Build a Transom Bracket

Apollo HT

Cadet
Joined
Feb 26, 2005
Messages
7
I am planning to build a 30" - 36" setback transom bracket. I am working on a design on CAD, but really have no experience with the construction. If no one responds to this post, I will be forced to figure it out myself...but I could sure use some help from some that have tackled this project.<br /><br />I plan to hang a Suzuki DF250 on the back of it, and it weighs almost 600 lbs. I am aware of the transom modifications I will have to do, and feel confident I have those modifications under control. the bracket is my focus, and NO I am not interested in paying Gil, Armstrong, Stainless, or any of the rest of them, for a bracket. Maybe it is the easiest way...but for me, I want to do something, few are interested in doing.<br /><br />Any help is appreciated.<br /><br />thanks.
 

phatmanmike

Captain
Joined
Oct 24, 2003
Messages
3,869
Re: Build a Transom Bracket

are you planning on using fiberglass/wood for construction? or are you planning on using some metal in this beast?<br /><br />you really didnt specify...<br /><br />if you feel confident that you can design it properly to hold the weight and brute force that this engine is gonna put out, than i say go for it.<br /><br />if you honestly have no idea how youre gonna put it together... id say leave the idea alone.<br /><br />the thought of having my 14,000 dollar , 600 pound investment hanging off the back of my boat is awfully scarey sounding to me.<br /><br />by the way, what kind of boat is it going on?
 

Apollo HT

Cadet
Joined
Feb 26, 2005
Messages
7
Re: Build a Transom Bracket

I have a 25' Apollo cuddy, with a hardtop. It had an old OMC 235 I/O stringer, which I am no longer interested in taking a chance it will fail...as the engineering is close to 40 years old.<br /><br />My plan is to use fiberglass and plywood, utilizing the flotation style bracket, and figure out a way to add a series of internal braces inside the bracket. Aluminum intitially sounded like the ticket when I first began the design, but if welds are not done properly...which I would not have control over...then I would be concerned about my investment hanging off the back. <br /><br />Tieing the plywood together, prior to a mat/woven/mat/etc. layering, is where I am specifically looking for help. I understand the process of rabbeting, but feel maybe some aluminum angle would be more appropriate.<br /><br />I am also trying to figure out mounting height of the transom bracket, which if you follow the rule of thumb...1" per foot of setback...leads me to hang the bracket appropriately higher. My concern is mounting it too high. As you know, you can always raise an O/B, but to lower it past the motor mount on the bracket, would require me to cut it...don't want to do that. Also considered an adjustable motor bracket...not hydraulic...but at least offers me a lot more flexibility with mounting my transom bracket.<br /><br />I am looking for help from people that have done this before, so I can gauge my engineering. I have a habit of over-engineering, which in this case, will just add weight. But if I know of someone that built a transom bracket a certain way, and are having no problems with and equivalent sized motor, I will then know how much plywood, how many layers of fiberglass, and what kind of internal bracing will handle my Suzuki...of course add a little extra, just to be safe.
 

jshoes52

Petty Officer 2nd Class
Joined
Aug 21, 2004
Messages
113
Re: Build a Transom Bracket

Apollo, you are in luck...someone just posted a whole series of pics of building a bracket. I copied the thread and pics and will try to paste. If this doesn't work, I'll follow up with a link:<br /><br /> <br /><br /><br />Posts: 223<br /><br />Registered:<br />2003-07-07<br /><br />Location: Pittsburg California A little something I did on one of my days off <br /><br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /><br />Strick<br />-----<br /><br /> http://www.casdvm.com/photos/SeaCraft Project/
 

swist

Senior Chief Petty Officer
Joined
Jul 1, 2004
Messages
678
Re: Build a Transom Bracket

One of the reasons brackets are made of aluminum is weight - A bracket gives you a lot of convenience advantages and a full transom, but in exchange you are hanging a lot of weight farther back than it really wants to go - potentially leading to various handling problems (porpoising, inability to backup stright, etc). So it is essential to keep the bracket itself maximum strength for minimum weight. Glass is not likely to achieve this. I would also note that some of today's very heavy four-stroke outboards are asking for trouble on brackets, unless the whole boat was designed from the beginnning with that weight distribution in mind.
 
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