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Author Topic:   through-hull transducer
dboy posted 10-10-2002 05:48 AM ET (US)   Profile for dboy   Send Email to dboy  
Has anyone mounted a through hull transducer on these newer style outrages. My transom mount will not "see" the bottom over 200 feet unless I am sitting still. What brand, how, and where would one mount one of these.
tully_mars posted 10-10-2002 08:52 AM ET (US)     Profile for tully_mars  Send Email to tully_mars     
Not a good idea on Whalers of any generation to install a thru hull. Hard to seal around and may leak one day and let water into the hull.

I have had no problems with transom transducers on either of my newer "post-Classic" boats, I would suspect your transducer is mounted such that when you are running it is not in the water.

Make sure the base of the transducer is about 1/8" below the transom of the boat and that it is angled a little up in the front so air is forced out. If it is angled down in the front the transducer then it will cause an air pocket behind it.

My boats are a 21' Outrage (1996)and a 23' Conquest (1998).

Tully Mars

bsmotril posted 10-10-2002 11:13 AM ET (US)     Profile for bsmotril  Send Email to bsmotril     
There is a circular recess molded into the bilge inner hull to take a shoot through or through hull transducer. At this spot, there is no foam and the inner and outer hull make contact. Before drilling through that spot though, I would try to fabricate an oil filled well and try the transducer as a shoot through.
David Pendleton posted 10-19-2002 03:15 PM ET (US)     Profile for David Pendleton  Send Email to David Pendleton     
BillS is right, the Conquest/Outrage hulls have special mounting areas for through-hull transducers.

I had originally purchased a bronze Raytheon TH to connect to my L470. Unfortunately, the angle of the (outside) hull at the mounting area would have required me to install some sort of fairing to ensure the TD shot straight down--more work than what I wanted to undertake.

I went with the the Raytheon transom mount instead and it works fine. The speedometer functionality isn't worth a damn, however.


David Pendleton posted 10-19-2002 03:22 PM ET (US)     Profile for David Pendleton  Send Email to David Pendleton     
Incidentally, dboy, you might want to check the following:

Occasionally, my transom-mount transducer will 'flip-up' at high speeds, rendering it useless. This is a safety mechanism intended to save the TD incase of contact with an object. When I stop, or idle, it works fine.

My transducer will transmit at 50 or 200kHz, I can't remember which is better for deeper water, but one of them is (salt vs. fresh water affects it also, I know).

You might try switching frequencies if your fishfinder supports it. Mine (a Raytheon L470) will run in 'split' mode, showing the signal from both frequencies.

When I run on L. Superior, I often find myself in more than 200' of water, and I've had no problems shooting the bottom using either frequency.

I hope this helps.


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