In Hull Transducer - SailNet Community
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post #1 of 6 Old 06-17-2015 Thread Starter
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In Hull Transducer

I recently purchased a Sonar Phone TBox ( - SP200 ? T-BOX #SP200 ) and mounted it in hull. It works good however it is at more than a 10 degree angle. I am wondering if anyone knows how much fiberglass a transducer can penetrate? Reason being I can just form a "pad" on the center line and just have the transducer level.
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post #2 of 6 Old 06-17-2015
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Re: In Hull Transducer

In order for the transducer to work, it needs a good mechanical connection to the hull. Putting a shim in is going to make that more difficult. I wouldn't bother as you state it's working well.
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Re: In Hull Transducer

Have you tried the wax trick? It might be enough to get you more level, and may still work well to embed it into wax.
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post #4 of 6 Old 06-18-2015 Thread Starter
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Re: In Hull Transducer

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In order for the transducer to work, it needs a good mechanical connection to the hull. Putting a shim in is going to make that more difficult. I wouldn't bother as you state it's working well.
It would just be something like a fiberglass "bed" that I can just make with fiberglass and resin so it would be permanent part of the boat. The issue is, how accurate is the depth then if it is at a far angle? If it says it is seeing 20 feet in reality could it just be 15 feet due to the angle? Or the other issue is, if it is shooting off to the lest then really I am not able to see the depth where I actually am.

I will have to post some pictures, but was just curious if anyone knew how far it can penetrate.
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Re: In Hull Transducer

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Have you tried the wax trick? It might be enough to get you more level, and may still work well to embed it into wax.
Not a bad idea, I may have to try that. Right now we just used a temporary silicone type adhesive that will just peel up for moving it around.
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Re: In Hull Transducer

I don't think its an accuracy issue. The beam from the transducer is already a wide beam, typically 20 to 40 degrees. If it wasn't, depth sounders wouldn't work on sailboats when heeled. Remember the pulse has to bounce off the bottom and return. The portion of the beam going straight down is going to produce the strongest return, and it's going to be the correct depth.
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