"JG" wrote in
:

Thanks for the great info... next time. I didn't actually set it "in
stone" until I tried it. I tried to get it as center line as possible,
but tried to avoid right over the keel.


To find the best spot for the transducer to be epoxied into any hull,
simply put WATER inside the hull deep enough to submerge the transducer.
This will also test to see if you have a crappy cored hull that won't
couple the pings. Fresh water is fine, just deep enough to submerge the
pinger surface of the transducer. Now you can move the transducer around
in the water to find the spot that gives you the best pictures of the
bottom around that keel. Once you find the spot, pump it dry and dry it
good then epoxy it in place....

On Sat, 07 May 2005 19:42:06 -0400, Larry W4CSC
wrote:

Red Cloud© wrote in
:

The instructions for my $80 fishfinder, which I use as a backup for my
"real" depth sounder, says emphatically not to use a glob of silicone
glue to mount the transducer inside the hull.

Any soft glue, like your bathtub caulk, will ABSORB the ping from the
transducer. So, we use epoxy, which is very hard and very conductive to
the ping into the hull for maximum transmission of the sound.


I've successfully used Lifecaulk, or similar soft caulking compound,
although some manufacturers recommend epoxy. Epoxy seems to be too
permanent for my liking.

Using a soft sealant may reduce the usable range somewhat, but I am
more interested in how shallow it is, not how deep...

A suggestion _before_ you glue down the transducer: put the transducer
in a plastic bag with some water, and hold it against the hull in
various locations to find the location that gives the best
performance.


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca

That's an interesting way to do it. That would have worked on my boat, but I
just guessed and was right on as best as I could tell.

--
"j" ganz @@
www.sailnow.com

"Larry W4CSC" wrote in message
...
"JG" wrote in
:

Thanks for the great info... next time. I didn't actually set it "in
stone" until I tried it. I tried to get it as center line as possible,
but tried to avoid right over the keel.


To find the best spot for the transducer to be epoxied into any hull,
simply put WATER inside the hull deep enough to submerge the transducer.
This will also test to see if you have a crappy cored hull that won't
couple the pings. Fresh water is fine, just deep enough to submerge the
pinger surface of the transducer. Now you can move the transducer around
in the water to find the spot that gives you the best pictures of the
bottom around that keel. Once you find the spot, pump it dry and dry it
good then epoxy it in place....

JG wrote:
That's an interesting way to do it. That would have worked on my boat, but I
just guessed and was right on as best as I could tell.

I used a soft putty of some sort for testing locations. Putty will
not transmit is good as epoxy, so if it works for that it should be fine.

I wish I could remember exactly what it was, but at the time, we joked
so much about using peanut butter that that's all I can remember now.

How about just using peanut butter? g

--
"j" ganz @@
www.sailnow.com

"Jeff" wrote in message
...
JG wrote:
That's an interesting way to do it. That would have worked on my boat,
but I just guessed and was right on as best as I could tell.

I used a soft putty of some sort for testing locations. Putty will not
transmit is good as epoxy, so if it works for that it should be fine.

I wish I could remember exactly what it was, but at the time, we joked so
much about using peanut butter that that's all I can remember now.

"JG" wrote in
:

How about just using peanut butter? g



If you didn't have roaches in the bilge before the test, I'm sure you'll
have them in the bilge a week AFTER!

"Larry W4CSC" wrote in message
...
"JG" wrote in
:

How about just using peanut butter? g

Rats love peanut butter to death.

Is this a good thing or a bad thing?

--
"j" ganz @@
www.sailnow.com

"Garuda" wrote in message
...

"Larry W4CSC" wrote in message
...
"JG" wrote in
:

How about just using peanut butter? g

Rats love peanut butter to death.

JG wrote:
How about just using peanut butter? g

Ah! Now I remember! It was a baggy with a bit of mineral oil in it.
Put the transducer in the bag, "sealing" the top just by grabbing
the sensor, and just placing it wherever you want to test. The boat
stays clean, the sensor can be wiped off easily, so its pretty painless.

Glad I could help... g

--
"j" ganz @@
www.sailnow.com

"Jeff" wrote in message
...
JG wrote:
How about just using peanut butter? g

Ah! Now I remember! It was a baggy with a bit of mineral oil in it. Put
the transducer in the bag, "sealing" the top just by grabbing the sensor,
and just placing it wherever you want to test. The boat stays clean, the
sensor can be wiped off easily, so its pretty painless.