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Transducer mount help for a cat

Old 03-20-2006, 05:08 PM
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Default Transducer mount help for a cat

I have an 18' Seacat trailer boat. and was wondering if it's possible to use a thru hull? If I can get one in there will the trailer bunks tear it up?

Does anyone make cat friendly tranducers?

Any advice would be appreciated if I have to transom mount it.
Old 03-20-2006, 05:26 PM
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Default Re: Transducer mount help for a cat

If the bottom isn't cored, I'd go with a shoot-through. Then you have no worries about bunks or turbulence.
Old 03-20-2006, 05:57 PM
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Default Re: Transducer mount help for a cat

Will a shoot-through give the same results as a transom mount?
Old 03-20-2006, 06:18 PM
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Default Re: Transducer mount help for a cat

There are some tradeoffs. Some of the power is lost shooting through the hull and temperature sensitivity goes way down. But you'll be able to read bottom at any speed and don't have to put a hole in your hull. There would be no worries about bunks and the installation would be easier.
Old 03-21-2006, 08:48 AM
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Default Re: Transducer mount help for a cat

I have the same problem. I called around for advice and I am going to mount my transom mounted unit on the starboard side of the starboard hulls keel (on transom) as low as pos able and fold up when I have to. You want to stay away from the water that comes thru the tunnel.
Old 03-21-2006, 08:50 AM
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Default RE: Transducer mount help for a cat

My buddy has a shoot thru (Garmin) in his cat and works great. Never loses bottom, 0-40 mph.
Old 03-21-2006, 07:37 PM
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Default Re: Transducer mount help for a cat

I put mine transom mounted on the starboard side of the starboard sponson. People do mount thru hulls on Worldcats but with varying results. I have been real satisfied with my transom mount Furuno.....I came from my last boat with a thru hull Furuno 525.
Old 03-21-2006, 07:47 PM
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Default Re: Transducer mount help for a cat

i was very unhappy with several attempts at transom mounting on my 1995 21 seacat, solid glass hull. Went to a Sitex 106L big bronze puck epoxied inside the starboard hull about 3 feet forward. shoot thru works great. no hole in the hull. and note, if you lower the transom puck down far enough to work reliably it sends a bubble stream into the prop and makes it cavitate. took all the paint off the front side of my starboard prop.
Old 03-21-2006, 08:09 PM
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Default Re: Transducer mount help for a cat

cfwegman - 3/21/2006 7:47 PM

i was very unhappy with several attempts at transom mounting on my 1995 21 seacat, solid glass hull. Went to a Sitex 106L big bronze puck epoxied inside the starboard hull about 3 feet forward. shoot thru works great. no hole in the hull. and note, if you lower the transom puck down far enough to work reliably it sends a bubble stream into the prop and makes it cavitate. took all the paint off the front side of my starboard prop.
Where exactly did you put the transducer . I have the same boat and had a transom mount but it doesn't work very well. I wanted to install a shootthru but was wondering where to place it.
Old 03-23-2006, 11:27 AM
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Default Re: Transducer mount help for a cat

Great feedback, anyone else?
Old 03-25-2006, 07:29 PM
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Default RE: Transducer mount help for a cat

I installed a Furuno thru hull that came with my 582L. I cut the bunk back on that side and have never had a proplem.
Old 03-25-2006, 08:26 PM
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Default Re: Transducer mount help for a cat

I put a transom mount furuno on my 25 seacat and I love it. Only problem is that I loose speed at high speed.
Old 03-26-2006, 10:34 PM
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Default Re: Transducer mount help for a cat

I have a Twin Vee 22. I've got the Garmin 3005. I have the GSD20 analog sounders. I am using the shoot-thru inhull transducer, and it seems to perform well and does not lose bottom at 35 mph. As far as a sounder goes, it is good, but I have a Raymarine DSX600 sitting next to it which I think is a little better sounder. I have a transom mount 'ducer for the DSX600, and it does lose bottom at ~25-28 mph. DSX600 'ducer is on the starboard side starboard sponson while the Garmin 'ducer is on the port side port sponsor (thru hull on starboard side port sponson). The difference in transducer mounts could account for some of the DSX600's advantage - also, just got the GSD20 so am still learning it. I am also experimenting with the angle of the inhull - moved it from 8 deg to 12 deg as it is hard to get a precise deadrise measurement on a curved hull - just to see if that improves the Garmin's performance.
Old 04-20-2006, 05:23 PM
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Default Re: Transducer mount help for a cat

the puck is epoxied to the inside of the hull about 3 feet forward of the transom in the starboard hull. Not an easy place to work, but the seacat has 2 access ports, one in the bottom of the storage compartment and one in the splash well. I put the light in thru the one in the storage box and worked thru the splash well. THe boat has a big transom stiffner stringer glassed to the hull, BUT its not on centerline, its about 3 inches to the outside on both sides. So the very center line of the hull is available for the puck to sit on. I used WV Thom's method and made a dam to pot the puck into using kids playdough. worked ok, but be very careful as it is tender stuff and just barely sticks to the hull. First, roughed up the hull removing the gray down to resin with the grinder, vaccum the dust, make playdough dam, mix resin very carefully so as not to stirr in bubbles and slowly resin in the dam just deep enough to completely cover the bottom of the puck, gently set the puck into the resin with a slow angling motion so as not to trap any bubbles under the puck. done.
Old 04-21-2006, 01:39 AM
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Default Re: Transducer mount help for a cat

I ended up with a 337c and siliconed the transom mount transducer that is suppied with the unit (no options for a shoot-thru) inside the hull about 18" forward of the transom on the port side and it worked like a champ. I probably should have sanded it flat first but figured I could do it over if it didn't work and it was gettin late. I'm happy and it's a done deal. Thanks for all your input, I figure I saved $$ on a shoot thru and lots of time!

Only you will know why I will always fish my boat on the port side....shhhh! Actually it's only about 6" off centerline which is closer then most externally mounted units.
Old 04-21-2006, 02:12 AM
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Default RE: Transducer mount help for a cat

I made a little "picture frame" big enough to house the transducer and put it in place with Marine Tex. I then filled it with several layers of epoxy, keeping it down to less the 1/8 inch per pour to prevent cracking as it hardened. Once I had a level area big enough for the ducer, I put it in place with a thin layer of slow setting epoxy. I'll neve drill another hole through a hull. Mine works great. Once it was done , I broke away the frame and it is neat, tidy and works.
Old 04-23-2006, 10:32 AM
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Default Re: Transducer mount help for a cat

the other great thing about the shoot thru on a cat is for trailering. there is ablolutely no place on a cat hull to locate an external puck forward of the transom that will not be in conflict with the trailer bunks. you did the right thing!!

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