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Mike...
Joined: 13 Dec 2008
Posts: 470
State or Province: VA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Photos: Accelerando
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 Posted: Wed Oct 27, 2010 1:06 pm Post subject: TomCat transducer: Finding the Sweet-spot |
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Hello to all.
I am going with a thru-hull transducer (not a shoot-thru), and I seem to remember there is a some place in one (or both?) bilges that is solid glass.
Would one of you TomCat owners please point me in the right direction?
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mike |
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Captains Cat
Joined: 03 Nov 2003
Posts: 7313
City/Region: Cod Creek>Potomac River>Chesapeake Bay
State or Province: VA
C-Dory Year: 2005
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Vessel Name: Captain's Choice II
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| Posted: Wed Oct 27, 2010 1:25 pm Post subject: |
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Mike Starboard Sponson at the stern, near the bilge pump. If you can get your head in there, you can see it. It's an indentation.
charlie
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CHARLIE and PENNY CBRAT #100
Captain's Cat II 2005 22 Cruiser
Thataway (2006 TC255 - Sold Aug 2013)
Captain's Cat (2006 TC255 - Sold January 2012)
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Captain's Choice (1994 CD 22 Cruiser- Sold Jun 2007)
Potomac River/Chesapeake Bay
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matt_unique
Joined: 27 Feb 2007
Posts: 1881
City/Region: Boston
State or Province: MA
C-Dory Year: 2007
C-Dory Model: 255 Tomcat
Vessel Name: Napoleon
Photos: Napoleon
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| Posted: Wed Oct 27, 2010 2:15 pm Post subject: Sweet spot |
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Hi Mike,
I found it incredibly difficult to find but once I found it - it seemed very obvious somehow.
You have to look very closely - get your head down there as much as possible with a light. You will notice the slight indentation that appears to be about 12" X 12" as Charlie said above - starboard side forward of the bilge pump.
Good luck.
--Matt
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Captain Matt
Former owner of Napoleon (Tomcat) Hull #65 w/Counter Rotating Suzuki 150's. |
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Matt Gurnsey
Dealer
Joined: 11 Nov 2008
Posts: 1532
City/Region: Port Orchard
State or Province: WA
Photos: Kitsap Marina
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| Posted: Wed Oct 27, 2010 2:18 pm Post subject: |
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Are you using a flush style transducer, or will it be using a fairing block?
The fairing block style will require certain placement that may fall outside the non cored area, and could disrupt water flow to the engine, possibly causing ventilation and over heating issues.
The flush style units don't have a paddle wheel, but are good performers. Units with tilted elements offer great performance, and are available in 1Kw models. They require bigger holes, and we have installed a couple in deep v hull trailered boats to avoid having a transducer and fairing block hanging down to get caught on the triler bunks or rollers.
Check out Airmar's website- http://www.airmartechnology.com/
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Matt Gurnsey
Kitsap Marina
www.kitsapmarina.com
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Mike...
Joined: 13 Dec 2008
Posts: 470
State or Province: VA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Photos: Accelerando
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| Posted: Wed Oct 27, 2010 4:19 pm Post subject: |
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I don't know fellas, my head is pretty big. 
Of course it doesn't help that the TomCats are designed to repel all attempts by their owners to accessing the bilge.
Charlie, you'll loan me your long-armed monkey, right? I'll let you hold on to one of my kids as collateral. (...and may God help you there...)
So did you fellas install your transducer there? If so, how did you seal it. It just seems so wrong to drill holes through a perfectly good hull!
Matt, thanks for the Airmar ink. We are planning a flush mount with temp (like your second example -- thanks for the pics). I am hopeful that GPS speed will be accurate enough.
--
mike |
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matt_unique
Joined: 27 Feb 2007
Posts: 1881
City/Region: Boston
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C-Dory Year: 2007
C-Dory Model: 255 Tomcat
Vessel Name: Napoleon
Photos: Napoleon
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| Posted: Wed Oct 27, 2010 4:37 pm Post subject: Ducer |
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| Mike... wrote: | ...
So did you fellas install your transducer there? If so, how did you seal it. It just seems so wrong to drill holes through a perfectly good hull!
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Hi Mike,
Your choice of terminology at the start threw us...you said you were going with the thru hull not the shoot thru. The thru hull means drilling, the shoot thru means no drilling. Your post above leads me to believe you actually want the shoot thru type to avoid drilling.
It's one of those funny terms that make no sense..."In-hull" is the actual term for shoot thru but makes no sense. Ha ha!
Although contrary to the instructions on my Airmar In-hull aka shoot thru transducer, I used 3M 42 or 5200 to seal the fluid tank to the hull. The instructions called for silicone but I find that is not strong enough.
I scuffed my hull with sandpaper, cleaned it up good with acetone, then installed the transducer fluid tank with 42/5200. Once cured, I added my non-toxic antifreeze, set my housing offset angle to 14 degrees, and installed the transducer unit. 3 seasons strong with zero problems. |
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thataway
Joined: 02 Nov 2003
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Vessel Name: thataway
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| Posted: Wed Oct 27, 2010 4:39 pm Post subject: |
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GPS speed over the ground will be more accurate, than a paddle wheel speed thru the water.
Usually one makes a backing block--I prefer solid teak--for the transducer inside of the hull. 4200 for the transducer, and 5200 for the back up block.
Now if you want to know how to do it with the boat in the water--you will have to send me a PM.
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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
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Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
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Home port: Pensacola FL |
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Mike...
Joined: 13 Dec 2008
Posts: 470
State or Province: VA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Photos: Accelerando
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| Posted: Wed Oct 27, 2010 4:59 pm Post subject: Re: Ducer |
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| matt_unique wrote: |
Hi Mike,
Your choice of terminology at the start threw us...you said you were going with the thru hull not the shoot thru. The thru hull means drilling, the shoot thru means no drilling. |
Nope - I do mean thru hull. We are indeed drilling.
I just don't have to like it, that's all.
It will probably be the AirMar B164, but I have to figure out the tilt.
Any thoughts on this one?
---
mike |
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Captains Cat
Joined: 03 Nov 2003
Posts: 7313
City/Region: Cod Creek>Potomac River>Chesapeake Bay
State or Province: VA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Captain's Choice II
Photos: Captain's Cat
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| Posted: Wed Oct 27, 2010 5:40 pm Post subject: |
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If you promise to keep the kids, I'll GIVE you the monkey! I have had kids and learned my lessons 2X. Once I put in my big hatches, I'll be able to let the monkey go. Hatches will be on the way shortly from my buddy Marc at Wefings.
BTW, I found out they pronounce it "weeeeefings", not "wefings" as I thought it to be...Learn something every day. |
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Mike...
Joined: 13 Dec 2008
Posts: 470
State or Province: VA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Photos: Accelerando
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| Posted: Wed Oct 27, 2010 6:31 pm Post subject: |
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| Captains Cat wrote: | | If you promise to keep the kids, I'll GIVE you the monkey! I have had kids and learned my lessons 2X. |
Darn! No one ever takes me up on that deal.
| Captains Cat wrote: | | Once I put in my big hatches, I'll be able to let the monkey go. Hatches will be on the way shortly from my buddy Marc at Wefings. |
Great; I hope it makes things a little easier for you.
Still, I think we need more access down there. If I have time before the boat has to go into winter storage, I am going to go with the Beckson plates fore and aft in each of those Damn Leaky Fishboxes. And maybe also install the the neat vents Brian installed in his (at the bottom of his post).
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mike |
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Captains Cat
Joined: 03 Nov 2003
Posts: 7313
City/Region: Cod Creek>Potomac River>Chesapeake Bay
State or Province: VA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Captain's Choice II
Photos: Captain's Cat
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| Posted: Wed Oct 27, 2010 8:32 pm Post subject: |
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Mike, those aren't "vents" they are drains. They will drain the water to a box like your shower sump where you'll have to install another pump. More to deal with. Why not cut a small hole in the BOTTOM of the boxes and let them drain into the bilge where you already have a pump? KISS principle.
I still don't want your kids.... Why not get one of those new life insurance policies where, they give you the money now and when you pass into the next world, THEY have to pay it back! You'd be surprised how their attitude towards you and your well-being changes!!
Charlie |
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rogerbum
Joined: 21 Nov 2004
Posts: 5927
City/Region: Kenmore
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C-Dory Model: 255 Tomcat
Vessel Name: Meant to be
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| Posted: Wed Oct 27, 2010 11:03 pm Post subject: |
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| thataway wrote: | GPS speed over the ground will be more accurate, than a paddle wheel speed thru the water.
<stuff clipped> |
True but it really depends on what your purpose is for the paddle wheel. If you fish, what matters while trolling is speed relative to the water (which is what you get from the paddle wheel). Speed over the ground is great for navigational purposes but not so much for trolling. So in my mind the real question is "What's the application for which you want to know speed - navigation or fishing?"
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Roger on Meant to be |
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Mike...
Joined: 13 Dec 2008
Posts: 470
State or Province: VA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Photos: Accelerando
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| Posted: Wed Oct 27, 2010 11:47 pm Post subject: |
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| Captains Cat wrote: | Mike, those aren't "vents" they are drains. They will drain the water to a box like your shower sump where you'll have to install another pump. More to deal with. Why not cut a small hole in the BOTTOM of the boxes and let them drain into the bilge where you already have a pump? KISS principle.
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This was the vent that Brian mentioned (well, I think he called it a vent). I was planning on mounting them in the floor of the boxes so that water can drain into the bilge. So, I think you are in sync there.
But the problem is that this defeats the point of a self-bailing cockpit a bit. However, if we end up in rougher water, I suppose I can put the little green plug in.
| Captains Cat wrote: | | I still don't want your kids.... Why not get one of those new life insurance policies where, they give you the money now and when you pass into the next world, THEY have to pay it back! |
Heh - great idea.
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mike |
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Mike...
Joined: 13 Dec 2008
Posts: 470
State or Province: VA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Photos: Accelerando
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| Posted: Wed Oct 27, 2010 11:56 pm Post subject: |
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| rogerbum wrote: | | So in my mind the real question is "What's the application for which you want to know speed - navigation or fishing?" |
Hi Roger.
Good question. Navigation. Our idea of fishing is perusing the menu at our favorite restaurant.
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mike |
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Mike...
Joined: 13 Dec 2008
Posts: 470
State or Province: VA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Photos: Accelerando
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| Posted: Thu Oct 28, 2010 12:00 am Post subject: |
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| thataway wrote: | | Usually one makes a backing block--I prefer solid teak--for the transducer inside of the hull. 4200 for the transducer, and 5200 for the back up block. |
Hi Dr. Bob.
I must be missing something. So are you saying 5200 the block to the hull and drill through both to mount the transducer? Then tighten down the nut onto the block?
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mike |
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