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Old 08 August 2007, 17:36   #1
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transducer/help

can anyone tell me how to get accurate info when at speed as i have never had this with any rib where it is mounted on the stern. i dont want to have to put it on the skin or through the hull.
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Old 08 August 2007, 18:12   #2
alt
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Quote:
Originally Posted by tango1 View Post
can anyone tell me how to get accurate info when at speed as i have never had this with any rib where it is mounted on the stern. i dont want to have to put it on the skin or through the hull.
Having the same problem with my sports cruiser. Solution is to install an in-hull transducer. I was told you can use the existing transom mounted one but for the sake of a few dollars i'd just buy one from the states. I have the advantage in the sports cruiser as there is nothing between the bilge and the water (apart from timber and GRP obviously), not too sure how you'd manage it on the RIB
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Old 08 August 2007, 18:13   #3
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Silicone it into the hull so I have been told!!!
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Old 08 August 2007, 18:14   #4
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Originally Posted by codprawn View Post
Silicone it into the hull so I have been told!!!
Yup, heard that myself, making sure there is no air bubbles. However isin't there a hollow between the floor/underside of the hull on RIB's?
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Old 08 August 2007, 18:19   #5
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you are right.

the deck is sealed i used silicon on the hard boat i had and it was perfect. but on a rib this is not the best option.
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Old 09 August 2007, 03:15   #6
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The local Rib dealer over here, uses "Marine Epoxy", from Plastic Padding, to affix the transducer to the floor of the hull.
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Old 09 August 2007, 03:32   #7
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Just to clarify:

Can you get to the inside of the hull near the centre/keel line close to the stern ? If not then I understand your problem but after reading several people's reluctance to use a transducer bonded to the hull I have to say it was a great quick fix for me.

I had a transom mounted transducer which gave me water temp. and water speed but whenever travelling above 5 knots or so it would lose the ability to give the depth. I moved it around but could not find a suitable, non turbulent place. I got a Airmar 'puck' type unit from JG Tech for £80 which was a doodle to fit, just Sikaflex the flange on the tube then fill with castor oil, £1 from chemist then insert transducer - now it works at all speeds and I can live without the water temp/speed. Airmar make a wide range of transducers to suit a variety of head units.

If you need to try many positions for the transom mount unit I can only suggest mounting a strip of acetal/nylon/wood etc along the bottom edge and then you can move it around all the time to find a suitable place without riddling the transom with holes. Just resin up any redundant holes after finding a permanent home for the transducer.
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Old 09 August 2007, 08:17   #8
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If you're stuck with transom mounting then play around with different angles/heights. I personally find you need to increase the projection below the hull and angle by about twice that specified in the instructions.
  1. Make sure the front of the transducer is higher than the back - roughly a 10/15 degree angle
  2. Make sure the front of the transducer is at least 5mm below the hull of the boat.
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Old 09 August 2007, 17:47   #9
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thanks everyone!

i think everyone here is correct,but i have the transum mount at the moment and i ill try moveing it a little but i really dont want to go to the bother of cutting the deck to get to the hull. many thanks to all.
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Old 09 August 2007, 17:52   #10
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Tango,

What boat is it and you got any pics of the transom well or rear deck area.

Regards NR.
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