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  OUTRAGE 23: Through-Hull SONAR Transducer, Putty Box

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Author Topic:   OUTRAGE 23: Through-Hull SONAR Transducer, Putty Box
onokai posted 07-17-2008 01:15 AM ET (US)   Profile for onokai   Send Email to onokai  
Talked to [Chuck Bennett] today at Boston whaler about mounting an AIRMAR 1-kW B 164 20-degree tilted transducer in my 1998 Outrage 23 in the non-cored 5-inch round putty box. He gave it two thumbs up. He seems to really know these hulls. Now to drill that massive 3-3/4-=inch hole with a holesaw. I'm getting a new bit for my Milwaukee and will coat the inside area with MarineTex before bedding the transducer with 3M-4200. This job takes a bit of contemplation as it really goes against all reasoning with a Whaler hull to punch a big hole in it. I;ll post some photos at my flicker site when done and put the link here. I'm really looking forward to better furuno performace, Mark
deepwater posted 07-17-2008 09:11 AM ET (US)     Profile for deepwater  Send Email to deepwater     
good luck with that,,how will that set with the trailer rollers,,clearance OK?
Jefecinco posted 07-17-2008 11:25 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
That's a big hole in the bottom of an Outrage.

Have you considered fabricating a mount in order to mount the transducer on the transom? I've seen a large Airmar transducer of about the size you have, mounted to a transom using a very nice mounting bracket fabricated from Starboard marine lumber. The design was similar in concept to a very heavy duty cup holder.

The bracket was mounted using two screws in each of two vertical slots about four inches long on each side of the bracket. A piece of approximately one inch thick Starboard was attached the the transom of the boat. The bracket was attached to the Starboard on the transom with the aforementioned screws. The transducer cable was routed through the outboard motor well drain.

An advantage of transom mounting is the ability to more easily change to another transducer which may be of a slightly different size. Another is that if it is necessary to remove the transducer for repair the boat remains usable.

There have been some discussions of a similar nature on THT.


onokai posted 07-18-2008 01:33 AM ET (US)     Profile for onokai  Send Email to onokai     
As far as clearance, the [AIRMAR 1-kW B 164 20-degree tilted transducer] is designed to sit on bunks as it only sticks down less than 1/4-inch and is a brass circle. I saw this done and it was very clean. I thought about the 1-kW [transom mount] transducer on a stick that you move up and down, but with the Pacific kelp and human error I choose to go this route instead. I already have two transducers on the stern now. They kick up if you hit something, and they both have kicked more than once. This [AIRMAR 1-kW B 164 20-degree tilted transducer] was designed for this use: high speed planning hulls on trailer boats with bunks. Chuck at Whaler said he knows a fellow who did it with superb results. The new hole saw showed up today. The boat is in the canvas shop till Tuesday. So there is still time to get cold feet. The putty box is made for just a hole. I'll take photos and post them on my flicker site with a link here. Mark
kglinz posted 07-18-2008 08:15 AM ET (US)     Profile for kglinz  Send Email to kglinz     
Drill a small hole and check the thickness of the hull before you drill your 3-3/4 hole. I had a B-60 installed and was told to expect a 2-1/2-inch thickness and found almost 3-1/2-inches. The transducer was just barely long enough. My boat is a Conquest, but it could happen on yours.

Kemp Lindsey

onokai posted 07-18-2008 11:43 PM ET (US)     Profile for onokai  Send Email to onokai     
Chuck Bennett really knows his stuff, really helpful, too. Mark

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