[PSUBS-MAILIST] grounding question

[hank pronk]

Scott,
You could drill and thread the hull and the battery pod to 3/4 pipe thread .  Then screw in a couple of #12 jic hyd fittings and then run a hyd hose with the ground cable inside.  No welding needed, you won't even mess up your paint.
Hank



On , hank pronk <hanker_20032000 at yahoo.ca> wrote:
  
Scott,
When I took the rudder through hull shaft out of Gamma, I found corrosion on the ss shaft right where the o-ring seats.  The shaft is also soaking in grease.  Vance and I concluded it was from Gamma being grounded.  If you operate in fresh water it may be better, but I would make the changes to correct that.  Luckily I was able to machine the top of the shaft so it sits lower and the o-ring is on good material again.  You can use a common through hull for your ground.  It sure sucks but,well, it just sucks.
Hank



On Monday, December 9, 2013 9:40:15 AM, "swaters at waters-ks.com" <swaters at waters-ks.com> wrote:
  
I definitely will attaché one then. Makes perfect sense.  
Thanks Vance, 
Scott Waters  

-------- Original Message --------
>Subject: Re: [PSUBS-MAILIST] grounding question
>From: vbra676539 at aol.com
>Date: Mon, December 09, 2013 9:14 am
>To: personal_submersibles at psubs.org
>
>We used magnesium plate as anodes on the primary aluminum bits and pieces--dive planes for instance, plus the entire rear assembly on a Perry (rudder, beavertail, bracketry and prop ring) were aluminum. The time Alec reminds me of was a dead short in a thruster, and in the minutes it took me to sort out and switch off, I lost a substantial portion of shiny magnesium which was decaying away so fast we could actually watch the little bits fall off. 
>
> 
>Scott might want to stick an anode or two on his boat just for grins, although George never fooled with them on the Ks, and maybe with the low voltage, correctly so. Not sure, but I'm wearing them on mine, just in case. 
>
> 
>Vance 
>
>
>
>-----Original Message-----
>From: Smyth, Alec <Alec.Smyth at covisint.com>
>To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>Sent: Mon, Dec 9, 2013 11:03 am
>Subject: Re: [PSUBS-MAILIST] grounding question
>
>
>It can be alarmingly fast. The bit that will corrode is where the electrons are leaving the hull. That probably won’t be through the paint, but surely you have parts made of aluminum or stainless somewhere that are unpainted yet electrically connected to the rest of the boat. I seem to recall Vance telling a story of an electrical mishap leading to his sub dissolving around him in a cloud of bubbles like a giant Alka Seltzer tablet, leading him to surface as fast as he could. Can’t recall the particulars… Vance?  
>  
>  
>From:Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org?] On Behalf Of swaters
>Sent: Monday, December 09, 2013 9:09 AM
>To: Personal Submersibles General Discussion
>Subject: Re: [PSUBS-MAILIST] grounding question 
>
>I might have to rethink that then. I currently have six tru hulls (3 in each pod). One vent/chargeing plug, one 12V and one 36V. There is no place to run a negative with my current set up with the exception of not using tru hulls and just running wires, but there would be no battery pod breach protection. Just curious, I know that electricity promotes corrosion in salt water, but how would the metal corrod under the paint especially when it is in water for a limited amount of time? 
>Thanks, 
>Scott Waters 
>
> 
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> 
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> 
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> 
>Sent from my U.S. Cellular© Smartphone 
>
>"Smyth, Alec" <Alec.Smyth at covisint.com> wrote: 
>Hi Scott, 
>  
>If I understand you correctly, it sounds like you might have wired her as you would a car, with cables for the positive and using the chassis for the negative. This is a steel boat, so instead of that, what one does is two cables, one for positive and one for negative, but both of them equally isolated from the hull. Else, you are inviting a case of accelerated corrosion.  
>  
>Best, 
>
>Alec  
>  
>From:Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of swaters
>Sent: Monday, December 09, 2013 12:57 AM
>To: Personal Submersibles General Discussion
>Subject: Re: [PSUBS-MAILIST] grounding question 
>
>I connected mine to the electrical pannel through the body of the sub 
>Thanks, 
>Scott Waters 
>
> 
>
> 
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> 
>Sent from my U.S. Cellular© Smartphone 
>
>brian <brian at ojaivalleybeefarm.com> wrote:
>Hi All,
>              On the K boats where does one normally connect the ground to the sub?  
>
>Brian 
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