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 Best location for thru-hull transducers		  New Topic  Topic Locked
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CatalinaGuy
1st Mate

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USA
55 Posts
Initially Posted - 03/16/2003 :  20:57:36  Show Profile
I'm now the proud owner of new instrumentation for my C25. I have a multi speed/depth/temp and a wind speed/direction instrument. The multi has two thru-hull transducers one for depth the other for speed and temp.

The mounting instructions state the best location is just forward of the leading edge of the keel, close to the centerline. The only convenient place in the C25 is the access locker under the v-berth. Locations closer to the keel would require some kind of custom access panels.

Where have others located their transducers?

Doug Hibberd, 'Shiraz'
C25 SK/SR 1983
Austin, TX
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William Matley
1st Mate

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52 Posts
Response Posted - 03/16/2003 :  21:33:15  Show Profile
I just glued my transducer to the hull, rather than make any more holes to worry about. I thought a lot about a proper location and I decided on a location on the hull, right under my feet when I am standing and holding the tiller.

When I am looking for the bottom I am usually looking for an anchorage in some bay or near a shoreline. What I do is to stear toward the shore slowly and do a big sweeping turn as I get close in to shore. The big turn gives me a clear view of the bottom and so I like knowing what's the depth under my feet. Then when I find a good spot I complete my turn and go away from shore until I find the proper depth and the amount of anchor line scope to suit the conditions. I ease to a stop, drop the anchor and back down the engine, laying out line as I head to shore in reverse. When I have layed out the correct amount of line, (the line has markers to tell me how much line is out) my wife takes a bite on the bow cleat and I wait until the anchor takes hold. If I get a good hold from the anchor, I increase power until I put a hard strain on the anchor, digging the anchor into the bottom. If I do this right, I have 7-10 ft of water under my feet. I usually tie a stern line to a tree on shore and this insures I'll be in the same place in the morning.

Each situation is different but that's what works for me.
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tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 03/17/2003 :  08:37:41  Show Profile
Hi Doug,

My '83 came with factory installed depth and speedo mounted as you describe with access under the V berth. It's a little crowded there with the head sink discharge there also. The manual that accompanied the instruments recommended that they be placed as they were. Speedo to the right and depth to the left with the sink drain aft of both. It seems that both instrument sending units work most accurately with as little water flow disturbance as possible. It also alerts you to depth shortfall sooner than if placed aft.

Val on the hard DAGNABIT

Val Bisagni]<img src="http://im1.shutterfly.com/procserv/47b3df11b3127cce94709c5ff2e90000000010" border=0>
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John Mason
Admiral

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USA
687 Posts
Response Posted - 03/17/2003 :  16:09:14  Show Profile
My knotmeter transducer is beside the leading edge of the keel on the starboard side. There's an access hatch in the cabin sole just before you step into the head. It's under that.

John Mason
<img src="http://www.users.qwest.net/~jamason/ali.jpg" border=0>
pronounced "Ali Paroosa"
1982 - FK/SR #3290
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matsche
Captain

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USA
280 Posts
Response Posted - 03/17/2003 :  18:49:11  Show Profile
Mine was installed from the factory just underneath the quarterberth, just starboard of the stairs. Not the location I would have chosen, but access is very easy. I think under the v-berth would be better for the reasons already stated, but since we're only moving at 6 knots, I don't know that it really matters that much.

John Matsche 1985 Cat-25 TR/FK
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.