Changing your zinc in the water
, With just a mask, fins, and snorkel, is a piece of cake, (if the water
isn't too cold). I've done it hundreds of times. In the sailing season, I wipe off my hulls with a gloved hand to knock off the slime, every time I go out, and buff off the zinc too.
You need the zinc, a hex key, scotchbrite, and a very small hammer, or something to tap with.
First breath, you go down and scotchbrite the shiny spot on the shaft for good contact. Next breath you go down and put the two haves together over the shaft with the slit vertical, and the screws horizontal, and press FIRMLY. (30 sec max) If it feels stable, it will hang there. Catch your breath... On the third dive, take the hex key and loosely snug the screws. Come up for air... fourth time, snug really snug, but be sure that one side is not closer to touching than the other. One last trip down, and tap both halves together with a hammer, screwdriver handle, whatever. (just a few good taps), Then snug with the hex key one more time.
The triple zinc idea does give a safety
in theory, but not unless it slings one. This should not happen if you put it on right, like I described. Also, I suggest that you always change it when it is about half way gone, LONG before it is likely to fall off. This way the electrical
contact can be counted on.
Multiple zincs do not protect any better, but might last longer... at a price
. It makes the prop less efficient, and if the prop is not painted, the additional current that it creates, will attract barnacles
to the prop more. The dissimilar metals, in salt water
, create a battery
, and the more current, the happier the critters are.
One other thought, especially during warm enough weather
to be diving
on the boat, You should dive over and gently scrape the scale, slime, cement like coating off of the zinc, with the blade of a small putty knife. The contact with water keeps them working, and frequent diving
to look, gives you peace of mind that all is well.
Hope this helps, Mark... (another one)