[PSUBS-MAILIST] grounding question

[vbra676539 at aol.com]

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

 

 

 

 


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

 

 

 

 


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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