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Old 18 August 2003, 03:49   #11
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And Finally!!

After ummming and ahhhing over what cause of action to take I decided to go down the silicone route. I purchased a tube of B&Q bathroom sealant for £2.99 and produced a 2 inch bed on the inside of the hull just abaft of the bilge pump (after drying the surface of course). I positioned the transducer in this facing the right way (as if it was mounted on the stern) and left it to set.

Pleasingly I'm able to advise she works perfectly giving a depth reading at full speed and clear bottom - fish - structure display when trolling.

Once again thanks for all your advice and of course to the Forum.

Graeme.
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Old 19 August 2003, 04:12   #12
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I've been following this thread with interest, as my transom mounted transducer, which sits just below the first spray rail, gives very poor readings. If I re-locate it in the deck sump, do I need to simply set its lower face in silicone, or completely encase it? Presumably Sikflex is avoided due to its permancnce?
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Old 19 August 2003, 04:26   #13
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Windchill hi, yep we chose not to use sikaflex because as you say of its performance. Tried to take a seat out that had been glued in with the stuff and failed miserably. Ended up using an angle grinder. just put a smooth layer of sealant in the hull and push the sounder into it. The important bit is to ensure there are no air bubbles which can affect the sounder.

Read another good tip last night of putting the sounder in a plastic bag full of water. Place this in the hull with the boat in the water and see what the picture is like. If it shows a good picture then go ahead and glue. If not just move it to another area.

Pete
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Old 19 August 2003, 08:28   #14
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forward thinking

what about the fls forward thinking transducers, i got one cheap but its supposed to be through hull... despite not wanting a 2" hole in my hull my boat has a deep v stepped hull, which means id need a huge block to straighten the transducer out and get it low enough to see past the front step. Any one had any experience of them?? how could i try it temporary in the hull? its supposed to dangle under the hull be about 1.5"

ta glen
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Old 19 August 2003, 09:05   #15
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Thanks, will try silicone. If that works, perhaps something more permanent.
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Old 19 August 2003, 17:37   #16
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Windchill
your extreme is the same hull as our ocean pro - our transducer was stuck onto a thin coat of silicone over 2 years ago and its still there despite very regular boat use-i dont think you will need anything more permanent!
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Old 21 August 2003, 04:48   #17
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Transducer unit now relieved of its bracket etc. Fits in stern well nicely, but cable looks somewhat vulnerable. Any ideas.
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Old 26 August 2003, 06:29   #18
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Bloody hell!! It works!! Good clear reading, no error messages, steady up to 30kts!
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Old 26 July 2006, 08:01   #19
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As a rib novice I have read all this thread and intend to fit the transducer for my new lowrance M68i with silicon sealant to the inside of the hull. Am i right in thinking this should be fitted right in the middle of the v at the very back of the boat (zodiac yachtline 5m) and underwater.
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Old 26 July 2006, 08:08   #20
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Put it slightly to one side in an area of hull which is smooth on the outside. You need there to be no turbulence, inducing air bubbles, on the outside of the hull.
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