[PSUBS-MAILIST] minn-kota cabling to hull

[Emile van Essen via Personal_Submersibles]

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
>
>

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