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Old 27 September 2010, 04:32   #1
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Help with Depth Soundings

Any one got any good tips about how to adjust the depth sonar, my unit displays depth ok at low speed under about 10 knots but anything over it just gives up, I imagine its the angle of the sounder but ive tried adjusting and its driving me crazy.
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Old 27 September 2010, 05:45   #2
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Where's the sounder physically attached? I had much the same problem with my Humber except it was 20 knots ish, I think it was because it was half way up the transom towards the tube and so at higher speeds it was in the confused water flow off the hull at speed, rather than being in clear water near the keel. I messed about with the angle but it didn't seem to make much difference.

The Vipermax has a through-hull transducer which is probably the neatest solution if you can do it
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Old 27 September 2010, 07:51   #3
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What type of Transducer is it and what age is it. Show us a pic of it's position on the transom.

As the Bogwotsit said, it should be away from other items, in clear water flow below the keel. I don't think the actual angle should stop it working at speed, just give slightly "off" depths. Does it recover quickly when you slow down???
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Old 27 September 2010, 09:58   #4
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take the transducer off the transom if thats where it is. Throw some water in drain well and put transducer in there with it-keep it propped upright with something. It should work fine then sounding thru the hull (never mind if its supposed to be an outside one they still work). If so dry drain well out and stick transducer down with some clear silicone sealant ( the books say dont use silicone use two pot epoxy-ignore books! With silicon it works fine and you can get it out again easily). Leave to dry and bobs your wotsit. Ours work at 40knots with no problems.
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Old 27 September 2010, 11:49   #5
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Thanks everyone, I also searched this forum and it seems a number of threads on this topic, the concensus seems lots of people have had problems with external hull mounted transducers, the most common fix that works appears to be to shift it inside the hull.

I feel a winter job coming on. Wish the manufactuers would just mount them internally to begin with.

Thanks
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Old 27 September 2010, 13:10   #6
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Ideally you need an area of hull that has no balsa or foam in it, solid GRP
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Old 27 September 2010, 14:46   #7
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it'll ony go thru one layer of material. And it wont go thru air or gas bubbles. The drain well is the place - it should be solid there. My fishing boat never had the transducer bonded in and at every launch over the beach the first job after starting up was to sling a bucket of water in the well. Worked fine and it could be taken out and taken away with us if using someone elses boat when we went to Ireland etc
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Old 10 October 2010, 10:37   #8
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I hope this does not sound like a daft question, but would this fix work when fitting the transducer inside the hull on a searider even if it directly in fornt of the engine?

Cheers

Lee
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Old 10 October 2010, 10:41   #9
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Quote:
Originally Posted by Scousedeli View Post
I hope this does not sound like a daft question, but would this fix work when fitting the transducer inside the hull on a searider even if it directly in front of the engine?
I believe a lot of these terrifically innovative searider chappies do just that, running the cable over the transom into the draining hull and then gluing it to the bottom.
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Old 10 October 2010, 10:48   #10
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I think flooding hulls are daft, but if you want to retain that quirky feature, a transducer in front of the hole would slow the rate of escape of water, when the boat comes onto the plane.
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