in a drum of cord that the emergency buoy or an ascent
> warning buoy could be released with. The power of the magnet would stop the drum from
> rotating & releasing line, but if you pulled the magnet out of the housing slightly you could
> control the release speed of the buoy & avoid a birds nest in the line. If you had a drive on it
> it could be set to slip against the buoancy of he buoy but reel in line if there was slack.
> I've thought that sending up a buoy before ascending would be a good way of warning your tender
> or any other pleasure craft. The tourist subs in Hawaii send up a huge bubble of air. The tender spots
> this & radios an acknowledgement that they are clear before the ascent.
> Alan
> 
> 
> From: hank pronk <hanker_20032000 at yahoo.ca>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Friday, March 21, 2014 10:07 AM
> Subject: Re: [PSUBS-MAILIST] magnetic coupler
> 
> Alan,
> The oil filter looking part is the barrier that keeps the water out of the sub.  There is a magnet inside the barrier that is connected to the propeller shaft.  When you assemble this thing you need to be real carful.  The first time I slid the magnet assemblies together I almost lost a finger.  If the propeller gets jammed, the magnet drive would slip like a clutch. It would take a lot though, my magnet drive is bigger than it needs to be.  The propeller assembly  can still drop off in an emergency, that is all the same still.  I am pretty happy with the whole conversion, it can not leak!
> Hank
> 
> 
> On Thursday, March 20, 2014 1:04:29 PM, Alan James <alanlindsayjames at yahoo.com> wrote:
> Hi Hank,
> The part that looks like an oil filter is the covering over a rotating magnet?
> The second part is the full assembly that fits over the magnet (oil filter) portion.
> What sort of force is involved when you put together or pull the two magnetic portions apart?
> If you jammed the propellor on something the internal magnet would still rotate
> but can it pull apart separating the propellor & it's obstruction from the coupler?
> I've added a link to the coupler.
> http://www.psubs.org/projects/1327775450/gammarestoration/
> Alan
> 
> From: hank pronk <hanker_20032000 at yahoo.ca>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Thursday, March 20, 2014 10:26 AM
> Subject: [PSUBS-MAILIST] magnetic coupler
> 
> Anyone that may be interested, I posted a couple of pictures of my magnetic drive coupler assembly.  It is kinda chunky at about 9in long.  I can NOT overpower the coupler by hand, it is incredible how strong it is.  I pressure tested the assembly to 625 psi for one hr with no issues.  I will oil fill the shaft tube to lubricate the outboard shaft bearing and protect against corrosion.  This was a simple two day conversion with minimal machining required.
> Hank
> 
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