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Old 07-07-2013, 17:31   #16
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Re: Dumb Question

Thanks all for your answers.

Blakie Swart, you have me intreaged, can you describe the process?
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Old 09-07-2013, 04:45   #17
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Re: Dumb Question

I think Blackie Stewart was referring to mounting the transducer inside the hull.

A medium like glycerine is used to couple the transducer to the hull. This only works for certain hull materials, mainly solid (non cored) glass fibre and will only work when the boat is in the water.

It may be an option for you (if you have a suitable hull material) if you launch and find the depth sounder is not working. A transducer that fires through the hull can be installed without hauling the boat.
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Old 10-07-2013, 01:38   #18
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Re: Dumb Question

Hi Mollyjo. It's correct what noelex says - it was directly on the hull on the inside. The transducer came with a base for that specific purpose which was mounted onto the fiberglass, filled with glycerine.
Most yachts have a balsa or foam sandwhich but there are areas (I presume) that are solid.
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Old 10-07-2013, 02:03   #19
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Re: Dumb Question

A lot of boats that are cored, the coring ends at the waterline. Even in boats that extend the coring below the waterline there is usually a solid section near the midline.
This is a thick area of fiberglass and the depth performance does tend to suffer with reduced range and more anomalous readings, but does not require a hole in the hull.

A simple test is to fill a plastic bag with water seal it (no air). Place the bag on the hull and the transducer on top (the transducer is not in the bag just on top). If the depth does not work try another spot. Even solid structures have some air voids.
If the works OK you can mount the transducer permanently in the same spot. There are various ways, but a PVC pipe attached to inside of the hull an filled with oil is the most common.
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Old 10-07-2013, 07:04   #20
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Re: Dumb Question

Or, propylene glycol.
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Old 10-07-2013, 07:15   #21
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Re: Dumb Question

my new garmin transducer will read thru fg if i have it mounted in oil. no thruhull needed.. yummy....no haulout necessary.

i believe this method works with other brands as well.....
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Old 10-07-2013, 07:35   #22
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Re: Dumb Question

I have a backup sounder with the transducer that I mounted to the inside of the hull by burying it in beeswax - aka a wax toilet bowl ring. No pvc pipe, no epoxy, and no oil needed. However, you need to make sure there are no air pockets in the wax. Sometimes it takes a couple of tries to get it set without any air. It looks a little wierd, but it works well and it's been in place for four years without any problems.
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Old 10-07-2013, 07:46   #23
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Re: Dumb Question

Quote:
Originally Posted by MollyJo View Post
Ok, I think I need to replace my depth sounder. Will it work on the hard stand or does the transducer need to be in the water?
Needs to be in the water to work.
If you turn it on without water, it will shorten or even burn out as it needs to be water cooled.

Ask me how I know this.
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Old 12-07-2013, 04:10   #24
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Thanks heaps all for your feedback. Some great ideas there. I'll see if I can find in internal type and glass up the hole
Cheers
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Old 12-07-2013, 04:16   #25
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Re: Dumb Question

All the transducers will work internally ( if the boat construction is suitable). Some transducers are a little easier to mount than than others, but all will work.

The traditional external transducer is probably one of the easiest to mount internally.
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