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Old 06-15-2013, 04:00 PM   #1
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depth sounder

Anyone ever epoxy a transducer to the inside of the hull
did it work?
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Old 06-15-2013, 04:15 PM   #2
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I used beeswax as a temporary mount for a year or so. If you use epoxy make sure there are no air bubbles and that the hull has no core or delamination. I even had mine in a baggie full of water with s rubberband for a while. Do some trials before you epoxy.
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Old 06-15-2013, 04:45 PM   #3
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Some places on the hull are better than others, so experiment with different locations before deciding on the permanent location. That said, it works just fine if you can get the right spot. I echo what Northern Spy said, by the way.

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Old 06-15-2013, 05:29 PM   #4
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depth sounder

Quote:
Originally Posted by davesail View Post
Anyone ever epoxy a transducer to the inside of the hull
did it work?
Yes, I did, years ago, works great. I sanded the hull inside nice and smooth then used grease to shoot thru the hull to make sure there were no delaminations that would prevent proper operation. Then I cleaned the inside really good, built a box to poor the epoxy into with a board across the top to hang the transducer from. I mixed the epoxy very slowly so as to not put air bubbles in it the porred the epoxy into the box. Lastly I hung the transducer down into the epoxy with the board holding it nice and straight pointing down. Oh, be sure to paint wet epoxy all over the transducer so as you lower it into the box no air bibbles form on it's face.
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Old 06-15-2013, 07:10 PM   #5
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I also installed one with my ray marine dept finder. I installed it about 10 years ago and it has worked flawlessly. Following instructions and the prep is key, also use the proper oil to fill the void, I believe it was castrol oil. I have a second redundant system with the traditional thru hull transducer and I see no difference, and at times I think this one is more accurate and never acts up.. This system actually works better when you get bubbles or mud churning up below the hull, the traditional one sometimes zeros out in these conditions..
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Old 06-15-2013, 07:39 PM   #6
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I asked the same questions. I just mounted a transom transducer last weekend.

1. I already had it - came with the sale.
2. I was unsure of the reliability of an in-hull unit and all the machinations to do it correctly
3. The transducer measures water temperature and my family and I like to swim.
4. Wiring cable was time consuming, but either job would be.
5. It works freaking great. I am so happy. I advanced 15 years in technology in just a day. My old depth finder was mid-90s vintage.
6. Garmin 740s is the unit. I got depth graphs, temp graphs, frequency choice, time. location, and depth memory.

I boat in eastern North Carolina where the water is rarely deeper than 20 feet. Knowing the accuracy to the decimal place is very useful to my region.

Not saying in-hull is bad, almost did it, but transom-mount took out some guessing.
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Old 06-15-2013, 07:42 PM   #7
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I did also, works great and you don't cut another hole in the boat. used kids play clay , made a pocket and filled with water , place transducer in the water and read depth if you get a reading then redo with epoxy. good luck
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Old 06-15-2013, 07:44 PM   #8
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Just to clarify, they make specific transducers to install inside the hull which work just as good as the though hull transducers
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Old 06-15-2013, 08:07 PM   #9
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I installed mine a "shoot thru the hull" Humminbird puck in wax. the wax is from a wax ring as used to seal a toilet onto a floor drain, available at any hardware store. I kneaded the wax well to soften it and remove air bubbles, put a blob of it against the hull and squished the puck into it. It worked well so I left it there that was about 4 years ago. it has worked fine since. This is a digital display model.
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Old 06-15-2013, 08:14 PM   #10
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I installed mine a "shoot thru the hull" Humminbird puck in wax.
Love it! That's a keeper for the hints and tricks book. Thanks.
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Old 06-15-2013, 09:51 PM   #11
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use a baggie filled with water, place the ducer on top of it and find a suitable spot to shoot through the hull.

For my thru hull...I got a 3 inch PVC coupling, cut it to the hull angle, 5200ed it to the hull and filled it with water.

Then I drilled a hole for the stem of the ducer in a 3" PVC reducer and mounted it in the reducer, then stuck the assembly into the 3 inch coupling mounted to the hull. Looks as factory as any of the Airmar shoot through the hull cases.

2000 miles and 6 months later it still works flawlessly for about $10 in parts and goo.
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Old 06-15-2013, 10:51 PM   #12
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Garmin assured me I could run the flybridge GPS/Sounder off the lower helm one using a cable, with just one transducer so I bought. You can`t. I fitted the unit supplied transom mount transducer inside the hull, mounted in goop in a piece of pvc pipe cut at an angle so the top edge was level. I used a small level to ensure the transducer itself was level so it shot correctly straight down. It works, takes a few seconds to find bottom,then it`s fine. The IG hull is nearly 1" thick solid f/g.
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Old 06-16-2013, 06:18 AM   #13
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For my thru hull...I got a 3 inch PVC coupling, cut it to the hull angle, 5200ed it to the hull and filled it with water.
That's how I mounted one in my Zodiac. Only have to remember to keep the water supply topped up though. And for the record, if the transducer or mount is off a few degrees it really doesn't matter. Unless you are doing hydrographic survey work the error is negligible and can be offset in any event.

I really like the wax idea, may use wax to replace the water.
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Old 06-16-2013, 06:37 AM   #14
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That's how I mounted one in my Zodiac. Only have to remember to keep the water supply topped up though. And for the record, if the transducer or mount is off a few degrees it really doesn't matter. Unless you are doing hydrographic survey work the error is negligible and can be offset in any event.

I really like the wax idea, may use wax to replace the water.
Wonder if you could melt it and set the ducer in just as it was starting to solidify (to help eliminate bubbles)?
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Old 06-16-2013, 06:56 AM   #15
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While a shoot thru the hull transducer does work , you can tell shallow water depths and find fish to eat , it has a problem.

The depth the unit will read to is reduced a good deal.

If you consider the depth gauge to be part of the navigation instruments loosing much of the depth will reduce your ability to run contour nav or similar.

GPS is great , but may not always be with us.

Belt and suspenders with on board gear might be prudent.
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Old 06-16-2013, 07:21 AM   #16
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Quote from the major manufacturer of transducers:

"All Airmar in-hull transducers are engineered to offset the signal-loss from passing through a fiberglass hull. Our in-hull transducers are far more sensitive than mounting a standard transducer inside your hull. And our in-hull models have built-in deadrise correction to aim the transducer's beam straight down toward the bottom. All Airmar in-hull models will perform as well or better than comparable transducers installed outside the hull. "
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Old 06-16-2013, 07:57 AM   #17
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True, but if you are mounting a thru hull or transom mounted transducer inside you will lose resolution and depth as it will be going through one or more mediums of different density. You will also see that on the top of the screen if you are using a fishfinder. Many of them have a means of filtering out the surface bounce though.

Real world experience was that the Garmin 400 series fishfinder with a 600w transom mount transducer was adequate to ~800 ft depth when mounted in the hull for bottom sensing, but the bottom clarity was low. When it was placed in the water (held on a stick over the side by hand, an experiment) the resolution increased greatly and the depth went to over 1000.

It would make a difference if you were game fishing, I guess.

When I hauled out, I replaced my temporarily mounted toilet ring beeswax transducer with a different thru hull transducer. I wanted a paddle wheel and temperature as well as the better bottom resolution at depth as I use it for setting prawn traps (rocky bottoms). The fish echos are smaller and more accurate as well.

If you just want a number, the wax mount will work just fine.

As Rick pointed out, the transducers made for in hull have a different acoustic window and would work as well as a thru hull.
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Old 06-16-2013, 08:06 AM   #18
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[QUOTE=psneeld;163069]

For my thru hull...I got a 3 inch PVC coupling, cut it to the hull angle, 5200ed it to the hull and filled it with water.

I used the same method and had no problems for 14 years with a Garmin 125 GPS/Sounder. Still going strong with the new owners. I glued a screw clean out to the top the 3" pipe and drilled a hole for the wire. Check the water level every spring. Was I to do it again though, I realy like the wax idea.

Rob
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Old 06-16-2013, 11:53 AM   #19
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I guess a transom mounted transducer is there to confirm that you have just run aground?

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Old 06-16-2013, 12:47 PM   #20
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I have to say that this thread has given me some really useful hints!! Kind of a "Heloise's Hints For Boaters." :-)

John
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