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post #1 of 26 Old 04-23-2012 Thread Starter
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Shoot Thru Hull Transducer

I have a 27' Ericson and am trying to install a Hawk Eye shoot thru hull transducer.

Has anyone installed this unit, where did they mount it, etc?

Iíve hooked up the display and the transducer works when I hang it overboard, but I canít find a spot to get a reading through the hull.

HelpÖ
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post #2 of 26 Old 04-23-2012
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I heard that using a zip lock bag full of water can be used. By moving it around the hull where you would like to mount it and shooting through the bag of water. Are you going to epoxy it or make a bath for it?

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post #3 of 26 Old 04-23-2012
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Re: Shoot Thru Hull Transducer

Although I have no direct experience with your boat, I can say that the ziplock bag works well to identify the best positioning. Also look for an area where there won't be too much turbulence in the water. Some boats have problems if it placed too close to the keel.
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post #4 of 26 Old 04-23-2012 Thread Starter
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Re: Shoot Thru Hull Transducer

I've tried the ziploc bag and also sticking it in a wad of Vaseline. Neither have worked yet.

I'm wondering if the hull is cored or has a false bottom in the berths.

Anyone know how "flat" does it has to be with the bottom of the Bay? Wondering if I need to get it closer to the centerline for the sonar to bounce properly.
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post #5 of 26 Old 04-23-2012 Thread Starter
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Re: Shoot Thru Hull Transducer

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Originally Posted by ldog68 View Post
I heard that using a zip lock bag full of water can be used. By moving it around the hull where you would like to mount it and shooting through the bag of water. Are you going to epoxy it or make a bath for it?
I'm planning to use a two-part epoxy to adhere it once I find a place that gets a reading.
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post #6 of 26 Old 04-23-2012
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Re: Shoot Thru Hull Transducer

Hmm...well, my kit is different, but I can see why you are baffled. What you are trying should work! On my 32' I found a good spot amidships, 1/3rd up the hull between the keel, and the waterline. I angled the transducer to point straight down. My model also has a sensitivity adjuster on the display for fine tuning.
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post #7 of 26 Old 04-23-2012
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Re: Shoot Thru Hull Transducer

First and foremost, be sure that you do not have a cored hull. I doubt that it is, but you may wish to check with the manufacturer.

Next, the position of the transducer should be relatively close to the stern, and about halfway between the keep and the waterline. This will provide you with a relatively flat location, which is the best you can hope for. Don't position the transducer close to the keep because part of the signal cone may be blocked.

Be sure you have the correct transducer. A standard, exterior mounted transducer will usually not function when mounted inside the hull--it doesn't provide sufficient sensitivity.

While it is unlikely that there is a false bottom in the Catalina 22, there may be a wooden platform encased within the fiberglass in the area you described. Try locations farther aft and see if this makes a difference. You will have to shoot through a zip-Loc bag filled with water and no air bubbles at all. No transducer can shoot through air--even a small amount.

Hope this helps,

Gary
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post #8 of 26 Old 04-23-2012
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Re: Shoot Thru Hull Transducer

The best location on a sailboat is just forward of the keel. In a powerboat aft is where you want it. I have installed quite a few, most with epoxy but a few with silicone. I prefer the epoxy.

When you are testing it place the transducer in the baggie of water. If the centerline doesn't work try a bit to each side. There shouldn't be a liner in a locker - you can tell usually by the finish - smooth means a liner, roving showing means no liner. I don't think there is any core in the Ericson 27.

Brian
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post #9 of 26 Old 04-23-2012
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Re: Shoot Thru Hull Transducer

Absolute flatness shouldn't be required to get some reading from it--ours is a couple of inches off center. But I would think the more angle you have the less accurate your readings will be relative to the depth right below you. Make sure you aren't right over your keel, eh? Mine is right next to where the thru-hull for the old transducer was.

Tom K

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Northern Chesapeake Bay

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post #10 of 26 Old 04-24-2012
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I just picked up a Lowrance 5 chartplotter/fishfinder at a boat show.

I want to install mine forward of the keel but the factory rep at the boat show said to put it aft as there was too much turbulence forward of the keel. It this accurate?

Also, how far forward can the sonar see stuff?

(funny thing is that I haven't even closed on the boat yet..lol)

HANUMAN
'88 C&C 30 MKII
NOANK, CT

Last edited by RobGallagher; 04-24-2012 at 10:15 AM.
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