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Bertram 28 walk around outboard

Old 09-22-2015, 06:54 PM
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Default Bertram 28 walk around outboard

Doing a 28 Bertram outboard conversion. Putting a pair of F250s on pretty much like tslatery has done. Cut everything down to the gunnels and am building it back. Joel over at gulf stream composites is helping advise me on the project. Lots posted there as well



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Old 09-22-2015, 07:04 PM
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Looks like hell.
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Old 09-23-2015, 04:25 AM
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Nice stuff at the other site. Post them up here and would like to see more on your bracket and top build.
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Old 09-23-2015, 05:15 AM
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Old 09-23-2015, 05:34 AM
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Nice! Looks she's gonna be a beast!
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Old 09-23-2015, 05:55 AM
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Console is interesting. Looks like a fun project, great hull
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Old 09-23-2015, 05:58 AM
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Nice! Looks like a similar to the Blackfin 29. 250's should push it well. Let's see some interior shots.
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Old 09-23-2015, 06:00 AM
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More pictures please !
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Old 09-23-2015, 06:32 AM
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Originally Posted by captbone View Post
More pictures please !
Please and keep us updated often.
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Old 09-23-2015, 07:13 AM
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Thanks guys. Couple shots of the bracket. I have a ton more here http://gulfstreamcomposites.forumoti...tboard-bracket along with how I approached it. I will migrate some more photos over







Interior so far. The fuel will be placed in the area that was formerly the engine area. Basically you have 2' clear between console and gunnels to give you a sence of scale. The third photo shows the forward deck in place and a layer of 12oz on hull insides.







This is a shot of the hardtop after I laid it up and under vacuum. It is 9' long and 7'6 wide. The second image is a concept for the tower.




Last edited by Daytrip01; 09-23-2015 at 07:51 AM.
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Old 09-23-2015, 07:52 AM
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Subscribed with a question....Why wouldn't the fuel tank move forward to offset the bracket/twins?
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Old 09-23-2015, 11:02 AM
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Based on others on the site who have done this to the open version I decided to put the tank in the same location which is the engine bay. I did some balance calcs using the original CG as the datum and it actual is almost exactly the same balance as with inboards because fuel moves forward a lot, engines move way back but flotation is added way back with the bracket as well. That's at rest. When you look at tslatery's boat it floats really nicely and the stern is actually much higher then with inboards. I decided to locate my tanks largely based on that boat as well as the boats that had the original sea drives on them from the factory which were configured similarly.
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Old 09-23-2015, 11:39 AM
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I would have 100% gone with more beef in the transom...
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Old 09-23-2015, 12:07 PM
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The stringers go through the transome and terminate at the clamping board on the bracket. When I made my plan there I looked at a dynamic load of 6gs and a thrust load of 3500lbs and the strings carried that without any help of the transome. But I doubled them and then cored the transome 2.5" thick. The bracket is built onto the boat not bolted so it is belt and suspenders. That being said when I look at those 250s back there I hear you.
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Old 09-23-2015, 12:08 PM
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Daytrip, looking great....yes tank is where inboards are normally deployed, center/aft. I did remove the old fiberglass tank in stern. I was surprised that all of the puddy and tabbing from the tank was very easy to remove. I have been finally able to use the boat again as I had her dry docked while waiting for my boat lift to be installed. I you ever get up to Lake Erie I would be happy to take you out for a ride....wonderful riding hull! All of your hard work is really going to pay off as the quality of the product you are modifying is well worth your time! Your bracket looks exceptional and you are going to love the ride with outboards.

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Old 09-23-2015, 01:32 PM
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Taslattery, thanks! You are the one that got me started on this believe it or not. Your rig and my neighbors repower actually. This is my second 28B and the increased speed will be a nice improvement. Thanks for the invite! Likewise you will be welcome to a ride out Palm Beach inlet next summer.

That putty made with polyester does not stick real well for sure. The liner was the same way. This one is all epoxy. I was going to foam core everything but it needs some weight. Using meranti plywood instead.
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Old 09-23-2015, 01:45 PM
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Great Idea on the Fiberglass Bracket vs. Aluminum
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Old 09-23-2015, 02:01 PM
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Looks great. Keep it up.
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Old 09-23-2015, 02:29 PM
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Old 09-23-2015, 03:22 PM
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