I have a lund alaskan. I want to install a transducer on the back. Do I need to install a board and connect it above the water line and than attach the transducer to the board, or can I install the transducer directly to the boat flush with the bottom? If so, do you use some type of pipe thread / tape to keep the screws from leaking? What are my options?
I prefer the board method, but it’s not required. The board simply saves adding extra holes to your boat. I’ve done both.
I use a clear silicone when installing ducers. I put the silicone in the pre-drilled holes and also on the screws themselve. Then I dab a around the screw heads once they are set.
Good luck, it’s never easy drilling holes in your baby!!
I agree with Kooty, a board is the right way to go.
Also make sure to install the tranducer on the side where the prop turns down. This eliminates some of the interference caused by prop wash 
With most outboards this will be on the right side of the boat.
I agree with Kooty and Bret. I just bought a transom mounting plate this spring for my new boat from Cabella’s on line and it worked great. 
I mounted it just as Kooty said. Good luck 
It’s a personal decision. I don’t like then, never have and never will use them. Think they look terrible!
Either way, do as kooty says and use the silicone on every screw/hole. I also use the silicone to hold the wires in place. Just a dab every foot or so will hold the wires in place.
-J.
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It’s a personal decision. I don’t like then, never have and never will use them. Think they look terrible! -J.
The trick to is to paint the board the same as the hull color. I have not personally tried painting these boards, so who knows if the paint will stick.
Good point. They should make them in different colors other than white.
If you do use a board, make sure to leave a gap at the bottom. If that board catches any water drag, it will seriously affect handling of the boat.
-J.
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f you do use a board, make sure to leave a gap at the bottom. If that board catches any water drag, it will seriously affect handling of the boat.
Good point. It will also interfere with your sonar. Keep the board slightly above the bottom of the boat (just barely) and the bottom of the ducer just flush with the bottom of the boat.
The ones at Cabellas come in several colors. I lucked out as the off white one almost perfectly matched my lower color so you hardly notice it. 
Yes, they do have them in black, grey and white.
Anyone got any good tips to keep these things attached 
Mine keeps comming loose and unglued. I’ve used the screws, and silicon, but it only lasts for a year. I’m going to look into a metal anchor type setup now. Looks like I’ll have some time to play with the boat today with the weather
Can you access the transom from the inside hull??? If so, use a stove bolt and double nut with a lock washer and some locktite to finish her off.
No access, I think I’m going to try and put some anchors in there somehow.
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