[PSUBS-MAILIST] minn-kota cabling to hull

[James Frankland via Personal_Submersibles]

Hi jon,
II found some pics.  First one is of how I potted the join from the sub con
bulkhead connector.  This is for the lights but the motor is the same.  The
wires are soldered and insulated.  Then the rubber pipe slid over the top
and the whole thing filled with epoxy.  I said it was basic.

Also a pic of a possible rotating through hull seal.  I didn't use this in
the end as I couldn't get the cable onto the copper pins.  If I had made
flat connectors so I could push them on, it would have worked,  I just got
fed up and potted it, but I think this idea maybe has merit.  Not sure if
the oil inside the through hull would affect the blue globe.  Would need
testing.


​
​

On 22 April 2015 at 19:02, Emile van Essen via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Jon,
>
> Can be about the same construction. The cable sheat is indeed a issue. I
> sealed that with RTV. Not on drawing. Can be also done with a low pressure
> cable gland.
> 15 Bar for the Blueglobe is conservative or a high safety factor. They fail
> single at 80 Bar and back to back  (in penplate) at 140 Bar. Failure mode
> is
> sliding inwards so even no leak then,
>
> Emile
>
>
>
> -----Oorspronkelijk bericht-----
> Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org
> ]
> Namens Jon Wallace via Personal_Submersibles
> Verzonden: woensdag 22 april 2015 18:49
> Aan: Personal Submersibles General Discussion
> Onderwerp: Re: [PSUBS-MAILIST] minn-kota cabling to hull
>
> Emile,
>
> I like the idea of pressing brass rods into the delrin to avoid epoxy
> but in my case I am not using motors with a thrust tube. I've got fixed
> motors using a  thru-hull (see attachment) that requires a
> penetrator-type cable.  I'd have to either have a head on the delrin on
> the high pressure side or perhaps threaded on both ends to "bolt" it in
> position.  But the bigger issue would still be sealing the cable sheath
> which would either require epoxy or the blueglobe gland.  The blueglobe
> doesn't sound like it stops creeping of the cable due to external
> pressure though and would require taking Alan's approach of epoxying the
> cable in a tube with a head, then passing that tube through the
> blueglobe to prevent pressure creep of the cable into the cabin.
>
> It would be nice to get away from epoxy completely but I'm not sure it's
> possible in my kind of configuration.  By the way, blueglobe
> documentation states a maximum pressure of 15 bar.  Do you believe this
> is conservative based upon your own testing?
>
> Jon
>
>
> On 4/22/2015 2:06 AM, Emile van Essen via Personal_Submersibles wrote:
> > Jon,
> >
> > (resend massage)
> >
> > Potting is okay but I switched to a pressure proof Delrin/ POM isolator.
> > Brass contacts are pressed in a Delrin bushing. On the outside sealed
> with
> a
> > 0-ring in the thrusters tube. See attachment Main advantage is that it is
> > dismountable.
> > BTW. I used the Rhino as they have a all metal construction
> >
> >
> > Regards, Emile
> >
> >
>
>
> _______________________________________________
> 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/20150423/b771e36b/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image26017.jpg
Type: image/jpeg
Size: 40996 bytes
Desc: not available
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20150423/b771e36b/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image25317.jpg
Type: image/jpeg
Size: 25795 bytes
Desc: not available
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20150423/b771e36b/attachment-0003.jpg>