Transducer

FB 28 Tunester · Post by **FB 28 Tunester** » Tue Oct 18, 2011 10:22 pm

Hi, I am new, but have enjoyed the forum. I have a question , I have a FB 28 trojan and need to know which degree of offset I have on my hull.
The transducers come in several different degrees? Can someone help ?
Thanks,
Jim

Big D · Post by **Big D** » Tue Oct 18, 2011 11:00 pm

Welcome aboard. I'm sure someone with a 28 will be along shortly but I suspect it will depend where on the hull you plan on mounting it as the angle will vary. If you get one with no offset, you can get the fairing block for it and cut what ever angle you need based on mounting location.

prowlersfish · Post by **prowlersfish** » Wed Oct 19, 2011 6:48 am

Correct , but in my case I mounted one of mine mid ship and did not use any fairing block so it maybe at a 10 deg angle . No big deal IMO .

larryeddington · Post by **larryeddington** » Wed Oct 19, 2011 8:01 pm

Well just happens I am dealing with that very thing as I have removed two old transucers from hull. It seems like adjustable transducer only go to 20 degree so that is out. I took an angle measuring device and determinde I had a 30 degree angle from verticle. Ergo I can cut the proper adapter piece to that degree, bed it in and it should work.

But you ask where is that on the hull, okay, my holes are approximately centered between the aft bulkhead (engine bh) and a rib that runs from stringer to stringer. To simplyfy about 18 out from rear bulkhead and about 6 inshes outboard of keel.

Hope this helps. I am going do test angle cuts in wood until I am satisified I have a verticle mount, then transfer angle cut to fairing adapter.

Big D · Post by **Big D** » Wed Oct 19, 2011 8:44 pm

Probably common knowledge but I'll put it out there anyway. If you choose to make your own fairing block, start with a piece of material long enough to accomodate the transducer and then some. The angle of the hull where mounted will determine the thickness of the block that you'll need (and the mounting thickness required for the ducer). Don't forget to include the thickness of the hull. Use a piece of material that has parallel top and bottom surfaces (like a 4x4). When you figure out the angle, make one single cut. You'll have two halves; one for the bottom and the other will be a perfect match for the inside. Drill the hole into the piece before you cut it. It's best to use a drill press, this will ensure the hole in the block is quare to the top and bottom surfaces. Once you cut the piece, use the bottom portion to aid in getting a square hole when drilling through the hull. I would not use 5200 for this, you may need to remove it some day.

Paul · Post by **Paul** » Wed Oct 19, 2011 9:25 pm

FB 28 Tunester · Post by **FB 28 Tunester** » Thu Oct 20, 2011 12:02 am

Thanks everyone for giving me so much info.