Curtis;

 

A depth sounder installed in the back of the boat won't work well, if at
all, when under weigh. When sailing the turbulence from the keel will
interfere, and when motoring it will be the pressure waves generated by the
prop. (I think the transom mounted sounder on my 19ft Grady White works OK
when below about 10MPH becayse it is about 3 ft outboard and 1 ft ahead of
the outdrive. But you would be hard presses to get much offset from the prop
on a sailboat.)

 

Garmin recommends that the transducer be installed forward of the leading
edge of the keel on a sailboat.

 

I have am Airmar P79 transducer, which comes with a mount designed for
installation inside the hull. It is installed on centerline just forward of
the back bulkhead for the v-berth. My hull is cores, so I had to find a
place where there was solid glass for the installation, or do surgery to
remove a bit of the inner fiberglass skin and core (which, frankly, gave me
the willies).

 

On my 25, which is not a cored hull, I was able to use a location in the
forward corner of the locker under the port settee. About even with the
leading edge of the keel and a short easy run for the wires to the location
of the display and the breaker panel.

 

Your plastic bag does not need to be filled with oil, water will do.

 

Hook your transducer to the sounder, and hook the sounder up to power, then
turn it on. Place the bag on the inside of the hull in a location where you
think you would like to install the transducer. If you get a depth reading
the location will work. If you don't get a reading, try other locations
until you find one that makes installation and access easy, and where the
transducer give a good signal.

 

Lots of guys on the list have had good luck installing transducers in a
puddle of silicone or epoxy. But with either you can get air bubbles between
the transducer and the hull that make it not work.

 

I prefer to mount the transducer in a "wet box." On the 25 I used a 3" or 4"
PVC cleanout cap (with a threaded plug). I cut the end of the cleanout at an
appropriate angle, and then shaped it to fit the curve of the hull. Then cut
a vertical slot in the threads the width of the transducer wire diameter.
Epoxy the resulting wet box to the inside of the hull, 

Fill it part way with mineral oil. Put the transducer in, and screw the plug
down tight enough to seal the hole where the wire comes out.

 

Or, as I said, use a transducer that comes with a collar that you epoxy to
the hull.

 

Good luck.

 

Rick Brass

 

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Curtis
Sent: Friday, December 20, 2013 8:29 AM
To: CnC-List@cnc-list.com
Subject: Stus-List In hull transducer location

 

I have purchased a new echo50s for Christmas. I'm trying to decide were to
install the inhull transducer. I have had some tell me that I should put the
sensor in a zip-lock bag with mineral oil to find the best spot in the hull?


On A C&C 30 MK1 has anybody installed one in there hull? I have 2 threw
hulls under the forward head bilge. Both will not work. any Ideas of what to
look for in the bag of oil with the sensor in it to determine where is the
best location?  I have a depth sounder forward now. It would be nice to have
one in the back of the boat somewhere.


 

-- 
"Sailors, with their built in sense of order, service and discipline, should
really be running the world." - Nicholas Monsarrat

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