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  #1  
Old 07-15-2013
mzw mzw is offline
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Depth Transducer back plates and mounting locations.

Poll: would you ever mount a depth transducer without a backing plate? (Y/N)
Would you ever mount a depth transducer (on a sailboat) mid-ship over the keel? (Y/N)

I'm looking for feedback from the sailing community on these since "John" from Defender industries made these recommendations to me recently. While i have purchased many items from defender over the years, they (Defender) recommended a transducer for my cruising sailboat, which the manufacturer confirmed is not the right choice, but now after the purchase, they do not want to do anything for me...

Lack of integrity from their sales force... and lack of knowledgeable staff!
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Old 07-15-2013
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Re: Depth Transducer back plates and mounting locations.

A little more info would help what are you connecting it to. most of the newer transducers are mounted in the hull and transmit thru the hull. no hole in the hull. what type of boat and hull material? most new transducers are made by Airmar and they are very helpful over the phone.
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Old 07-15-2013
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Re: Depth Transducer back plates and mounting locations.

There's no reason to mount a thru-hull transducer these days. They'll fire a signal through nearly any non-wood cored hull, and the signal loss is minimal at best. For a wood-cored hull, instead of installing a through-hull I would use a transom mounted transducer, similar to those used on bass boats. They are hydro-dynamically designed to pretty much eliminate surface clutter, and can be mounted a bit off-center to minimize turbulence bubbles from the prop or hull.

Good Luck,

Gary
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Old 07-15-2013
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Re: Depth Transducer back plates and mounting locations.

I hope this provides answers to both replies:
the boat is a Morgan 462 ketch. Airmar did not recommend the transducer you both mention because they are designed for a max hull thickness of approximately 1 inch... or so and If i recall work best with cored hulls and the Morgan hull is solid. It would have been connected to a Raymarine depth gauge.

Defender's recommendation was for a DST800 Smart transducer, but after conversations with Airmar, the DST 800 will not work due the large hull offset angle of the Morgan (about 38 degrees, between the bow and start of the keel. I wanted to exchange the DST 800 for a B122 (recommend by Airmar) and purchase the instrument as well, but Defender said no..

Defender recommended mounting it without a backing plate and suggested mid ship mounting as the hull offset angle is much smaller. But with this configuration, my keel would feel the shallow depth much faster than the depth gauge wold show it...
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Old 07-15-2013
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Re: Depth Transducer back plates and mounting locations.

Quote:
Originally Posted by mzw View Post
Defender's recommendation was for a DST800 Smart transducer, but after conversations with Airmar, the DST 800 will not work due the large hull offset angle of the Morgan (about 38 degrees, between the bow and start of the keel. I wanted to exchange the DST 800 for a B122 (recommend by Airmar) and purchase the instrument as well, but Defender said no..

Defender recommended mounting it without a backing plate and suggested mid ship mounting as the hull offset angle is much smaller. But with this configuration, my keel would feel the shallow depth much faster than the depth gauge wold show it...
MZW, what Defender says can be made to work, but I would not recommend it since from what you have told us it sounds like the B122 long-stem transducer, with fairing, is indeed the correct transducer for your boat. The bronze bodied B122 will however be a lot more expensive than the plastic DST800.

You mention that Defender will not exchange the DST800 - does that mean you have purchased the Depth instrument + transducer already? What instrument/package did you buy??

Depending what instrument you have, there is a plastic-bodied version of the B744V which may be a cheaper option than the B122. Again, depending what instrument you have, the DST800 is also available in a B122 housing.

If you have the transducer only, if you contact Raymarine directly you may be able to trade-in the DST800 for part of the price of their version of the B122..
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Re: Depth Transducer back plates and mounting locations.

I don't know how thick the Morgan 46 hull is, however, my Lowrance HDS7 system has absolutely no problem shooting directly through the hull of my 1973 Morgan 33 Out Island. I mounted the transducer just forward of the map table and never had a problem.

Good Luck,

Gary
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