I need to keep the saltwater from getting in between the two surfaces somehow. My concern there is salt corrosion between the aluminum hull and the plate. I plan to replace it with a proper aluminum plate soon. On my one aluminum boat, it has a 3/8" wood panel across the rear, I guess it was put there to protect the hull. how about a thin coating of silicon between the pieces? Admittedly, it would probably be a pain to separate the two later on but if you don't use to much, it's probably ok. In regard to one persons worry about galvanic action between dissimilar metals. Or, you can go to one of the aftermarket suppliers and buy a ready-made aluminum transom plate with detends for the clamps molded in. As others have said, you just have to have something to fix the problem - a hollowed out portion on the plate for the clamps to sink into, a piece of small square bar welded across the area just above where the clamp cups will be, etc. And, while I understand the logic behind the advice to use a safety chain, and don't disagree with it, that really shouldn't be the first line of defense against movement of the motor.įortunately, you can still use the plate. If the plate doesn't have something to stop upward motion, you very definately can lose your motor. I agree with the comments about lack of friction when a transom plate is used. It just seemed like a lot of weight hanging on the back of a 16' runabout. The 85HP Evinrude is the max for the boat and I just didn't like the way it sat on the bare transom. I did make large stainless washers for the inside of the motor bolts as well to help distribute the bolt load on the wood around each hole. The wood inside is new but wood is still softer than aluminum. Although the transom is solid, I like the added security of having it there and knowing that the motor won't tear into the soft aluminum hull. I need to keep the saltwater from getting inbetween the two surfaces somehow. I also use a safety chain on all clamp on motors.
That way the motor can slip up or off to one side. On those that clamp on, I make a plate with countersunk areas for the clamp screws to seat on and secure that to the inside of the transom. I also bolt all of my motors that allow it. I run a thick aluminum plate under all of my motors, it helps to spread out the load and protect the surface of the fiberglass or aluminum hull.
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