[Public-List] depth sounder

Fri Jun 6 04:01:55 PDT 2014

When I installed my Garmin 541s I bought an Airmar transducer with an
in-hull base that adjusts to the angle of the dead rise. I installed it on
the port side just aft of the bulkhead to the head in the main cabin. I
liked the idea that I did not have to drill a hole in the boat to install
the transducer. It was simple to install, just clean up the selected
location with acetone and I used 5200 to 'glue' the base to the inside of
the hull. The only hard part was to figure out the angle. After doing a lot
of geometry I figure it to be 22 degrees, then confirmed that with the level
app on my cell phone. I dialed the base to 22 degrees and set it in place.
Once the 5200 setup, I filled it with mineral oil and connected the
transducer to the GPS/chart plotter. It worked immediately and has ever 
since
(5 years). I adjusted the offset in the GPS so I get true bottom depth. I am
sure you can make a homemade version of this with PVC pipe, but this was
really easy...of course everything was brand new.

Here's a link to the Airmar component

http://www.airmartechnology.com/2009/products/marine-product.asp?prodid=52&manf=All

~~~_/)_/)~~ Mike Lehman ~~_/)~~~

-----Original Message----- 
From: GLENN P
Sent: Thursday, June 05, 2014 11:53 PM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-List] depth sounder

Wow, conjurs up all kindsa possibilities... cheap ballast substitute? ... 
Get plastered on Friday Night?? Use it in Mexico to fight Monte's revenge, 
small quantities most likely, giving rise to a huge amount still on board?

Perhaps Its not plaster after all, maybe its really cocaine and you are 
either now immensely rich or in a lot of trouble with the Feds.

Might be a good idea to donate it to Mr. Dumpster.

gpb

----- 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 5, 2014 7:44:23 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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