[PSUBS-MAILIST] minn-kota cabling to hull

Mon Apr 20 16:14:42 EDT 2015

Alan, I have been making some progress on the Minnn-Kota 101 thruster project. The modified thrusters (added Kort Nozzle, Subconn  electrical penetrator and pressure compensation port.  To see photos go to  http://www.psubs.org/,  then hit projects and photos section, on the projects page under find at the top of this page, change from submersible to research and hit search.  The photos are listed under MK-101 thruster.
The thrusters are ready to go on the boat but I am in the process of repainting the exterior and interior due to hull mods and then I have to put everything back together.  I hope to be back in the water this summer.  Still need to do some performance testing of the thrusters.
Cliff

      From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, April 17, 2015 3:29 AM
 Subject: Re: [PSUBS-MAILIST] minn-kota cabling to hull

Jon,with the concern of the sheath being penetrated & water running down the wiring,I wonder if squirting a low viscosity glue like some of the locktite products, down thewiring from the point where you connect the wiring to the threaded rod, would help.Would need to be a flexible glue to deal with the flex of the wiring.There is a good section on hull penetrations in the Busby book in case you have overlooked that.
On my ambient the motors are air compensated & I have the ambient air pressure from regulators& my wiring running down the same plastic hose. The wiring is potted inside a stainless tube with a flange on it. On one end of the tube is a barb connection to which the hose is connected. Thetube fits in to the blue globe cable gland & the tubes flange stops the tube from being forced throughthe cable gland under pressure. It is easy to just loosen the Blue Globe & pull the wiring out when needed.The blue globe part of the "blue globe" cable gland is unique & designed for pressure so beware of imitations. Emile tested one to 3000psi.Cliff was going through this exercise with his Minnkotas. I wonder how he has progressed???Alan

   From: Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, April 17, 2015 10:23 AM
 Subject: Re: [PSUBS-MAILIST] minn-kota cabling to hull

 Alan,

 The best approach is to use threaded rod with the potting, if possible.  My question is probably better stated in the context of whether air trapped between a multi-wire cable and the surrounding sheath is an issue to be concerned about.  Some cables have a good tight sheath but others such as CAT-5 is pretty sloppy.

 A potential concern of the blue globe gland since it seals around the cable sheath is what happens if the sheath gets damaged and cut underwater.  Water pressure will allow creep to flow between the wires and sheath bypassing the gland.  However the same would be true of a home-made potted penetrator as well.  What type of inflow should we expect from such a breach?  Minor?

 Jon

 On 4/16/2015 4:46 PM, Alan James via Personal_Submersibles wrote:

 Jon, I noted that the lights on "I think" a dual DW at Nuytco had oil in the wiring tubes to the lights, which were a clear plastic. I compensated a linear actuator & didn't strip the wires inside the potting. I filled it with WD40, & it just ran out between the epoxy & the wires when I tipped it upside down. No pressure applied.  I think it was Hank that suggested untwisting the wires so the potting mix  can get around them. On the through hulls, Carsten & Emile are using blue globe cable glands with one outside the hull & another inside for double security. Alan 
      From: Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, April 17, 2015 12:06 AM
 Subject: [PSUBS-MAILIST] minn-kota cabling to hull

 I think Emile had details of potting the minn-kota.  Anyone know where 
 this might be located?

 Anyone waterproofing their cabling by oil-compensation through a poly 
 tube?  If I remember correctly, Aquarius uses this method for the 
 electrical wires to the lights and vacuum.

 Jon

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