Re: Depth finder info. needed

Case Turner

Drill a hole in the bottom. Use a they hull transducer some sikaflex or boat life adhesive and be done with it. No weird boxes, oil, water, witches concoctions to deal with. No interference, no fuss.


Sent from not here

On May 15, 2020, at 9:39 PM, Gerard Mittelstaedt <MITTEL48@...> wrote:

My sister had a large ferro cement hulled staysail schooner (well, large to my eyes)
It had a sonar which was mounted in a tube.  The sonar head could be lowered down
through the tube to look forward and positioned at various angles.
Much of the time it was raised above the bottom of the tube - which was flush to the
bottom of the boat.  This was good as one time the boat hit one of those huge logs which
float under the water and we could hear it rolling as the long keel proceeded over it
(no damage to the ferro cement keel) and since the sonar head was retracted
into the tube (not protruding down) it was not damaged. 
  One good use was coming in to a harbor/bay down an unmarked channel. 
The sonar showed the deep water and we had an easy go of it.
  Also, particularly when anchored down it was interesting seeing some rather
large fish below... and being impatient when none seemed to care at all for our bait.

This was in the San Juan Islands and also into Nanaimo and on to Princess Louisa

Gerard Mittelstaedt
sadly now in south Texas
not in the glorious NW

On Fri, May 15, 2020 at 5:41 PM Joe Novello <joenovello3@...> wrote:

On Fri, May 15, 2020 at 3:03 PM John Kohnen <jkohnen@...> wrote:
I'd been told that you should never run a depthfinder with the
transducer out of the water, because they don't like that and might stop
working in protest, but the guy in the Hawkeye video doesn't seem the
least bit concerned. <shrug> The baggy full of water trick looks like a
good way to test different locations in the boat, if it's fiberglass or
aluminum, or even to see if the transducer will work through a thin
plywood bottom.

With the low water in the local Mudhole this year maybe I should add a
depthfinder to Tuffy's equipment before putting her in the water. <g>

On 5/15/2020 7:31 AM, john a wrote:
> Just a couple of notes to add to John's comments.  My experience with
> water boxes is with fiberglass hulls, including bigger boats with
> substantial hull thickness.
> I have never had a problem with a water box mounted transducer except
> with one of those cheap sounders with the small round dial.  A quality
> 'fish finder' type works fine and is good for the depths we normally run
> in around here.  Depth range should not be an issue, but if you want
> 60-100 fathom range you need to pay attention to the transducer power
> output and frequency.
> A good water box can be made from a plastic pipe fitting with a screw
> cap.  What ever you use be sure to have a way to get the water box full
> and vent out all the air so it can't get bubbles when the boat moves about.
> John's method sounds fine and if you are concerned about strength
> laminate in some layers of fiberglass cloth in your 'epoxy plug'.  Just
> be sure to fully saturate the cloth.

John <jkohnen@...>
The man who is always waving the flag usually waives what it stands for.
(Laurence J. Peter)

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Joe Novello

Gerard Mittelstaedt  -- mittel48@...
McAllen, Texas

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