three section transom question ?

JJB

Petty Officer 1st Class
Joined
Dec 28, 2006
Messages
274
I have a 20" bayliner trophy that I am replacing the transom . during the rip out I found It has a three section transom , the plywood was made in three different section to get the curve of the transom . I Have heard that a single transom are the strongest . Is this why my boat is only rated to a 175 hp ?
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,748
Re: three section transom question ?

JJB, I would presume the transom was a single laminated piece, when it was made. I wouldn't think this would affect HP rating. What kind of boat are we talking about?
 

sdunt

Petty Officer 1st Class
Joined
Sep 11, 2005
Messages
389
Re: three section transom question ?

JJB, so there is some curve or angles to your transom? Maybe something like this:
____
/ \

If so then the manufacturer was trying to do the best they could with the wood.

If the curve or angles are shallow enough you might be able to build a one piece transom, but its going to get thick in the motor well area. So, 1. will you be able to remount the motor with a thicker transom there. And, 2, will your splash well fit back on??

Pictures. You can 'blog' your project for FREE at www.shareaproject.com and its also a great way to store pictures to link with forum posts.

The reason I ask those questions and where I am going with this is that you can kind of build up a curved or angled transom by gluing or laminating pieces to a sheet of plywood. Think of it this way. Cut a 3/4 inch piece of plywood that will fit all the way across your boat and put it as close to the transom skin as possible. There will be a gap in the center between it and the fiberglass skin. Measure to see what size and potentially thickness of 3/4 ply piece you can put in between the 1st piece and the skin. Keep building up and adding pieces of ply between the 1st sheet and the skin until you have re-created the curve / angle.

In order to make the transom strong enough, you really need a 2nd full width piece of 3/4 inch plywood laminated to it on the inside. The problem is that the wood in your motor mount area is going to get very thick, maybe 3 inches or more. Basically something you can not get a motor on.

If this is a simple curve, you could laminate up the necessary piece, like a curved railing, but laminating layer after layer of 1/8 inch plywood into the boat. you're going to need Norm Abrahm's clamp collection to accomplish all of that..

Get us some pictures and we'll have a better idea..
 
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