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Thru-hull and transom mount placement

Old 07-14-2014, 08:08 PM
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Default Thru-hull and transom mount placement

Hello everyone-

I've read many threads regarding transducer placement and tried to relate them to my specific situation, but so far I haven't found any threads to answer my specific situation. If there are threads related to my specific situation, I apologize for the duplicate thread.

I'm getting read to install the GCV10 and I will be also installing a thru-hull transducer. My picture below shows a piece of tape where my H2O water wash-down pump intake is and the boat strakes. Also there is a piece of blue tape on the bottom of the hull which is where I am considering mounting the thru-hull transducer. There is another piece of blue tape on the transom, where I am thinking of mounting the GCV transducer.

I am wondering if anyone has any input on the following:

Thru-hull:

1) The location where I intend to mount the thru-hull and if it would be a good choice of location? I have chosen to mirror the water intake mounting location for the thru-hull. It can be mounted more aft but no farther forward.

Transom transducer:

1) The location where I am thinking of mounting the transom mount GCV transducer and if it may be too close to being inline where the thru-hull will go?

2) Would the GCV transducer be too close to the propellers?

I would prefer to mount the transom transducer on the starboard side since I already have my old transducer on that side. I used to have at transducer on the port side but patched the hole where the wire goes through the transom with fiberglass and gel coat and would prefer not to open up the hole again.

As a side note: Though the trailer roller looks to be in the way and would hit the transducer, I am assuming that the transducer bracket will hold the transducer away from the wheel and I will also be using a stern saver which will further hold the transducer away from the wheel. I haven't been able to test this assumption out since the GCV hasn't arrived yet.

Thanks for any help/suggestions.

http://www.thehulltruth.com/attachme...1&d=1405393183

http://www.thehulltruth.com/attachme...1&d=1405393183

http://www.thehulltruth.com/attachme...1&d=1405393183
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Old 07-15-2014, 07:44 AM
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Thru-hull:

1) The location where I intend to mount the thru-hull and if it would be a good choice of location? I have chosen to mirror the water intake mounting location for the thru-hull. It can be mounted more aft but no farther forward. Transducers should not be mounted behind water intakes or other items causing a disturbance ahead of the transducer.

Transom transducer:
1) The location where I am thinking of mounting the transom mount GCV transducer and if it may be too close to being inline where the thru-hull will go? Should work but I would call Garmin support and get feedback on interference between those two transducers if the transom mounted transducer will continue to be used after the thru hull is installed.

2) Would the GCV transducer be too close to the propellers? I believe that should work, and transducers need to be on the Starboard side to reduce prop wash.

I would prefer to mount the transom transducer on the starboard side since I already have my old transducer on that side. I used to have at transducer on the port side but patched the hole where the wire goes through the transom with fiberglass and gel coat and would prefer not to open up the hole again.


Jim
Old 07-15-2014, 08:11 AM
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Thanks jfwireless for the reply. I think I made my question about the thru-hull a little confusing based on your response. My H2O intake is mounted on the port side and I intend to mount the thru-hull on the starboard side where there will be nothing in front of it. Based on my picture of where I intend to mount the thru-hull should I mount it closer to the rear of the boat. Right now the proposed spot is about 3-4' from the back of the transom. I'm just wondering if I might risk picking up air that far forward and it should be closer to the transom?
Old 07-15-2014, 08:18 AM
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Yes the transducer should be back close to the transom, so it is always in the water. Get a tilted element to match the angle of your boat.

Jim
Old 07-16-2014, 08:45 AM
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I just completed a similar installation on a 22 Grady White with a transom mounted outboard. The mounting for the thru-hull tilted element ended up working best just about where you have the blue tape. Ended up being about in the center between the keel and the stringer.

The transom mount transducer for the SideVu/DownVu was located just outboard of where you currently have a TM. I put it here to start, using old holes and figured I could lower it later if needed.

I have only got to use the unit a couple of times in shallow water less than 20', but would say it works great and did not see any problems with the images. Hope to use it this weekend in 60'-80' and see how it performs then.

The only immediate problem is the slight rooster tail created by the gap between the hull and the transducer. I left some room to move it up so I can close the gap to hopefully eliminate this. Contacted Garmin about this and they also recommended moving it up.

Hope this helps.
Old 07-16-2014, 07:06 PM
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MJD- thanks for the reply. I'm installing on a 24' Grady with an I/O. On your transom mount transducer, are you getting a clear reading while moving faster than trolling speed? Can you still read the bottom? Thanks.,
Joe
Old 07-17-2014, 06:17 AM
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I have not really had a chance to use it at much more than trolling speed yet, but plan to move the transducer up a little this weekend and spend more time using the system.

I am sure others on here have more experience and can add more, but from what I understand the technology and transducer work best at slow speeds. Not sure at what speed you will start to lose the bottom.

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