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Wet Box Fill Media

Old 10-30-2006, 04:51 AM
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Default Wet Box Fill Media

Hi Team!

I have an M260 ducer mounted in a wet box and want the best media to fill the box with...

I have sealed the box onto the fiberglass hull with Marine grade sealant Sika 291.

I want to know the reasons why different media with different viscosities are used in Wet Boxes?

What is it (from a chemical composition point of view) that determines the type of media used in Wet boxes?

Why is it important that ducers designed for wet boxes require certain media to operate properly inside the wet box?

I have been infomred that any petroluem based oil will eat away at the sealant and hence not suitbale - is this correct?

I have also been informed that distille dwater may be better used in this case (with sealant)..Is this correct?


This information will assist with my decision what to use when filling my wet box..

Smelly
Old 10-30-2006, 05:21 AM
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Default Re: Wet Box Fill Media

I read elsewher on this forum the following..

".... I am not an engineer but I believe the material property that is of concern is called Modular Elasticity, or something like that. As it has been explained to me this is the property, if it is high. that allows some materials to ring like a bell when struck or if low makes them go "Thud" like a block of clay. You want stuff that goes 'ring' rather than stuff that goes 'thud'. ..."

What fluid would best suit the "ring" with a box mounted wiht silicone?

Smelly
Old 10-30-2006, 08:13 AM
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tg
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Default Re: Wet Box Fill Media

My instructions said mineral oil or propylene glycol...that was enough for me.
Old 10-30-2006, 10:30 PM
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Default Re: Wet Box Fill Media

Propylene glycol and GE silicone II...this is what Airmar now recommends.

Harry
Old 10-31-2006, 09:21 AM
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Default Re: Wet Box Fill Media

Salt water that's the medium that a ducer is designed to work with
Old 10-31-2006, 03:28 PM
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Default Re: Wet Box Fill Media

ANy more takers..all these differnet opinions..
Old 10-31-2006, 05:06 PM
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Default Re: Wet Box Fill Media

alt water that's the medium that a ducer is designed to work with
While this is true, in a northern climate it could freeze and break thing's.
Old 10-31-2006, 07:56 PM
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Default Re: Wet Box Fill Media

Saltwater is not a good fluid. First off, the organics in the water will rot causing the water to stink...not an issue until you open the box. Second, Saltwater will corrode the stainless lid over time (Airmar uses a cheap grade of stainless). Third, Saltwater freezes as mentioned by others and even without freezing, the thermal expansion is too great and may pop the seal if it gets very hot compared to when it was installed. Finally, in hulls are not designed to run in the water, they are designed to run in the correct medium, which per Airmar is Propylene Glycol antifreeze.

Harry
Old 11-01-2006, 12:41 AM
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Default Re: Wet Box Fill Media

where can i buy Propylene Glycol antifreeze?

Do I go to car shop and ask for radiator antifreeze ?
Old 11-01-2006, 07:01 AM
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Default Re: Wet Box Fill Media

You ask for low toxicity anti-freeze. One brand is Sierra. Advance Autoparts sells it and I'm sure others do as well.

Harry
Old 11-01-2006, 08:36 AM
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Default Re: Wet Box Fill Media

Harry, I agree with everything that you say regarding freezing (if that is a concern?) as well as corrosion of the stainless lid and the fact that the water will "go off" in a sealed box and stink. However there is NO difference between an Airnar ducer built for wet box installation as opposed to a ducer designed to come in contact with the saltwater. They are both built of the same material (Urethane). I know this because I purchased an Airmar M256 (wet box) and when I changed boats I needed the TM256 (transom mount style). When I bought the TM256 it looked very familiar and on checking my M256 I saw it was the exact same ducer, even th same mounting arrangement for attaching the ducer to either the wetbox lid or the TM256 transom bracket leg. For those that have the M260 you'll see that it has the same mounting arrangement and can be used on the leg of a TM256/8 transom mounting bracket.
Old 11-01-2006, 09:19 AM
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Default Re: Wet Box Fill Media

ok...


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