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Anyone ever see a ducer like this?

Old 10-11-2011, 04:21 PM
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Default Anyone ever see a ducer like this?

Posted for a member on CAS...



At least, I assume it's a ducer...
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Old 10-11-2011, 04:50 PM
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I don't even know whats its attached to?
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Old 10-11-2011, 04:55 PM
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That cant be good for the gas mileage.
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Old 10-11-2011, 05:48 PM
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wow.. hope they have a plug for the hole that will leave if they ever hit something!!
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Old 10-11-2011, 05:53 PM
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Sure it's not something to do with grounding to prevent galvanic corrosion? I've seen similar things on transoms...never on the bottom. Seems like it would cause too much turbulence to be a transducer!?!?
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Old 10-12-2011, 02:51 PM
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That does NOT look to be ducer!! That is the raw water intake strainer for the motor or Genset. Your looking at it from the stern, looking forward. If you took the picture from the other side, you would see a sea strainer screen on it.

Looks like this:

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Old 10-13-2011, 12:35 PM
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Looks like the transducer off an Interphase Twin Scan.
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Old 10-13-2011, 01:22 PM
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Birdman-
I think you are mistaken. I've never seen a RW strainer-scoop pickup with fairing block (such that it is ) to make it plumb to face sea bottom and have unnecessary impact risk. Further , such an installation would probably tend to reduce intake flow & redirect around to the sides of such an intake.

But it does appear to be a view from it's aft end. Presumably that would not be a desireable T/D installation on a planing boat but would not be a big deal on something like a harbor launch.
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Old 10-13-2011, 02:29 PM
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Forward facing sonar?
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Old 10-13-2011, 02:54 PM
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Could that be one of the low frequency "blocks" we used to use with DF systems that are usually mounted in a shoot through box or chest with "window". Can't tell the dimensions from the pic but i've monted several 28 and 50 khz 2kw pucks that look about the same size. Maybe one of those that someones 5200'd to a fairing wedge? Definitely doesn't look like the Interphase ducers I've installed, side or forward looking but Halloween scary nonetheless!. What does the forward end look like? Bet she need a lot of tab to stay level!
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Old 10-14-2011, 05:37 AM
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Wow.... some really silly responses here. A strainer? Really Birdy .... a strainer?

Looks to be an older transducer from Furuno. The older Furuno thru-hull transducers were round.
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Old 10-14-2011, 10:43 AM
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Looks like a strainer in front with a ducer behind it (from the perspective of the picture) to me.
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Old 10-14-2011, 12:02 PM
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Yes chrisrack, REALLY. It is a Inboard intake strainer. REALLY.

It looks EXACTLY like both of mine on my Rampage. I wish I had a picture with me. I have almost the exact picture of mine at home and will post it later. It looks identical to that from that angle.

A transducer would not be angled forward. If it is, it is installed incorrectly. I have also never seen a rectangular transducer. They are round, oval, or elongated, not rectangular or facing forward.

If you have never seen an inboard EXTERNAL sea strainer installed, you might not know what they look like. Here is a side-view diagram of how they are installed. The part we are looking at here, is where it says "Grocco External Strainer". We are looking at it from the LEFT side of this drawing, which is the stern of the boat, and we are looking forward toward the bow (to the RIGHT side of the diagram).


And PS- that may be a zinc on the back of it up against the hull.





Last edited by Birdman; 10-14-2011 at 12:20 PM.
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Old 10-14-2011, 12:24 PM
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Originally Posted by TTaxi View Post
Birdman-
I think you are mistaken. I've never seen a RW strainer-scoop pickup with fairing block (such that it is ) to make it plumb to face sea bottom and have unnecessary impact risk. Further , such an installation would probably tend to reduce intake flow & redirect around to the sides of such an intake.

But it does appear to be a view from it's aft end. Presumably that would not be a desireable T/D installation on a planing boat but would not be a big deal on something like a harbor launch.
I don't see any fairing block on there. It looks like an oxidized zinc on the back end of the intake. I've seen them installed that way for extra zinc protection of a boat that is left in the water for long periods.
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Old 10-15-2011, 01:50 AM
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I don't know what you are looking at Birdy ..... I don't see anything square in that picture. Lets put the photo into perspective: the photo was taken from the rear of the boat; you are looking forward. The flash of the camera makes a shadow on the backside of the transducer.

There is a fairing block (tan colored) on top and a round transducer.

There is nothing square.

And FYI Birdy .... not only do I know what a strainer looks like, I've installed a mess of them .....

You prroposed the idea that the photo was taken from the SIDE of the boat??????? You might want to put some glasses on and look again.

A zinc located between the hull and "propsed" strainer?????? Have you ever seen a used zinc Birdy? How would you change that zinc???? I think you are loosing it Birdy.
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Old 10-15-2011, 06:31 AM
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thats the worst transducer installation ever !!! looks like an old 1kw furuno ducer - furuno made them in conjuction with groco in the late 80's. they stopped making them because the intake strainer got clogged with seawater if the ducer/strainer was not angled properly, leading many people to use the variable angle adjustable flexible wedge block shown in this photo. it has a sensor that receives hull "roll" angle as compared to the sea floor, and automatically adjusts down angle. the biggest problem was the issues created by lower water temps in norther latitudes that caused the strainer to completely ice over and made the sonar portion of the system fail. these were all thought to have been replaced under warranty years ago. if you contact grocco directly, they will authorize a replacement photo that will clarify exactly what you have been smoking.

im just pissed........ its saturday morning and no boating today
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Old 10-15-2011, 09:47 AM
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Could be from an early-80s Datamarine unit. I just took something quite similar out of a '79 Marine Trader. See if you can follow the wire on the inside - if it's not cut off, those units had an "RCA" plug on the end where the 'ducer connected to the depth display.
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Old 10-16-2011, 11:13 PM
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Originally Posted by Birdman View Post
That does NOT look to be ducer!! That is the raw water intake strainer for the motor or Genset. Your looking at it from the stern, looking forward. If you took the picture from the other side, you would see a sea strainer screen on it.
Originally Posted by chrisrack View Post
I don't know what you are looking at Birdy ..... I don't see anything square in that picture. Lets put the photo into perspective: the photo was taken from the rear of the boat; you are looking forward. The flash of the camera makes a shadow on the backside of the transducer.

There is a fairing block (tan colored) on top and a round transducer.

There is nothing square.

And FYI Birdy .... not only do I know what a strainer looks like, I've installed a mess of them .....

You prroposed the idea that the photo was taken from the SIDE of the boat??????? You might want to put some glasses on and look again.

A zinc located between the hull and "propsed" strainer?????? Have you ever seen a used zinc Birdy? How would you change that zinc???? I think you are loosing it Birdy.
1st, I did not say we are looking at it from the side, I said the STERN. The Stern is the back of the boat.

2nd, no, there is nothing "square" in it. There is nothing "square" on an intake strainer. The side of the strainer is triangular. The triangle in the pic is not a shodow, it's the acual unit (whatever it is).

2nd, what I'm looking at is what looks to be a main or genset inboard Intake Strainer made most likely by Buck Algonquin. In the image below, I have color coded it for you. The arrow shows the direction the photo was taken from. If you were to turn the strainer I added to the picture 90 degrees to the right, you would be looking at the back end of it which looks greenish(aka corroded brass) in the photo. The red triangle on the side of the strainer is the same red triangle on the side of the "object" in the photo. I put a hash mark on one side of the triangles in both images so you can compare/line them up. The blue line shows the location of what looks to be a corroded zinc running across the two mounting screw holes which is sometimes done for added zinc protection.

That's just my guess. A picture from the front side of this thing would GREATLY help us out. You would see the screen from the front of it, if in fact it is an intake strainer.

Seabob, where are you????
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Last edited by Birdman; 10-16-2011 at 11:24 PM.
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Old 10-17-2011, 10:40 AM
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Birdy -

OK ...... you are right.

Although I've never seen a 3x5 strainer on a trailered boat. And we already know that the "thing-ey" is a transducer (see title of thread). And it would awfully unusual for a single bronze strainer to become 2 different colors. But you are right.

Why let common sense and reading comprehension become a factor here.

The boat in the picture is most likely an 18 to 23ft based upon the relatively small axle seen in the photo and I only see 1 axle. Plus the trailer seems to be faily lightweight. So what exactly do you think that a 3x5 strainer would be used for on this sized boat? Maybe it has a 430 Cummins C series diesel? Or maybe this 20ft cc has a 12kw generator mounted under the deck?
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Old 10-17-2011, 11:51 AM
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=> 2 colors: 1) BRONZE strainer 2) ZINC anode on rear of strainer as is done often.

=> The 20' Seacraft CC in my next door neighbors driveway, on a single axel trailer, has a single 160hp Yanmar in it, with the exact Buck Algonquin sea strainer I pictured.

=> I've also seen these strainer used for livewells. Eel-grass in the back bays can be a killer around LI.

=> The title ASKS what it is, and assumes it may be a ducer. If I post a picture of a battery, but title the thread: "What motor is this?", does that make the battery, a motor?

=> Are you sure you comprehend, comprehension?

=> Lastly again for the 4th time, this is MY GUESS. Your guess is it's a "round transducer". Great, we'll find out for sure when/if we get a better picture, not a big deal. I see a long rectangular shaped unit, which is low in the front (1/8" thick), and high in the rear closest to us (2").

And PS, if it is in fact a transducer, he better remove it and install it properly.

Last edited by Birdman; 10-17-2011 at 12:13 PM.
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