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Go Back   SailNet Community > On Board > Gear & Maintenance > Transducers
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Thread: Transducers Reply to Thread
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Topic Review (Newest First)
09-12-2007 08:53 AM
sailingdog If you go with a through-hull type transducer, you really need to pot the hole for the transducer and the fastener holes. It is probably a bit less work than trying to install a through-the-hull, interior mount transducer in a balsa cored hull—since you would have to cut the inner laminate skin, remove the core and then grind out the laminate and build it back back to a thickness of solid fiberglass that is strong enough to withstand the forces on the hull, and then install the transducer. The extent of the repair to the hull's interior is probably a good deal more involved than the just potting a through-hull and fastener holes.

I'm not a big fan of transom mount transducers, since they still require a hole through the hull for the wiring, or a really long wiring run, and are far more vulnerable to damage. Also, having a transom mounted transducer means that you'll have no warning of sudden shoaling and if you're not paying attention, have a much greater chance of going aground. With it mounted a bit forward in the hull, you can often get a bit of warning and avoid a grounding by changing course or backing.

Quote:
Originally Posted by alecs123 View Post
My boat is a Merit 25... balsa cored.
So you think it's better to install a thru hull transducer to avoid a possible mess with the core? To me is somehow the same, I mean, with a thur hull you make a hole in the boat, with a shoot thru, you only digg from the inside to the outer layer.
I was thinking to epoxy the transducer and then fill the gaps with polyester resin to make sure there are no ways into the balsa.
Perhaps it would be easier to try the transom mount and find a spot where the thing gets wet always (underwater)
09-11-2007 11:19 PM
alecs123
type of boat

My boat is a Merit 25... balsa cored.
So you think it's better to install a thru hull transducer to avoid a possible mess with the core? To me is somehow the same, I mean, with a thur hull you make a hole in the boat, with a shoot thru, you only digg from the inside to the outer layer.
I was thinking to epoxy the transducer and then fill the gaps with polyester resin to make sure there are no ways into the balsa.
Perhaps it would be easier to try the transom mount and find a spot where the thing gets wet always (underwater)
09-11-2007 12:56 PM
sailingdog Alec—

You can't generally install a through-the-hull transducer on a cored hull, unless you are planning on digging out all of the core material. If you do remove the inner fiberglass laminate and core material, you will need to replace it with a fairly substantial fiberglass patch. If you do this repair the wrong way, you risk letting water into the balsa core and delaminating the hull—which is a very expensive repair.

It would help if you said what kind of boat you had.. since the hull design will often affect the placement of the transducer. Forward of the keel, as close to the centerline of the boat as possible is probably a good location, but it will depend on your boat's specifics.
Quote:
Originally Posted by alecs123 View Post
Ok, since I posted this thread got the transducer.. It a Norcross Hawkeye depth sounder...
Has anyone worked with it? I'm planning on installing it this coming weekend.
I'm thinking on a thru-hull instalation, how ever my boat has a balsa cored hull. I willl "digg" into de ourter layar of fiber glass and then fix it to the boat.
What do you think about this setup?
The transducer also works as a transom mount, but I think it wouldn't work because my boat has a reverse angle in the transome, also I'm not sure if the transducer will be underwater all times.
My rudders is a spade type and I think with the movement, air bubbles will be created.
Any way I'll try different spots, but any information is appreciated.
Thanks
Alejandro
09-11-2007 12:39 PM
SEMIJim
Quote:
Originally Posted by sailingdog View Post
It may have a different electronics setup, even if they look alike.
I wrote "identical" and identical is what I meant. Same model number (P79 - comes in two versions). Is operated on one of the two same frequencies (200KHz - which is one of the two P79 models). Same instruction manual.

If I'd wanted to write "looks identical," I would've written "looks identical." (See? I can do it, too .)

Jim
09-11-2007 12:25 PM
alecs123
Shoot trhu hull transducer

Ok, since I posted this thread got the transducer.. It a Norcross Hawkeye depth sounder...
Has anyone worked with it? I'm planning on installing it this coming weekend.
I'm thinking on a thru-hull instalation, how ever my boat has a balsa cored hull. I willl "digg" into de ourter layar of fiber glass and then fix it to the boat.
What do you think about this setup?
The transducer also works as a transom mount, but I think it wouldn't work because my boat has a reverse angle in the transome, also I'm not sure if the transducer will be underwater all times.
My rudders is a spade type and I think with the movement, air bubbles will be created.
Any way I'll try different spots, but any information is appreciated.
Thanks
Alejandro
08-27-2007 08:42 PM
sailingdog
Quote:
Originally Posted by SEMIJim View Post
OTOH, the in-hull Airmar transducer on my Rarmarine depth sounder is identical to the one that I ordered along with my Garmin GPSMap 498.

Jim
It may have a different electronics setup, even if they look alike.
08-27-2007 08:36 PM
SEMIJim OTOH, the in-hull Airmar transducer on my Rarmarine depth sounder is identical to the one that I ordered along with my Garmin GPSMap 498.

Jim
08-27-2007 06:15 PM
sailingdog Yes, I would install the transducer specific to the GPS/Chartplotter/Sounder. The reason you don't want to try and use a transducer with an unknown heritage is that you can't be sure what the signal out format is. Airmar sells much the same transducer with several different electronic configuration, even though the physical configuration is almost identical.

For instance, the DST800 Triducer (speed, depth, temp) is made in four different configurations for Furuno, Raymarine, and TackTick. If you had the TackTick one, and bought a Furuno display head, chances are pretty good that it would fail to work.
Quote:
Originally Posted by alecs123 View Post
SD, I'm thinking of getting a GPS-Sounder combo, would you say it's better to install a new transducer specific for the GPS? and get rid of the old one?
Since I'm not sure I will go with the GPS, just a stand alone depth sounder made sense to me initially, but by what you said I think it's better to use transducers specific to system/brand.
Thanks
08-27-2007 05:57 PM
alecs123 SD, I'm thinking of getting a GPS-Sounder combo, would you say it's better to install a new transducer specific for the GPS? and get rid of the old one?
Since I'm not sure I will go with the GPS, just a stand alone depth sounder made sense to me initially, but by what you said I think it's better to use transducers specific to system/brand.
Thanks

Quote:
Originally Posted by sailingdog View Post
The transducers are probably made by Airmar, who makes them for many of the major manufacturers. Unless you know what brand instrument head was supposed to be used with them, identifying the transducer may do you little good.
08-27-2007 05:47 PM
sailingdog The transducers are probably made by Airmar, who makes them for many of the major manufacturers. Unless you know what brand instrument head was supposed to be used with them, identifying the transducer may do you little good.
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