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Author Topic:   Thru-hull Transducers In OUTRAGE 23 Hull
onokai posted 06-07-2006 03:17 AM ET (US)   Profile for onokai   Send Email to onokai  
I have a 1998 OUTRAGE 23. My FURUNO Nav-Net system can take a 100-watt transducer [perhaps means a 1,000-Watt transducer]. [I] have the standard AIRMAR plastic 600-watt [transducer] on transom now. The only place to put the AIRMAR thru-hull B260 is the putty box on port side near the transom and up on the last chine exactly opposite the live bait take up on starbard side. Whaler has a spot here but [it is] far from optimal. The trailer bunks are far enough to pose to woes but I am thinking this high up is not good. [If you have this boat and transducer tell me ] how is it working and which AIRMAR transducer are you using. [I] need the [fairing] blocks so it will set level as well. I fish for tuna and need more [power from the SONAR]. Mark
oroseiwhaler posted 06-07-2006 04:51 PM ET (US)     Profile for oroseiwhaler    
onokai--I have the same boat annd same year like you. When [I] bought [the boat] [I] mounted a [thru-hull] transducer there on the transducer mounting location. The mechanic cut the [faring block] the wrong way and so he had to cut it again. It went quite small in height. Due [to the nearness of ] the strakes, the transducer won't read anymore over 8-knots. [I] made a L-shape mounting and moved it to the transom between both motors, and now [the transducer] works well up to 30 knots. Cutting the [fairing block] with care and only the minimum necessary may give you better results and reading at higher speeds, but the problem with the [unrecognized--possibly means "trailer"] may be still [a problem] for you. My friend's boat has a 600 watt AIRMAR plastic transducer like you and it reads quite well up to 500-foot at 10 knots or 1000-foot when drifting. Maybe you have to adjust the inclination and/or the mounting position of your current transducer to gain better results. Consider that the surface of the transducer has to [stick out] as much as possible [from] the hull to read without [being disturbed by] bubbles.



jimh posted 06-07-2006 08:14 PM ET (US)     Profile for jimh  Send Email to jimh     
It is my impression that one of the reasons for using a thru-hull transducer on an inboard boat is to be able to locate the transducer forward of the propellers. In this way the transducer is upstream of the propellers and all of the bubbles they introduce into the boat's wake. On an outboard powered boat, a transducer mounted on the transom is still upstream of the propellers. I don't see why you could not mount a transducer on the transom of an outboard boat and not get the same results you would from mounting it slightly more forward and through the hull. You could extend the running surface of the bottom slightly if you wanted to make the mounting accommodate a thru-hull style transducer.
onokai posted 06-08-2006 03:25 AM ET (US)     Profile for onokai  Send Email to onokai     
I have a good 600 watt transom mounted transducer that shows great bottom and reads at up to 13 knots (which is about top speed). I fish for Albacore tuna offshore. I thought a high-performace thru-hull with 100 watts would show fish better. I spoke with AIRMAR sales as well as a marine electronics installer near a larger Boston Whaler boat dealer ( I live in the sticks) . He said forget the high performace thru-hull as the difference for my apllication would be zip. We all know Boston Whaler builds a great fishing boat. Then drops the ball by not providing a good transducer loction. The putty box is up on the last highest strake, and it is at an angle so the double bolt (forward one) on the high speed flairing is going to just catch the outer fiberglass skin. Hey Whaler--you listening? Boat work never ends. Thanks for the feedback.
oroseiwhaler posted 06-14-2006 03:50 PM ET (US)     Profile for oroseiwhaler    
your transom mounted transducer is mounted too high or behind some strake or water inlet. Changing the location or the height (how much the transducer comes out of the hull bottom) should make it reading up to 20/25 knots.

1000 Watt transducers usualy give no significant better readings on low depth up to 500 feet, theyr goal is to go deeper than a 600 watt transducer.

Airmar has a new 1000 Watt model with 7 pizos instad of 2 and as the describe the definition of the signal will much better due the 7 pizos wich makes sense to me, but publicity and reality may differ.....

I agree, mounting a tru hull transducer on (at least) a 23 Outrage is a sad and nasty story and the high speed fairy is almost impossible to mount.



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