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Old 23-07-2012, 20:29   #76
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Re: The Blonde Zinc Replacement

Several companies make shaft contact brushes as previously described. I think they use a carbon contact like those used in electric motors.
2436 - Shaft Brush

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Old 23-07-2012, 20:39   #77
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Re: The Blonde Zinc Replacement

I put in a marelon seacock and a plastic strainer to avoid having molecules of bronze going through my alloy engine.
The shaft and wheel being of course isolated.
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Old 23-07-2012, 21:33   #78
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Re: The Blonde Zinc Replacement

this wont help MUCH with regards to protecting your prop and drive shaft...

it will help... but the issue is ground POTENTIAL.... it will perform it's function and protect / sacrifice itself instead of ship metal that is exposed but it will do so with considderation of proximity to itself and the ship's metal ... the closer the ship's metal the more it will be protected.. the further away the less it will be protected..

the goal should be to place the anode on the shaft as it is the biggest/hardest/most expensive item that could be affected and possibly need replacement...
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Old 23-07-2012, 22:34   #79
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Re: The Blonde Zinc Replacement

Correct me if i am wrong,but dont a cathode and anode have to see each other through an electrolytic medium to be able to swap charges/particles???
Does this mean you have your basket immersed over the side in view of the prop?
Sorry,,i had to ask..
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Old 24-07-2012, 05:15   #80
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Re: The Blonde Zinc Replacement

Quote:
Originally Posted by HopCar View Post
Several companies make shaft contact brushes as previously described. I think they use a carbon contact like those used in electric motors.
2436 - Shaft Brush

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Bluestocking does not have room for a donut zinc on the shaft, and has a Drivesaver between the coupling faces. I therefore use a shaft brush as you have shown, but upgraded the carbon part to a much bigger one from forklift motor.
The bronze tension bar anchors to 1/2" bronze studs thru the hull, to which my zinc plates are attached. All tied into my #8 bonding.
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Old 25-07-2012, 17:07   #81
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Re: The Blonde Zinc Replacement

Well rather then hang the zinc over the side, which works too, there is the 2" seacock and standpipe to bring water to the basket strainer and zinc. So the zinc is physically about 24" to the side and 12" up from the prop.... in some of the same water as the prop sits in, so the circuit is complete.

Hopcar: thanks for the brush link... Another bit to get...

My intent is do do much like bluestocking but with the zinc in my over sized sea strainer. Makes for easy inspection and replacement.... maybe.

Like bluestocking, I have just 1/4" of my shaft is exposed outside the boat in front of the prop.
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Old 25-07-2012, 17:24   #82
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Re: The Blonde Zinc Replacement

In theory a zinc attached to a wire, attached to the metal you want to protect and dropped over the side works. So maybe the zinc in the strainer will! Intuition tells me no for some reason.... OTOH if you notice when you remove a zinc from a prop shaft, the shaft is covered with white power... so how good a bond is that zinc getting...??????
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Old 25-07-2012, 22:27   #83
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Re: The Blonde Zinc Replacement

well being blonde I tend to go off in a tangent sometimes.. OK alot of times.

Why I have a 120V fridge running on an inverter, which everyone said would not work. 5 years later and its still running and using no more power then a 12V system. Cost less then $200

Why I have a led anchor light in a plastic mrs dash seasoning jar, zip tied to the aft stay. Its Bright too.. Total outlay of about $20


I expect I'll have some current path issues with the zinc in the strainer. But I'm going to play with it a bit and see if its possible long term. Sure would be easy..

One of the reports I read (think I posted it in this thread too) indicated that corrosion between the zinc and shaft is a problem and the better way was to bond a wire to the shaft and zinc, which no one does..
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Old 25-07-2012, 23:55   #84
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Re: The Blonde Zinc Replacement

I luv it when schemes work out...carry on the fine work girl!!!!
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Old 26-07-2012, 05:35   #85
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Re: The Blonde Zinc Replacement

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Originally Posted by sailorchic34 View Post
well being blonde I tend to go off in a tangent sometimes.. OK alot of times.

Why I have a 120V fridge running on an inverter, which everyone said would not work. 5 years later and its still running and using no more power then a 12V system. Cost less then $200

Why I have a led anchor light in a plastic mrs dash seasoning jar, zip tied to the aft stay. Its Bright too.. Total outlay of about $20


I expect I'll have some current path issues with the zinc in the strainer. But I'm going to play with it a bit and see if its possible long term. Sure would be easy..

One of the reports I read (think I posted it in this thread too) indicated that corrosion between the zinc and shaft is a problem and the better way was to bond a wire to the shaft and zinc, which no one does..
So if I decided to steal your anchor light idea would I have to use a Mrs Dash jar or could I substitute with a jar from a different spice?
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Old 26-07-2012, 10:25   #86
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Re: The Blonde Zinc Replacement

HAHAHAHA I think the led spice jar might need to be in another thread. But, alot of spice jars are not clear some are redish, some brownish and some a milkish color.

Mrs Dash is clear and so far holds up to the UV. But its early. I just replaced my old glass spice jar as the old led anchor light had some burned out leds and the metal lid was starting to rust.

BTW I used a led bulb from superbrightleds.com.

18 High Power SMD LED 1156/1157 Tower Bulb Specifications

Its Very bright and uses 0.1 amps an hour. 10-30V rated too. I just soldered wires direct to the contacts and taped the bulb to the wire for support..
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Old 26-07-2012, 11:11   #87
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Re: The Blonde Zinc Replacement

I love handy women!
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Old 26-07-2012, 11:24   #88
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Re: The Blonde Zinc Replacement

[QUOTE=sailorchic34;998759

Why I have a led anchor light in a plastic mrs dash seasoning jar, zip tied to the aft stay. Its Bright too.. Total outlay of about $20


.[/QUOTE]

Hey, a salt shaker works much better, like a fresnel lens. This one had a GM sidelight bulb, before the days of led bulbs.
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Old 26-07-2012, 11:28   #89
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Re: The Blonde Zinc Replacement

Did I miss something but arent you now sucking any depleted bits of zinc through your engine now? Or is the anode on the outside of the raw water strainer screen?
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Old 26-07-2012, 11:59   #90
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Re: The Blonde Zinc Replacement

Was woundering who would catch that. The zinc is on the sea side of the strainer, I did check btw. So anything large enough to damage the raw water impeller will be trapped in the strainer. The normal bits leaving the zinc from galvanic action will be quite small, less then a micron, probably atom by atom really , so not a problem
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