goo and speed transducers - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 02-17-2009
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goo and speed transducers

while painting the inside of the hull under the vberth on my '73 Pearson 30 I stepped on and cracked the plastic shroud around the old (original?) standard horizon speed transducer. long story short, the shroud contains a clear goo like liquid that the transducer sits in. Weird. Should I ..
a) tape, plastic and 5200 the transducer back in the cap & hope for the best
b) call standard horizon, scour ebay for a new old one etc
c) stop being so cheap and buy a Raymarine st 40
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Old 02-17-2009
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I assume that was a shoot-thru-the-hull type transducer. They need to have no air between them and the hull. Folks use mineral oil, silicone, epoxy, or even wax to get a good continuous connection. You might be able to clean it out and refill with wax and then press the ducer into the wax (wax rings that seal toilets to the floor is a good, cheap source of sticky wax). With wax you won't have to worry about it flowing out of the cracked housing. And if it doesn't work, you're no worse off.
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Old 02-17-2009
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thank you, very helpful. still getting to know the boat and some of its original equipment!
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I assumed this is a shoot-thru (in hull) transducer. If this is a transducer installed in a thru-hull hole, cracks have other worries, such as leaks. But thru-hull transducers don't have accompanying goo, so far as I know.

And if the crack didn't make the goo leak out, repairing /taping the housing may be all you need, as long as the transducer doesn't have an air gap.

Others would know better, but I kind of thought that transducers installed back a ways usually went in thru-hulls. Might not be original.
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Old 02-18-2009
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I don't believe that is the case here, since he said this is a speed transducer, and most speed transducers mount through the hull since they have a paddle wheel.

If it were a depth transducer, it might be because it was setup to shoot through the hull... but I've never seen a speed transducer that shot through the hull. IIRC, even the ultrasonic speed transducer requires it be located in the water.
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Hah, you're right, Dog. But the goo thing made me think that he was talking about a depth transducer. johnp30, is this indeed a speed transducer? Wire goes to knotmeter?
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good catches guys. I thought it was the speed ducer because I was thinking the paddle wheel was roughly in this spot -- a few feet forward of the head on the starboard side. Turns out it is not. I think the speed ducer must be the one further aft under the starboard setee. So this thing with the goo in it under the vberth must be a shoot thru the hull depth ducer. I will trace the wires this weekend. There's another wrinkle, though -- directly under the water tank in the vberth is a metal (bronze, i guess) plug that stands up out of the hull about 2-3 inches and has a wire going into the top. I'm guessing that this might be my functioning depth ducer and the other goo thing could be the original??? I have to trace wires and test -- sorry about the ignorance, just trying to get to know the boat and get to the bottom of it!!
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If it is the depth transducer, you can use mineral oil to refill the thing.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
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