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Author Topic:   Installing a Fishfinder transducer
NewWhalerGuy posted 09-29-2001 09:17 PM ET (US)   Profile for NewWhalerGuy   Send Email to NewWhalerGuy  
Hi.. anyone got tips for installation of a transom-mount tranducer. (Lowrance X-15 dual freq skimmer on a 17 Standard).. looking for general tips, warnings, ideas etc. (Hates drilling holes in hulls especiall transoms)
jimh posted 09-29-2001 11:01 PM ET (US)     Profile for jimh  Send Email to jimh
whalerron posted 09-29-2001 11:40 PM ET (US)     Profile for whalerron  Send Email to whalerron     
I hate drilling holes in my boat and this is especially true for the transom in spots under the waterline. It seems with transducers that there is no standard for the mounts and that every manufacturer does it differently. With these thoughts in mind, I still only want to drill the holes one time regardless of whose depthfinder I am using. I have changed units 3 times now but I have only drilled holes once. I used the idea of mounting a small piece of StarBoard to the transom. Once that is secure, you can mount your transducer to that. If you buy a new unit, you can redrill the starboard while leaving the transom untouched.

I have seen some installations where a long piece of starboard is used. It is long enough that it sticks out of the water about 6 inches and the mounting screws are all into the transom above the water line while the transducer is mounted to the starboard below the waterline. Starboard is pretty flexible and I am not too sure how well this "long" piece works.

Kim posted 09-30-2001 07:50 PM ET (US)     Profile for Kim  Send Email to Kim     
any one want to see my thru hull pics. on my montauk17
jimh is not intrested. but some of you that want the most of your sounder ? this is the way to go.
Dick posted 09-30-2001 08:05 PM ET (US)     Profile for Dick  Send Email to Dick     
I'm allways interested in new ideas, send me a pic.
Dick posted 10-01-2001 10:18 AM ET (US)     Profile for Dick  Send Email to Dick     
Thanks for the pictures. That is a very nice installation. How about sharing some of the installation details.
smo posted 10-01-2001 12:23 PM ET (US)     Profile for smo  Send Email to smo     
If you want to avoid holes, you can mount a piece of "Starboar" with just 5200 adhesive and screw the transducer to that. I have pictures on my webpage at:
whalerron posted 10-01-2001 10:57 PM ET (US)     Profile for whalerron  Send Email to whalerron     
How long has that piece of Starboard been glued to your boat? I was under the impression that nothing would stick to Starboard and so I am surprised that you were able to glue a piece of it in place.

- ron

jimh posted 10-02-2001 12:10 AM ET (US)     Profile for jimh  Send Email to jimh     
Kim writes about a picture of his transducer installation:

"jimh is not intrested"

Huh? I think I am being misquoted!

Kim posted 10-02-2001 08:38 AM ET (US)     Profile for Kim  Send Email to Kim     
jimh I sent you a e/m months ago asking you if you would like to see the pics. with no responce I thought you were not intrested. sorry I will send them to you have others in film pictures but have no way to scan them up they are more deatailed in the how to do . going to get rid of this stupid web tv SOON then I will be able to send pics. viva e/m sorry for the spelling (s/p)
smo posted 10-02-2001 01:36 PM ET (US)     Profile for smo  Send Email to smo     
The starboard alone won't stick to the 5200 without a mechanical bond. You get the mechanical bond two ways;

First you route dovetail grooves on the back of the starboard and make certain they are completely filled with 5200.

second, you slather the entire back of the board with additional 5200 and bed it to the transom with small spacers at the corners so as not to squeeze out all the goop. Toothpicks work fine.

I've done several boats this way with 2 of them going on 10 plus years without a failure of the bond.

Without the grooves, the sealer will not stick alone. The reverse angle of the dovetail and the sealer filled groove is what makes the bond work.

lhg posted 10-02-2001 02:24 PM ET (US)     Profile for lhg    
Getting back to the original question, the Lowrance large sized "skimmer" transducer is a real pain (impossible!) to install so that it doesn't kick up a huge amount of backsplash and spray. I have been a Lowrance fan for years, and still am, but absolutely HATE that particular transducer, having been uable to install it properly on both of my Whalers. Finally, I just gave up, and removed them, substituting instead their EASY to install little 20 degree
skimmer (best design on the market if you ask me) and a separate block style 50khz transducer flush with the bottom for deep water readings (over 500ft) while trolling.

NWG, I'll be amazed if you can that thing to run with a smooth flow under it. Let us know how you do!

Regarding transducer screw holes in the transom, I just don't see the big deal about it. There is previous discussion on easy ways to plug & gelcoat these, an hours work at best. It seems with the rapid advances in electronics, this is a fact of life. I have been doing this for years, and I have yet to have any of the repairs fail or let water in the transom plywood.

simonmeridew posted 10-02-2001 07:50 PM ET (US)     Profile for simonmeridew  Send Email to simonmeridew     
When I was mounting my Lowrance skimmer transducer this summer to my Montauk I thought about using a plastic "board" of some kind, either the "starboard" or Cabela's sells a piece of similar material specifically for transducer mounting. I took a straightedge to the transom and determined there was not a flat spot anywhere on the transom to mount the "board" to. There are curves in all dimensions. Plane geometry says a plane(the Starboard) intersects a curved surface(the transom) at only one point, which I thought would not be a very stable or strong arrangement.
I drilled 2 holes and mounted the transducer to the transom and was done with it. Why make things more complicated than they have to be, so forget the Starboard, I thought. Just my opinion.
Guts posted 02-16-2003 01:55 AM ET (US)     Profile for Guts  Send Email to Guts     
o here is one more asking about tranducer mounting.

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