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Location of Depth Transducer
ComputerJoe
#1 Posted : Friday, May 22, 2009 12:38:37 AM(UTC)
ComputerJoe

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When I bought ThunderBird I had every thru hull I did not have a purpose for welded shut, everyone. Now I find myself switching from a transom mount tranducer to a thru hull. As in everything in life there are trade offs. I would kind of like the transducer as far forward as possible to pick up that rock before it gets hit but the water too disturbed by bubbles up there to get a clear reading at any speed but full stop.

I'm looking to youse guys collective knowledge and expirence before I get an ulcer deciding where to punch a hole in my hull. My BigM has a skeg keel and the prior hole was under the steps up to the weatherdeck, about mid-ship on ThunderBird.
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fastjeff
#2 Posted : Friday, May 22, 2009 1:04:04 AM(UTC)
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Not sure why a transducer would not read at speed--unless it was poorly placed. My transom mounted transducer is impervious to boat speed, and it's a lot more turbulent back there!

I'd go with the transom mount, and here's why: Unless you're creeping, the bottom comes up too fast to stop, regardless of where the transducer is mounted. The biggest problem I have with them is barnacle growth, and it's far easier to keep 'em clean if they are located on the transom.

Finally, the thought of a thru hull getting wiped off by a log---with a giant hole in the hull resulting--is enough to dissuade me! Not only is a transom mount less vulnerable--only a fraction of an inch of it sticks down--it's easier to change should an oops! happen.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell

tr_guy79
#3 Posted : Friday, May 22, 2009 1:58:01 AM(UTC)
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I agree with Jeff.

A depth finder should never replace properly reading and following markers, and having a knowledge of the waters you are in. My boat has a thru (hole in the) hull transducer from the PO... No reason it shouldn't work, but the less holes in my hull the easier I rest at night.
"McKenna Renee"
1972 '32 FB Express. Twin 318 / Edelbrock 1409s
Chesapeake City Md (Upper Bay / C&D Canal)
jralbert
#4 Posted : Friday, May 22, 2009 2:47:56 AM(UTC)
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I'd put it where the mfr says it will give best results. I have two on the bottom: one nearly the size of my foot hanging from the hull, the other flat as a pancake. The flat one gives consistent readings, the one with the large profile will occasionally get weird, perhaps from trapping some seaweed - but it always comes back.

(Harrumph! This ain't a tip or trick thread. It should, I guess, be in the Electronics dept. Bah Humbug. Oooh, wait: we ain't got no stinkin Electronics section. Maybe we should - as opposed to an electrical department. Electronics would be for discussion of our gadgets such as nav gear, radios, radar, etc - HEY JOE. . . . . .)
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
ComputerJoe
#5 Posted : Friday, May 22, 2009 3:50:39 AM(UTC)
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jralbert wrote:
(Harrumph! This ain't a tip or trick thread. It should, I guess, be in the Electronics dept. Bah Humbug. Oooh, wait: wse ain't got no stinkin Electronics section. Maybe we should - as opposed to an electrical department. Electronics would be for discussion of our gadgets such as nav gear, radios, radar, etc - HEY JOE. . . . . .)


I did scratch my head a bit about where to post it.

Barnacles in the great lakes are no problem, cleaning zebra mussels off??? Hey I'm making it a DIVE boat, it gives me something to do while waiting around on the surface, and I trailer it anyway. Transom mounts worry me as the divers will be hanging out there and could potientially damage the cable if not the dam plastic tranducers they give you for back there. I have one but just got done ordering a bronze thru hull for this reason and to do away with the screw holes needed to hold the cable in place. I guess I'm trying to figure out how far back most tranducers are mounted.

I am immiently aware of my local condition and my knowledge tells me where to go slow and watch out for rocks, not where everyone of them buggers are. Thunder Bay earned it's reputation as the "Shipwreck Alley" of the Great Lakes for a reason.
Gypsy Girl
#6 Posted : Wednesday, June 03, 2009 1:21:11 AM(UTC)
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I pulled my boat to find several unused thru hulls and transducers as well.
I waited and spoke with 3 different welders ,none of which showed up to do the work(3 weeks)..
I chose to remove the rotten wood fairing block from the bronze ducer in use and fair it back with 2 part fairing compound which gives a much decreased profile and filled the 2 screw holes in the process.
Just remember to isolate the ducer from the hull as well as the ducer shaft.
Lot's of 5200 and a gasket.
As far as the other holes , I am meeting a welder(imported from miles away) to repair the rudder tubes on thursday and have already cut round pieces of the same guage aluminum to be welded in the other holes if he is able.


Warning....Do NOT come to this part of Va. expecting the welders to get off thier bottoms to fix yours...
ComputerJoe
#7 Posted : Wednesday, June 03, 2009 3:45:42 AM(UTC)
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Gypsy Girl,

Be very, very sure you have a competant welder who is using the same alu as your hull!!!

You can find the number elsewhere on this site but it is a 50xx something aluminum. You can get an aluminum weld that looks good but is not truely bonded to your hull.

I inquired around and found a welder that was a certified marine welder (he worked on USCG vessels below waterline) or an equivalent certification like gas pipelines or such. You are placing your life in the hands that will weld you hull. Billy-Bobs quick weld service might not the right man for the job.

AlumiJim
#8 Posted : Wednesday, June 03, 2009 8:24:29 AM(UTC)
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It's 5086 plate. The attached is from an exchange back when the old site was still up:

Try www.mcmaster.com. Their Part Number: 5865T42 is a plate of 5086 3/16" thick and 12" X 24".

It is around $40. They also have 1/4" plate if you need it.

slow doug


The following is today's current pricing (June 3, 2009) from McMaster/Carr:

Part Number: 5865T42 $27.79 Each
Material: Super-Corrosion-Resistant Aluminum (Alloy 5086)

Finish/Coating: Unpolished (Mill)
Edge Type: Square
Tolerance: Standard
Thickness: .19"
Thickness Tolerance: ±.009"
Length: 24"
Length Tolerance: ±.1/16"
Width: 12"


JIM
Alexandria, VA
1989 32' Sedan
'Gammelby'
Friendship, MD
Preldor
#9 Posted : Thursday, June 04, 2009 1:18:07 PM(UTC)
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I know a certified and highly competent welding company which does work in the Md, DC, VA areas. They have extensive experience with aluminum hulls doing both repairs and fabrication.

Preldor

preldor@comcast.net
old32
#10 Posted : Friday, June 05, 2009 1:47:34 PM(UTC)
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has anyone mounted a transom mount transducer with there boat in the water?


tim

72 32' express
"http://www.theboaters.com/boats/Powerboat_Express_Cruiser_marinette_1972_anticipation"
fastjeff
#11 Posted : Friday, June 05, 2009 11:31:44 PM(UTC)
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..."has anyone mounted a transom mount transducer with there boat in the water?"

Not at this time of the year! Just being serious..... It could be done with a pneumatic drill (for obvious reasons) and without much difficulty (but with lots of splashed water).

Jeff

"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell

dougrose
#12 Posted : Saturday, June 06, 2009 12:50:59 AM(UTC)
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I have often thought of mounting stuff under the swim platform, or using the tabs on the hull that are already there for the swim platform, to avoid drilling those holes in the hull. I have a transom transducer with speed wheel transom-mounted on my whaler fishing boat, and I like the location - accessible, adjustable, and largely immune to damage. But the mounting holes don't go all the way through like they would on a metal boat.

In particular, I am thinking of mounting lights below the swim platform, where they will be immersed at anchor, but clear of the water flow on plane. I wonder if anyone has tried this.


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
dependo
#13 Posted : Saturday, June 06, 2009 1:14:41 AM(UTC)
dependo

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I have lights mounted under my swim platform. Work great look cool. Used Lowes 12v pond lights. 50 watt I think. I,ve had them 2 years no problem.They have to be set to where they are under water when on to keep them cool. they are out of the water on plane.
I like the idea of transducer attached to platform. Wayne
1973 express FB 32ft
twin 318
"Southern Lady"
Chattanooga
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