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Old 09-28-2004, 03:59 PM
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Default transducer tank?

Whats a transducer tank and what advantages does it have over standard mountings?
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Old 09-28-2004, 05:12 PM
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Default RE: transducer tank?

Depends on what you mean by standard. Generally there are three common way to mount a transducer; transom mounted on a bracket, thru-hull where the transducer resides outside of the hull and a stem passes throug a hole in the hull, and in-hull mounting.

There are two variations on thru hull, with one being outside the hull on a fairing block, or not, and the other being essentially the same but the transducer is mounted inside a pocket that is glassed into the hull. Either way you get about the same performance out of the transducer. There are also two ways to do an in-hull mount and its one of them that you seem to be interested in. The first way, and what a lot of guys would call the standard, is to simply epoxy the transducer's face to the inside of the hull - sort of glue it down - and let it go at that. This is simple and it works but sometimes bubbles form in the adhesive or under the face of the transducer. If that happens the performance of the fish finder will suffer. A second version of in-hull mounting has you somehow build a tank into the bottom of the boat and then fill that tank with liquid and then suspend the transducer in it. The liquid can be one of many things but mineral oil is a good choice. There are also some factory kits for this type of mounting, and these often involve some sort of "tank" that is cut to match the hull bottom and then attached to the hull bottom with a sealer/adhesive. The advantage they provide is that they provide intimate contact between everything from the water to the face of the transducer. They work very well - I can attest to that. The yellow thing in the picture is a tank from an Airmar M260 transducer, the black thing is the transducer itself. In the foreground is a standard thru hull for applications up to 600 watts..

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Old 09-28-2004, 05:48 PM
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Default RE: transducer tank?

Good explanation and pictures!
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Old 09-29-2004, 07:34 AM
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Default RE: transducer tank?

Thanks a bunch Thom, clarified my situation. Refurbishing a Carver 25 sportfish with a factory "tank", but wasn't sure what kind of liquid it contained. The transducer was suspended in the fluid as you suggested. Boat also has a raised rectangular shaped protrusion up into the bilge area that appears to be created to allow a thru-hull mount without allowing the transducer to protrude below the hull line, but come in contact with undisturbed water. When viewed from beneath the boat, its a rather peculiar depression that was obviously done during the manufacture of the hull. I wonder about the hydrodynamics of that recessed area for a transducer, will it trap air during launching and hold it there while underway? I have a roller trailer that could possibly allow contact with a transducer if I mount it low enough in that recessed area to contact undisturbed water. If I mount it high enough to eliminate possible contact, I question the 'ducers's ability to maintain contact with undisturbed water.
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Old 09-29-2004, 12:59 PM
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Default RE: transducer tank?

If you have the tank use it, and fill in the other hole, if I understand you right. No Bubbles, leaks or problems with the trailer.
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Old 09-29-2004, 01:05 PM
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Default RE: transducer tank?

Airmar has a new transducer designed for thru hull applications for trailer boats. Check it out.
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Old 09-29-2004, 02:40 PM
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Default RE: transducer tank?

Younger,

Do you have a model number on that new transducer? I went to the Airmar site and couldn't find anything about it, but that's not too suprising because the still show the M256 as a NEW product. To be fair they did indicate that they had a new catalog comming out in the spring so the may be letting the maintainence on the web site go pending its release.

Anyway I couldn't find anything on a new in-hull. Tell us what you know about it.

Thom
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Old 09-29-2004, 02:49 PM
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Default RE: transducer tank?

I will have to look. Saw an article recently.
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Old 10-02-2004, 07:18 PM
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Default RE: transducer tank?

I'm sure he's talking about this. Airmar has said this is "Comming Soon" for over a year.

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