Depth Sounder Transducer Placement - SailNet Community
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post #1 of 9 Old 02-20-2012 Thread Starter
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Depth Sounder Transducer Placement

Here's a dumb question
I have little Danica 16 (full keel double ender) and I was going to use eagle sonar/fishfinder unit I have as a depth sounder. and i was wondering where to mount the transducer for it. My boat is fiberglass but the 400 lbs ballast in the keel is nail clippings (the metal kind haha) in polyester resin
I'm wondering if I could get away with mounting the unit off to the side in the lazarette rather than on the outside of the hull?

Any idears?

here's my boat to give you an idea
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Last edited by Windkiller; 02-20-2012 at 02:54 AM.
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post #2 of 9 Old 02-20-2012
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Years ago I mounted my transducer on inside of hull and still going
strong...Few things... hull must be solid, no voids...try to mount
as vertical as possible...I used just plain silicone and moved transducer around until I got good reading (boat in water) and again
must be no voids in silicone or whatever you use to adhere.
While drying important that transducer does not move.
You may have a problem getting a reading when you heel as your
full keel may interfere but that can be a problem with a thru hull
install as well if not carefully placed.
There are existing threads on subject and different ways to achieve.
This is my experience and was a easy job that has lasted years.
Hope this helps,
Hugo
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post #3 of 9 Old 02-20-2012
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Thumbs up

That's a way cool lil' pocket cruiser!
Sailing wise, "you be stylin' "


Find a bilge section to glue in that transducer that's as flat as reasonably possible. If you are out a half foot or a foot from the keel you should be ok. Note that the cone angle of the sound beam will be less likely to hit a shoal draft keel in any case. I once installed an inside transducer aft in a fin keel boat, under the cockpit. In theory this would give me a potential grounding warning a fractional second later than a bow install, but at displacement speeds was not worth argueing over.
What with that keel being so long, the 'ducer is going to be on one side of the other, pretty much no matter where you place it.

When you get a moment, post up some inside photos, as well. Back in the day, the Admiral and I used to cruise for days at a time in a Ranger 20. Small cruisers are both more fun and more affordable.


Best,
LB

ps: there's a museum somewhere in the UK that wants that Seagull back!
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post #4 of 9 Old 02-20-2012
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NICE! ...Dale

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Cal 28, 1967
Lake Superior
Where God got it done!
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post #5 of 9 Old 02-20-2012
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i just mounted a little huminbird transducer inside my 26 ft paceship,it is only for a backup for my regular thru the hull hole tranducer,i had serious doubts the little huminbird puck would shoot thru the hull,i made a little box so the puck would be of the proper angle ,put it in a bagie of water to test it first then mounted the puck using loc-tite 2 part epoxy to actually mount it permanantly,works great!!!,just be sure to use a hard type mounting material because a soft material won't work! it absorbs the ping sound waves
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post #6 of 9 Old 02-20-2012
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Fiberglassing or otherwise sealing a short length of abs pipe cut so that it sits vertical in chosen position .Dia so that transducer fits in it.fill it with water cut slot in cap for wire and ping away.

Last edited by Capt Len; 02-21-2012 at 11:47 AM.
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post #7 of 9 Old 02-20-2012
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Super sweet boat!!! Can see why it would hurt to put a hole in it for a transducer.

For the last two years I have had a transducer mounted under my lazerette on the hull of my Starwind 223. It sits in a glob of silicone. It works OK but is inconsistent - towards the end of last season it become less consistent. One of my projects this spring is to move to the transom so it works more reliably. Figure it is easier to move to the recommended spot than fiddling with workarounds.

sawingknots solution is supposed to work but I am worried if I put it in epoxy and it doesn't work I will shopping for a replacement.
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post #8 of 9 Old 02-21-2012 Thread Starter
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I guess some experimentation will be in order
I've read about the epoxy type of install in a lowrance manual but they didn't have any more particulars
The PVC pipe sounds interesting
Anymore input/ideas is always appreciated
The variety of knowledge and experience available is invaluable!

and thanks for the compliments on 'Nutmeg' my little Danica,she's a sturdy little boat. I'm quite fond of her
I have a couple of pictures that show the inside, not great ones though
It sleeps two quite comfortably and the opening ports help
At best with the hatch down there's comfortable sitting room (heightwise)
There's a lot of storage under the cockpit seats(quarterberths) and in the Lazarette which is quite roomy
The companionway hatch can be removed from it's hinges so you can stand up under the boom to put on pants. They're neat boats. I've heard, from the builder that he sailed one to Hawaii in the late 70s.
I have to build a galley box and a couple other small additions
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post #9 of 9 Old 02-21-2012 Thread Starter
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PS ..they can't have my seagull !!
I have a couple. That's a &^$#&$# luxury model with a clutch and weedless prop!
Oh the good life!
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