Shoot thru hull transducer on 22 cruiser

T

texasair

Member
I mounted my transducer inside the boat in the small recess where the bilge pump sets. I built a tape enclosure around it and poured in about an ounce or fiberglass resin to seal it in place and fill in voids around it. Because of the recess this spot does not have the balsa core and is solid fiberglass so the transducer shoots through OK. So far, I have only used it only one time in under 100 feet and it worked well. I used this method on my houseboat and was getting good readings down to 500 feet at Powell dam.

The gentleman that showed me this said that for it to work you must have solid fiberglass between the transducer and the water

I like not having to run the wire down the back of the boat and put screw holes into the transom.
 
I did the same thing and it worked great, until I just hauled out and painted the bottom! The new paint caused it to read all over the scale, now a month later it's beginning to get sensible, tho I don't trust it yet.
Roger
 
Could a high copper content cause reflectivity for the sonar beam, thus the problems. As it wore away, it could have gotten "better". Just sayin'..... :crook

Charlie
 
Good information for my project, but I need some advice. I decided to pull out the thru-hull fitting for my livewell pump and close the hole in the hull. Knowing there is no foam there (the recessed bilge are), do I simply use Marine Tex to eliminate the hole?
 
Marine Tex won't provide any strength. It is a fairing type of product that might fill small screw holes, but not the thru hull you intend to remove.

Proper repair will be to grind away some glass, and lay in new layers of glass mat or roving with epoxy resin and building up to match the hull thickness.
 
Matt Gurnsey":2pf1gljj said:
That's weird- bottom paint should have no effect on the transducer.
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I've had the bottom of the Tom Cat painted twice, with no observable effects on the transducer.

Warren
 
Thanks Matt G. I will refer to the West System for detailed information. In any case, as long as we are delving around the recessed area or mini bilge of the C-Dory, in my case a Venture 23, closing the hole leaves me with at least too options; 1) put a second or back-up bilge pump, and or 2) move my transducer from the transom to the bilge area, since the one in the derrier has given me problems. It came loose once and betar itself to death, and the replacement does not read well at speed. Any thought on this? Are transducer better as thru-hulls, or leave it be on the derrier?
 
texasair":ak9d17ur said:
I mounted my transducer inside the boat in the small recess where the bilge pump sets. I built a tape enclosure around it and poured in about an ounce or fiberglass resin to seal it in place and fill in voids around it. Because of the recess this spot does not have the balsa core and is solid fiberglass so the transducer shoots through OK. So far, I have only used it only one time in under 100 feet and it worked well. I used this method on my houseboat and was getting good readings down to 500 feet at Powell dam.

The gentleman that showed me this said that for it to work you must have solid fiberglass between the transducer and the water

I like not having to run the wire down the back of the boat and put screw holes into the transom.
Click to expand...


I have heard of glassing in a transom mounted transducer but instead installed an actual through hull transducer in the same place. Has worked much better for depth, now I can get a good read down to 1000+ which is essential for dropping shrimp pots up here. It still is a crap shoot whether they actually land were you drop them, but when you hit the mark it’s a bounty.
 
I'll think about that, but at 1000' + might have to contract BP or the likes (that's Godzilla domain)... Plus, in Panama Bay to get 1000' I would have to go 100 miles out :( . Never tried trapping anything... Should try that.
Got some beautiful yellow fin tuna and wahoo week before last, plus dorado, bonito, various jacks in the Pearl Island archipelago.
Any opinion on single bilge pump, vs dual in one of these boats?
 
I usually drop a string of three pots starting between 660 and 700 feet, drop them uphill spaced about 100ft apart on the line; the last pot goes off somewhere in the low 500s. My main line is 1000 feet long so the last pot goes over with 800 feet of line to the buoy, than a weight gets clipped on a 700feet. My main line is made up of 400 feet of sinking line attached to 600 feet of floating line. The floating line helps to prevent snags on the bottom, and the extra line to the buoy is there if I miss the drop zone. Best shrimping here is steep and deep, and often the slop drops down to 1200 or more feet. If you don’t judge your drop with the current the pots can easily drift away, don’t ask me how I know. So now I don’t take anything for granted, and stay with the buoy till I know it’s secure.

They grow big down deepIMG_2208.sized.jpg
 
Ok... Just ordered a crab / prawn trap through Amazon. See what I can get between 20' and 120'... I'm not going out to the Godzilla domain. There are places in Panama where you drop of thousands of feet in less than a mile, at the Pacific border between Panama and Costa Rica. Too far to trailer my Venture behind my H. Pilot.
 
B²":1hnzybw9 said:
omg

How do you handle and store all of the lines?
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Not hard, 5/16th line, two sets coiled in two Rubbermaid tubs, 2 A1 buoys, 6 pots stacked in the corner. It’s tight back there tell the pots go over, than its fishing time. My freezer is now about 1/3rd full with like 60 bags of shrimp (sick) so we only take out a single set now, last weekend of the season I will dedicated them all to top off the remaining space available between the garden vegetables, berries and fish.
 
Karl":273iwalq said:
Is that what's called a "jumbo" shrimp? Looks like what we call a "lobster"...
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Those are spot prawns and they're the best damn tasting shrimp you'll ever have. They do taste more like lobster than the typical shrimp you're used to from either the Gulf of Mexico or the farms in Vietnam.
 
I rarely eat shrimp, but I'll bet my Miss Kitty would know the difference!

She howls when sniffing the frozen Walmart asian ones I buy for her...bet she would like to attack one of yours alive and eat it raw. Seafood mouse...
 
The Alaska Department of Fish and Game classifies these tasty treats as Spot Shrimp, down South they are communally called Spot Prawns; same bug different name. The only real difference I know is the life cycle, the Alaska variant can take 8 or more years to fully mature while the Southern cousins take half as long.

Here's some more eye Candy:

IMG_2674.jpg

IMG_2745.jpg
 
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