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Transducer Signal Loss
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Wandering Sagebrush



Joined: 21 Jan 2005
Posts: 2783
City/Region: Northeast Oregon
State or Province: OR
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Constant Craving
Photos: Constant Craving
PostPosted: Thu Aug 18, 2011 6:07 pm    Post subject: Reply with quote

Tug wrote:
Went out fishing 5:30 AM, took me a hour to do 18 miles because of the heavy fog. The transducer was not working very good at all ,i kept losing the bottom,at all speeds. My next option is to lower the transducer,move it to the Starboard side and also make sure that the transducer is not in-line with the skeg. Tug


Tug, the transducer for my C80 is about a foot left of the centerline, and just a tad below the bottom. Try and determine where you have the cleanest flow of water. If there are bubbles in the area when you're going fast, that would not be a good location.

Good Luck!

Steve

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CaptainChris



Joined: 11 Jan 2010
Posts: 9
City/Region: Dallas
State or Province: TX
PostPosted: Thu Aug 18, 2011 6:58 pm    Post subject: Reply with quote

All boats, regardless of hull design, at speed, create turbulence. There simply is no "smooth" or clean flow of water. It doesn't exist...they all create a mess, but folks keep looking for it in the most dangerous sort of ways. A transom-mounted transducer "snugged" up to the transom on its bracket is exacerbated when "shoved" below the running surface in the "trough" is bound to create sounding issues. This is what we have been taught, so that's what we do. By moving your high speed transducer aftward from the boat transom and by elevating the face into the naturally rising slipstream of displaced water created by your boat, employs a corrective advantage toward improving a transducer sounding by reducing or eliminating transducer drag, spray and/or turbulence and those obnoxious rooster tails.
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Spike



Joined: 21 Oct 2006
Posts: 572
City/Region: Kent
State or Province: WA
C-Dory Year: 2007
C-Dory Model: 22 Cruiser
Vessel Name: Bootleg Hooch
Photos: Bootleg Hooch
PostPosted: Thu Aug 18, 2011 8:21 pm    Post subject: Reply with quote

I can't remember where I heard about it but it does work. Try putting some dish soap on the bottom of your transducer before you launch. It is not a cure all but I found that it does help for awhile
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Bootleg Hooch
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CaptainChris



Joined: 11 Jan 2010
Posts: 9
City/Region: Dallas
State or Province: TX
PostPosted: Fri Aug 19, 2011 5:33 pm    Post subject: Reply with quote

Spike wrote:
I can't remember where I heard about it but it does work. Try putting some dish soap on the bottom of your transducer before you launch. It is not a cure all but I found that it does help for awhile
Soaps and detergents are water surfactants and have a tendency to reduce the surface tension of water which causes it to "shed its skin" and spread out. Before there were very many rules at all, we used to wipe soap on the hulls of our hydros before a race. That was many years ago. It wouldn't last and when the speed began to decrease we knew that was the end of our racing advantage.
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Tug



Joined: 22 Jun 2007
Posts: 995
City/Region: Sault Ste. Marie
State or Province: ON
C-Dory Year: 1985
C-Dory Model: 22 Angler
Vessel Name: Drifter
Photos: Drifter
PostPosted: Thu Oct 06, 2011 8:50 am    Post subject: Reply with quote

Today i think i will reposition my mounting board and transducer to the Starboard side of the transom,is there an easy way to determine the angle of the transom, i am not reading my downrigger cannon balls so an adjustment shim may be necessary. If i remember correctly i used 5200 sealant to attach the mounting board, will the board come off the hull now. My biggest concern is about those long screws that came with the Airmar P66, they go right thru the mounting board and into the hull and because of this it is hard to seal them the way i would prefer to do. Any suggestions. Thanks Tug
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