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Old 12-18-2006, 07:04 PM
FELLOW-SHIP FELLOW-SHIP is offline
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Join Date: Feb 2002
Location: Cooper City, Fl
Posts: 1,798
Default Re: Thru-hull mounting question

Ha Realescape1

I did not take any pictures of what I did but I will try to explain it for you.
On the salt water scoop I didn’t use any backing plate you can just drill the hole through the bottom of the boat on either side of the center line don’t want it in front of your prop use the brass scoop nut on the inside and sealing it with 5200 on the outside some of the scoops have 3 holes for screws and if you want you can use them as well then attach a on off valve a 90 degree elbo and then your live bait pump. There was a large glob of fiberglass putty in that location for me and the whole was where the old fitting was I just removed the old and replaced with new brass fittings.

Now for the transducer – that’s another story. First off my ducer for my finder was shaped kind a like a football so I cut In The Center Line of the Boat a hole to allow the ducer to drop right through. Then I laminated fiberglass blocks together with the same size hole in all of them that making the outside wall approx ½ to ¾” thick of glass blocks the last block which was approx 3/8” thick I made with the smaller hole in it to accommodate just the pipe fitting of the ducer so I could screw the nut to it to hold the ducer onto this all glass fabricated ducer holder. Then I added a layer of glass over the top just to make sure it was totally shock resistant. Then I epoxy that to the inside of the boat and then add two more layer of clough over it to make sure it becomes a part of the boat. Then I just ran the ducer cord up through the hole and 4200 the ducer in side the ducer box and screwed the nut in place. The bottom of the ducer is at the same level as the bottom of the boat. No cavitations, no bubbles just part of the bottom of the boat. I get excellent readings running 30 + mpr it is definitely the way to mount a ducer on a boat. There was a guy from the Mako sight that made a reverse mold out of glass and did it that way I thought that was a excellent way to go and if I ever needed to do another I would make a reverse mold and do the same thing.

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