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Old 23-08-2011, 00:00   #1
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Replacing Speed / Depth Transducer

Hi,

I have an through hull Airmar speed/depth transducer connected to Furuno instruments. The speed function of the transducer is provided by a paddle which I am for ever having to pull out and clean, and even then it rarely shows even close to the correct boat speed through the water.

I would like to replace this transducer with a full ultrasonic speed/depth unit but haven't been able to find a transducer with both ultrasonic speed and ultrasonic depth in the one unit. Airmar seem to have only separate ultrasonic transducers for speed and depth which means a haul out and another through hull to install.

Appreciate any advice on replacing this transducer with a full ultrasonic unit?

Also, normal through hull ultrasonic depth transducers seem to work just as well from inside the hull as long as there is a fluid between the transducer end and the hull, eg water or vaseline, or something like that. Has anyone done this as a permanent installation?
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Old 23-08-2011, 10:10   #2
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Re: Replacing Speed / Depth Transducer

Here's what I would do: Replace your thru hull unit with your ultrasonic unit, then put an inside the hull unit in for depth. This assumes you have a solid glass hull. You can try the unit out by using KY or something similar and placing it on the hull.

An alternative is to drill the thru hull while in the water. It's scary, but not all THAT bad. This also assumes you have a solid hull with no core. A cheap portable drill is all you need (you will likely kill it when you punch thru, and you don't want to use a 110v drill). The heal of your foot over the hole or your hand will seal it once you punch thru. Then have a diver friend push the thru hull with a plug in it thru the hole, haul it in, and seal it. Use an in-the-water sealant. Others might chime in here.

Remember, hydrostatic pressure is your friend. If you are 2 feet under water, you have 2 feet of hydrostatic pressure. Imagine a piece of 3" PVC filled with water, and your hand under it. That's all the pressure/volume you are getting.
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Old 24-08-2011, 14:12   #3
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Re: Replacing Speed / Depth Transducer

Hi Bill,

Thanks for the info.
Putting an ultrasonic speed transducer in the current thru hull and an inside the hull depth transducer sound like the best option (I'm don't think I'm brave enough to drill another thru hull while I'm in the water!)

Do you have any suggestions on the best place to buy these 2 transducers that will hopefully connect directly to my Faruno instruments? I'm in Grenada so will have to courier down from the US

Barrie
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Old 25-08-2011, 19:12   #4
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Re: Replacing Speed / Depth Transducer

Barrie, I don't. You might try emailing Faruno and asking them.
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Old 25-08-2011, 19:40   #5
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Re: Replacing Speed / Depth Transducer

Quote:
Originally Posted by Cruisin Cat View Post
Do you have any suggestions on the best place to buy these 2 transducers that will hopefully connect directly to my Faruno instruments? I'm in Grenada so will have to courier down from the US

Barrie
You could try Dave's Marine Electronics. I bought stuff from Dave a few times and always got excellent service and prices.
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Old 26-08-2011, 08:39   #6
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Re: Replacing Speed / Depth Transducer

Thanks for the info
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Old 27-08-2011, 09:34   #7
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Re: Replacing Speed / Depth Transducer

yes, I did this with an eagle 300c
took a 4 inch PVC p[ipe and cut at an angle and glued to inner hull.
then packed it with toilet seal wax, 2 rings worth of wax.
It is working fine and shoots thru the wood.
I mounted it using the transom bracket.
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