Transducer mount:Transom or glassed in??

Transducer mount:Transom or glassed in??

Post by BKelle » Sat, 25 Nov 2000 11:46:04


Greetings: Just bought a new 30' fiberglass cruiser and am going to be
mounting a GPS/sonar unit on the flybridge. In my old aluminum boats I used
to just mount the transducer on the transom and never had any probs. Am not
sure about how to mount it this time. Should I glass it in in the bilge area
or hang it on the transom? Have never done the glassed in route b4 and
wonder if this is a do-it-yourself type deal or better left to the pros. Any
help greatly appreciated!
 
 
 

Transducer mount:Transom or glassed in??

Post by macleanp » Sat, 25 Nov 2000 04:00:00

I'm no expert but the preferred method seems to be thru-hull. I mean like a
hole through the hull! Yea I know-pretty scary. I double nutted mine and
safety wired it too. There is some concern that shooting through the hull
will degrade your signal. Transom mounts are not recommended for inboards
although some people have had luck with them. I suppose it depends on the
prop placement,hull form,etc. I/Os could use transom mounts but you want to
make sure you get in clean water. Some of the avid fisherman like Harry
would probably know best.

Doug


Quote:
> Greetings: Just bought a new 30' fiberglass cruiser and am going to be
> mounting a GPS/sonar unit on the flybridge. In my old aluminum boats I
used
> to just mount the transducer on the transom and never had any probs. Am
not
> sure about how to mount it this time. Should I glass it in in the bilge
area
> or hang it on the transom? Have never done the glassed in route b4 and
> wonder if this is a do-it-yourself type deal or better left to the pros.
Any
> help greatly appreciated!


 
 
 

Transducer mount:Transom or glassed in??

Post by macleanp » Sat, 25 Nov 2000 04:00:00

When I was referring to signal loss-it was only in reference to showing
fish-some claim the thru-hulls don't work as well for spotting fish. If I
remember right the important part in installing the shoot through the hull
type is making sure that there is nothing between the transducer and the
water but fiberglass and epoxy-NO air spaces. My through the hole in the
hull transducer only sticks out about a half inch although some protrude
more. Heard about another method where they epoxy some kind of box inside
the hull with the transducer attached then fill the box with mineral
oil-unfortunately that's all I remember. Hey I've got a great idea ----ask
the mfg.

Doug


Quote:
> Greetings: Just bought a new 30' fiberglass cruiser and am going to be
> mounting a GPS/sonar unit on the flybridge. In my old aluminum boats I
used
> to just mount the transducer on the transom and never had any probs. Am
not
> sure about how to mount it this time. Should I glass it in in the bilge
area
> or hang it on the transom? Have never done the glassed in route b4 and
> wonder if this is a do-it-yourself type deal or better left to the pros.
Any
> help greatly appreciated!


 
 
 

Transducer mount:Transom or glassed in??

Post by Steven Dubnof » Sat, 25 Nov 2000 04:00:00



Quote:
>Greetings: Just bought a new 30' fiberglass cruiser and am going to be
>mounting a GPS/sonar unit on the flybridge. In my old aluminum boats I used
>to just mount the transducer on the transom and never had any probs. Am not
>sure about how to mount it this time. Should I glass it in in the bilge area
>or hang it on the transom? Have never done the glassed in route b4 and
>wonder if this is a do-it-yourself type deal or better left to the pros. Any
>help greatly appreciated!

My transducer is simply stuck to the inside of the hull with a gob of
silicon sealant.  The big advantage of this method is that if you put
it in a bad spot, you can just pry it off and try again.  

Give it a try, you have nothing to loose.  You can always drill a hole
through your hull if you don't like it.

Best,

Steve

----------------------------------------------------------------

Circle Systems              We make your data instantly usable.
Download Stat/Transfer from http://www.stattransfer.com
1001 Fourth Avenue, #3200   (206) 682-3783
Seattle, WA 98154           Fax (206) 328-4788

 
 
 

Transducer mount:Transom or glassed in??

Post by Jim Donohu » Sat, 25 Nov 2000 04:00:00

It is quite clear that, for the best signal, you mount through the hull.
For simple depth sounding you lose a little range by mounting inside the
hull but it has got to take the edge off fish finding.  Under any
circumstances inside hull mounting requires solid fibreglass without coring.
Properly set up such transducers are flush with the hull.

This is not real hard or anything.  In fact the transducer can be removed in
the water if you simply substitute the provided plug.

I don't think transom mounts can be expected to work with inboard engines.

Jim

Quote:
> When I was referring to signal loss-it was only in reference to showing
> fish-some claim the thru-hulls don't work as well for spotting fish. If I
> remember right the important part in installing the shoot through the hull
> type is making sure that there is nothing between the transducer and the
> water but fiberglass and epoxy-NO air spaces. My through the hole in the
> hull transducer only sticks out about a half inch although some protrude
> more. Heard about another method where they epoxy some kind of box inside
> the hull with the transducer attached then fill the box with mineral
> oil-unfortunately that's all I remember. Hey I've got a great idea ----ask
> the mfg.

> Doug



> > Greetings: Just bought a new 30' fiberglass cruiser and am going to be
> > mounting a GPS/sonar unit on the flybridge. In my old aluminum boats I
> used
> > to just mount the transducer on the transom and never had any probs. Am
> not
> > sure about how to mount it this time. Should I glass it in in the bilge
> area
> > or hang it on the transom? Have never done the glassed in route b4 and
> > wonder if this is a do-it-yourself type deal or better left to the pros.
> Any
> > help greatly appreciated!

 
 
 

Transducer mount:Transom or glassed in??

Post by macleanp » Sat, 25 Nov 2000 04:00:00

Good point-forgot about cored hulls.

Doug


Quote:
> It is quite clear that, for the best signal, you mount through the hull.
> For simple depth sounding you lose a little range by mounting inside the
> hull but it has got to take the edge off fish finding.  Under any
> circumstances inside hull mounting requires solid fibreglass without
coring.
> Properly set up such transducers are flush with the hull.

> This is not real hard or anything.  In fact the transducer can be removed
in
> the water if you simply substitute the provided plug.

> I don't think transom mounts can be expected to work with inboard engines.

> Jim


> > When I was referring to signal loss-it was only in reference to showing
> > fish-some claim the thru-hulls don't work as well for spotting fish. If
I
> > remember right the important part in installing the shoot through the
hull
> > type is making sure that there is nothing between the transducer and the
> > water but fiberglass and epoxy-NO air spaces. My through the hole in the
> > hull transducer only sticks out about a half inch although some protrude
> > more. Heard about another method where they epoxy some kind of box
inside
> > the hull with the transducer attached then fill the box with mineral
> > oil-unfortunately that's all I remember. Hey I've got a great
idea ----ask
> > the mfg.

> > Doug



> > > Greetings: Just bought a new 30' fiberglass cruiser and am going to be
> > > mounting a GPS/sonar unit on the flybridge. In my old aluminum boats I
> > used
> > > to just mount the transducer on the transom and never had any probs.
Am
> > not
> > > sure about how to mount it this time. Should I glass it in in the
bilge
> > area
> > > or hang it on the transom? Have never done the glassed in route b4 and
> > > wonder if this is a do-it-yourself type deal or better left to the
pros.
> > Any
> > > help greatly appreciated!

 
 
 

Transducer mount:Transom or glassed in??

Post by DFH » Sat, 25 Nov 2000 04:00:00

Hi Folks!

How would you do it for an aluminum hull!  Would silicon still work!

Thanks in Advance,

Dennis, WI


Quote:


> >Greetings: Just bought a new 30' fiberglass cruiser and am going to be
> >mounting a GPS/sonar unit on the flybridge. In my old aluminum boats I
used
> >to just mount the transducer on the transom and never had any probs. Am
not
> >sure about how to mount it this time. Should I glass it in in the bilge
area
> >or hang it on the transom? Have never done the glassed in route b4 and
> >wonder if this is a do-it-yourself type deal or better left to the pros.
Any
> >help greatly appreciated!

> My transducer is simply stuck to the inside of the hull with a gob of
> silicon sealant.  The big advantage of this method is that if you put
> it in a bad spot, you can just pry it off and try again.

> Give it a try, you have nothing to loose.  You can always drill a hole
> through your hull if you don't like it.

> Best,

> Steve

> ----------------------------------------------------------------

> Circle Systems              We make your data instantly usable.
> Download Stat/Transfer from http://www.stattransfer.com
> 1001 Fourth Avenue, #3200   (206) 682-3783
> Seattle, WA 98154           Fax (206) 328-4788

 
 
 

Transducer mount:Transom or glassed in??

Post by Waterlo » Sun, 26 Nov 2000 06:18:47

Quote:
>>Some of the avid fisherman like Harry

would probably know best.<< -- Doug

That's not exactly what people mean when they accuse him of trolling.

 
 
 

Transducer mount:Transom or glassed in??

Post by Lloyd Sumpte » Sun, 26 Nov 2000 09:10:52

   ALL the sounders I've used were/are "glassed-in" (actually epoxied to
the inside of the outer hull). Apart from not wanting to drill a hole in
your hull, another disadvantage of the "thru-hull" design is that it
sticks out and is vulnerable - you have to watch it to make sure lifting
straps, trailer bunks or rollers, etc. don't hit it. And I've never had
problems with the performance - the lowly Humminbird fishfinder in
Stinky even measured when on a plane!
   The "Glassing in" is pretty easy - lots of epoxy. Make a small box
around the area, MAKE SURE the transducer is pressed against the hull,
and pour in some epoxy. DOesn't have to be particularly strong.

Lloyd Sumpter
"Far Cove" Catalina 36

Quote:

> I'm no expert but the preferred method seems to be thru-hull. I mean like a
> hole through the hull! Yea I know-pretty scary. I double nutted mine and
> safety wired it too. There is some concern that shooting through the hull
> will degrade your signal. Transom mounts are not recommended for inboards
> although some people have had luck with them. I suppose it depends on the
> prop placement,hull form,etc. I/Os could use transom mounts but you want to
> make sure you get in clean water. Some of the avid fisherman like Harry
> would probably know best.

> Doug



> > Greetings: Just bought a new 30' fiberglass cruiser and am going to be
> > mounting a GPS/sonar unit on the flybridge. In my old aluminum boats I
> used
> > to just mount the transducer on the transom and never had any probs. Am
> not
> > sure about how to mount it this time. Should I glass it in in the bilge
> area
> > or hang it on the transom? Have never done the glassed in route b4 and
> > wonder if this is a do-it-yourself type deal or better left to the pros.
> Any
> > help greatly appreciated!

 
 
 

Transducer mount:Transom or glassed in??

Post by Jim Thompso » Sun, 26 Nov 2000 04:00:00

Try http://jimthompson.net/boating/Sounders.htm
-----
Jim Thompson


Quote:
> Greetings: Just bought a new 30' fiberglass cruiser and am going to be
> mounting a GPS/sonar unit on the flybridge. In my old aluminum boats I
used
> to just mount the transducer on the transom and never had any probs. Am
not
> sure about how to mount it this time. Should I glass it in in the bilge
area
> or hang it on the transom? Have never done the glassed in route b4 and
> wonder if this is a do-it-yourself type deal or better left to the pros.
Any
> help greatly appreciated!

 
 
 

Transducer mount:Transom or glassed in??

Post by RBSte » Mon, 27 Nov 2000 10:40:03

Quote:
>Am not
>sure about how to mount it this time. Should I glass it in in the bilge area
>or hang it on the transom?

I vote for the transom mount.  I was unhappy with the performance of a factory
expoxied-to-hull unit on my bass boat, moved it to the transom, and wow, what a
difference!  I was missing fish and structure, particularly when on plane.

I also have a 35' twin inboard with a transom mount unit, and I am satisfied
with that unit as well.

Measure carefully and make sure you stay out of the prop wash.  If it's a twin,
mount the transducer in the center of the transom.  Use lots of
below-the-waterline sealant on all the***holes.

Regardless of which method you choose, finding the right spot in the hull or on
the transom is critical.

-- Rich Stern