[Public-List] depth sounder

[John Birch]

Kris, the Plaster is for doing fresco's ; )

Hopefully, Doug didn't use it as trim ballast


----- Original Message ----- 
From: "Kris Coward" <kris at melon.org>
To: "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org>
Sent: Thursday, June 05, 2014 10:44 PM
Subject: Re: [Public-List] depth sounder


>
> Ok. So mineral oil straight to the hull is fine. I was just asking
> because I got most of a bag of plaster with the boat, and still have
> no bloody clue what the PO used it for, so when I read "plastered to the
> bottom" I was wondering if that's what the plaster had been for (and
> whether I should repeat the process with plaster again). I guess there's
> a lingering plaster mount for something elsewhere on the boat, that I
> still have yet to find (or the bag was just inherited multiple times).
>
> Cheers,
> Kris
>
> On Wed, Jun 04, 2014 at 09:29:41PM +0000, GLENN P wrote:
>> Kris,
>>
>>
>> I think what Gordo was saying is that tranducers need some sort of liquid 
>> medium to transmit signal through the hull into the water and return. 
>> West Marine carries replacement transducers with little round universal 
>> plastic brackets that you can affix to the inside of the hull with 5200 
>> or other adhesive. As I remember one adds maybe 1/2 cup mineral oil into 
>> the bracket and then plugs the transducer into the bracket with the 
>> mineral oil bath. This will get you up and running with a permanent fix 
>> with about an hours prep time.
>>
>>
>> Dolce has an old school 2 quart FG container glassed into the hull that 
>> could hold a hull transducer through the lid,s sitting internally in a 
>> mineral oil bath, but not exit the hull. The newer DIY transducers are 
>> much easier to work with. When I replaced my old depth sounder witha 
>> chart plotter few years ago, I mounted one of these units in the existing 
>> FG shell to protect the transducer from the usual bilge assaults, but 
>> they can go anywhere convenient, so long as they are pointed basically 
>> straight down, perpendicular to water line.
>>
>>
>> Glenn B
>> Dolce 318
>>
>> ----- Original Message -----
>> From: "Kris Coward" <kris at melon.org>
>> To: gewhite at crosslink.net, "Alberg 30 Public List -- open to all" 
>> <public-list at lists.alberg30.org>
>> Sent: Wednesday, June 4, 2014 2:04:51 PM
>> Subject: Re: [Public-List] depth sounder
>>
>> On Wed, Jun 04, 2014 at 10:45:12AM -0400, gordon white wrote:
>> > But I have used a depth sounder sending its pulses through the
>> > fiberglass bottom. You need a zip-loc bag of water plastered to the
>> > bottom (inside) to transmit the signal.
>>
>> When you say "plaster" what sort of material do you mean? The old depth
>> sounder transducer on Candy Cane seems to have bitten the dust, and it's
>> installed in an ABS tube glued to the hull, filled with mineral oil, and
>> capped. I'm kinda reluctant to remove the old tube, rather than just
>> building a new one, and was wondering if there's any particular magic to
>> be applied with the gluing &c..
>>
>> Thanks,
>> Kris
>>
>> -- 
>> Kris Coward http://unripe.melon.org/
>> GPG Fingerprint: 2BF3 957D 310A FEEC 4733 830E 21A4 05C7 1FEB 12B3
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>
> -- 
> Kris Coward http://unripe.melon.org/
> GPG Fingerprint: 2BF3 957D 310A FEEC 4733  830E 21A4 05C7 1FEB 12B3
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> Please support them.
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