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Old 03 March 2013, 15:39   #1
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Chart plotter transducer

Hi everyone I fitted a new transducer on my rib over the weekend! The sounder works until we get on the plane but as soon as you get on the plane it stops working! I did notice it seemed to kick up a lot of spray so when I got back in I raised it a bit but I think it might still be too high!

What do guys think?

Also I filled in an old screw hole with some silicone I hope that's the done thing!
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Old 03 March 2013, 17:47   #2
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As far I know once you get up a bit of speed you will not be reading correct depth, only works at lower speeds..
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Old 03 March 2013, 22:44   #3
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Looks like it's mounted too low.

At speed, the water coming out from under the hull will be rising back up. Within that stream, you want the transducer about half-submerged (at the front of the transducer.) That means the centerline of the transducer will be even with the hull at the deepest. Usually a bit higher.

Luck;

jky

Oh, and posting a pic taken even with the bottom of the hull will be a lot more telling than shooting down on the transducer.
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Old 04 March 2013, 02:18   #4
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Quote:
Originally Posted by Ribliam View Post
As far I know once you get up a bit of speed you will not be reading correct depth, only works at lower speeds..
No. Works at all speeds provided it's installed correctly
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Old 04 March 2013, 04:12   #5
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Originally Posted by gooner-paul View Post

Also I filled in an old screw hole with some silicone I hope that's the done thing!
Dig it out, it'll fail. You need Sikaflex 291i in there or epoxy.
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Old 04 March 2013, 07:10   #6
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I think you have mounted it too low - the bottom of the transducer should be more or less level or just below the bottom of the hull. I would have also mounted it further out inside the spay rail.
Mine certainly works on the plane. But it all depends on the individual boat. If all else fails mount it in the bilge near the pump on a bed of silkaflex.
Transom Mounted Transducers
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Old 04 March 2013, 07:32   #7
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Surely it can't ever be too low. It needs to be in the cleanest stream of water possible. The lower the better. What do the instructions say?
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Old 04 March 2013, 07:43   #8
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these are the instructions if it helps
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Old 05 March 2013, 11:58   #9
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I just made a permanent mount for my Humminbird portable sounder. The installation instructions are similar to those posted. It seems to work fine from dead stop to my top speed which is about 21 knots, but omagawd for spray. I have to make some kind of deflector to get that under control. I'm sure it also produces some drag, but I don't know if it is measurable in speed loss.
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Old 12 May 2013, 19:22   #10
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So Thanks for the replies everyone I moved it up and payed with it s few times it's now working (it's giving readings) when on the plane

Now I just have to learn how to make use of it for finding fish lol
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