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Skiporkins
Joined: 04 May 2022
Posts: 7
City/Region: Juneau
State or Province: AK
C-Dory Year: 1994
C-Dory Model: 18-8 Toland
Vessel Name: Becky
Photos: Becky
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 Posted: Fri Sep 30, 2022 9:23 pm Post subject: shoot thru hull transducer |
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I am looking to install a shoot thru hull transducer on my toland 18.8. I think I’ve got a good idea of what is required but I would like to confirm my hull construction before moving forward. Can anyone help me find out if I’ve got a balsa, foam or the least likely, solid glass hull on the bottom of this boat? Any help or any pointers on where to look this info up would be amazing. Thanks in advance.
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Nathan and Niki Carey
Becky Toland 18-8
Juneau, AK |
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thataway
Joined: 02 Nov 2003
Posts: 20803
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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| Posted: Sat Oct 01, 2022 11:57 am Post subject: |
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The answer is in the archives.
| Quote: | | The deck and bottom contain encapsulated core. |
I would drill a pilot hole before taking the area needed for the transducer. Often it is wise to put the transducer in a baggie of water in the area where core was removed to see how well it transmits.
Conventional wisdom would build the inner skin back to the same thickness as originally over the core, (on the bottom and up the beveled sides.).
Although some say to use epoxy to give a conductive media, I prefer to make a plywood box covered inside and outside with epoxy and glass, then fill the box (which has a lid with a threaded filler tube and plug with mineral oil. Another option is to use silicone.
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Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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Leo Smith
Joined: 02 Nov 2003
Posts: 193
City/Region: West Seattle
State or Province: WA
Photos: Leo
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| Posted: Sun Oct 02, 2022 8:44 pm Post subject: |
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| I owned a Toland 18.8 years ago. My understanding is that the hull has a balsa core. My transducer was mounted on the stern. |
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Skiporkins
Joined: 04 May 2022
Posts: 7
City/Region: Juneau
State or Province: AK
C-Dory Year: 1994
C-Dory Model: 18-8 Toland
Vessel Name: Becky
Photos: Becky
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| Posted: Mon Oct 03, 2022 3:05 am Post subject: Thanks guys! |
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| I appreciate the info and the tips. I like the mineral oil idea. I’m going to try one more adjustment with my skimmer but I’ve been fighting with consistent readings and I seem to lose my depth just when I need it the most. |
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journey on
Joined: 03 Mar 2005
Posts: 3595
City/Region: Valley Centre
State or Province: CA
C-Dory Year: 2005
C-Dory Model: 25 Cruiser
Vessel Name: journey on
Photos: Journey On
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| Posted: Tue Oct 04, 2022 1:30 pm Post subject: |
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Journey On had had 2-3 different transducers off the stern. Every one has worked well, fast or slow. So, why is your transducer giving trouble? Certainly I don't know, but could it be that the transducer is not mounted rigidly to the stern? I used a piece of starboard attached to the hull and hung the transducer(s) from that.
As others with a C-Dory, I've had sailboats and those had a through hull transducer and I feel it would be a major hole in the hull to install one. Also, your selection of transducers is limited.
Bob does give a good method of using a through hull without drilling.
Boris |
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