Boating Tip – #2

Well boaters it’s been a long hot summer and I noticed as I walked down the docks during the week that most to all had their air conditioners running while the boat was unattended.

Letting your air-conditioning run while you’re not aboard the vessel  for five or more days uses unnecessary power, wear and tear on your air-conditioning  and a  bit of a risk having water flowing through your boat why you’re not there.

Oh but wait there is an answer, keeping your humidity level low on the boat while you’re not aboard is very simple, check your owner’s manual on your air-conditioning unit and look for the humidity mode and/or moisture mode depending on your unit  in your boat. You will find with a simple press of the button your air-conditioning will only run when your humidity level increases in your cabin, most set points can be preset by you.

Your air-conditioning will turn on and cool the cabin to the desired temperature , then it will go back in the sleep mode and shut down until the temperature rises again. So instead of your air-conditioning running 24/7 for 5 to 6 days straight, it will only run when your preset temp.  is reached, this will  save  unnecessary use on your equipment , and the risk of water damage while the vessel is unattended.

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Boating Tip – #1

Hello Fellow Boaters…

This boating tip I thought I would talk about Sacrificial Anodes. Which are used to protect various metal components that make up the modern drive system. Below is a brief description of what function an anode performs.

An anode is attached to a metal object, such as a boat or underground tank, to inhibit the object’s corrosion. The anode is electrolytically decomposed while the object remains free of damage. Sacrificial protection is basically attaching a piece of metal that is more reactive that iron to the object made of iron. This more reactive metal, commonly magnesium or zinc, will corrode in the place of iron. That is, the more reactive metal will feed the iron with electrons each time the iron is oxidized to form iron ions, thus reverting it to iron once again instead of letting it become iron hydroxide (rust). Thus, the more reactive metal is sacrificed for the iron.

Problems:
-What are the purposes of using sacrificial anodes?
-How do sacrificial anodes function?
-What other forms of cathode protection?
-What different metals can be used as sacrificial anodes?

Answers:
-Sacrificial anodes are used to protect metal structures from corroding.
-Sacrificial anodes work by oxidizing quicker than the metal it is protecting, being consumed completely before the other metal reacts with the electrolytes.
-Several different forms of cathode protection are forming alloys, plating, and galvanizing the metal.
-Three metals that can be used as sacrificial anodes are: Zinc, Aluminum, and Magnesium.

Zinc: Preferably for saltwater however will offer some protection in freshwater.

Aluminum: For salt and brackish water.

Magnesium: For freshwater use only. Best option to protect drive systems in freshwater. But should not be used in salt water. (Most manufacturers install from the factory Zinc anodes since they will work to varying degrees in fresh or salt water. Since there is no way to know where the boat will be used.)

It is important to match the correct anode material to the area you will be boating in. In a freshwater application Magnesium is the best material to choose to install for out drive, shaft and rudder anodes. However it CAN NOT be used in salt or brackish water.

While there is vast amounts of data on the subject basically watching the condition of the anodes on you’re out drive or lower unit is a pretty easy task. They need to be tight and no more than ¼ – 3/8 eroded and clean of any bottom paint. If your boat is equipped with a Mercruiser Bravo 3 drive then it’s a good idea to make sure it is equipped with a additional prop shaft anode that provides extra corrosion protection. Mercruiser has a kit to enable a prop shaft anode to be installed if your out drive was not originally equipped with one.

Note: Make sure that the bottom paint is not touching the out drive transom plate or the aluminum hydraulic swim platform lift while leaving a 2″ gap is a normal practice in the marine industry.

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