[alberg30] Water Box for Dept Sounder

[Peter Hay]

Bill:  I bought my boat a few years ago and it has a similar setup.  The
water box is in the skins locker about 10" vertical inches above the cabin
sole.  I used water but found it only worked for a trip out and then it
quit.  This year I used common baby oil and again it worked first time--then
it quit.  I believe the problem is an air bubble forming just below the
transducer.  Last week I drilled two holes beside the transducer (it sits on
a water box that is about 4" wide at the top and 6" wide at the bottom) on
the same plane as the transducer.  I used a small syringe to force more oil
in one hole.  I was surprised to find that no oil came out the other hole so
my theory about air must be correct.  I did not completely fill the box, but
decided to try it.  It worked again.  I will now fill the remainder and take
a test run.  You will have figure out how to evacuate air without evacuating
oil.  That's my thinking anyway!!!
Best of luck
Peter Hay
phay at netcom.ca
Goderich, Ontario, Canada
----- Original Message -----
From: "Bill Newman" <bnewman at attcanada.ca>
To: "Alberg 30 Group" <alberg30 at egroups.com>
Sent: Tuesday, July 18, 2000 8:53 AM
Subject: [alberg30] Water Box for Dept Sounder


> I put out a question a couple of weeks ago about mounting a depth
> sounder transducer in the Alberg.  I can't remember who responded but
> the recommendations was for the water box method.  I did this this week
> with a President brand depth sounder using the transducer provided for
> installing in a hole in hull.  I made a water box from 3" PVC pipe and
> mounted it in the same spot with epoxy, where to old one was installed,
> in the forward section under the port settee.  I mounted the transducer
> in the pipe cap with two flanges.  The bottom of the transducer is about
> 11/2" from the hull in the water box.  I am not getting any proper deep
> water readings.  It seems to be OK in shallow water (i.e. 7 or 8 ft.).
> I have played with the sensitivity adjustment, the only adjustment, to
> no avail.  I used water in the box to see if it worked but would replace
> it with mineral oil before the cold weather.
>
> Does anyone have any ideas?  Should the transducer face be a certain
> distance from the hull surface inside the box?
>
> Bill Newman
> Marion Rose III #233
>
>
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