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Copying a 31 Bertram in Quepos Costa Rica

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Copying a 31 Bertram in Quepos Costa Rica

Old 04-30-2017, 10:32 AM
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Old 04-30-2017, 11:09 AM
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Default I hope you have done your home work? 31 Bert was a split mold.

Originally Posted by SailFishQuepos View Post
I see all sorts of people doing Bertrams, mine isn't for sale, it'll probably just be a one off, I'm hoping they don't bother me. That link above is a guy straight up copying the bertram and then selling them. I'm not even close to doing that. When I did the Ocean Master a year back and the owner actually called me and thought the project was cool. It would be bad publicity if they shut down people that really wanted to own a Bertram, but couldn't afford one, from building their own. I don't think they will bug me, we'll see.
It was split down middle because of slight tumblehome and outer chine spray rail are wider then Gunnels. Not many people knew this.
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Old 04-30-2017, 01:24 PM
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2 piece mold

Yeah, not a big deal because we are going to have to make the mold in two pieces anyways. I was planning on bolting it together in the middle, or if I get really lazy, just cutting wheel the thing apart when I get the boat done...

I like the overlay schedule they talked about in the 31 article the guy posted above. Good stuff. They say they lay one side and overlap a little and then lay the mold on the other side and do the other side, and switch sides every layer. Sounds like a good plan. I need to make the mold where it can lay on each side and switch sides without thumping and knocking off the glass on the other side. Maybe do the bottom first so I can do it all in one day, and then the sides one day at a time? I don't know, we'll see what the mold looks like and what Harold wants to do.
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Old 04-30-2017, 01:37 PM
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Originally Posted by Ragtop409 View Post
That trailer has me a little scared. But I can't wait to see you build this machine!!! Rag's
We moved the boat about 50 feet, and in 50 feet we lost two tires out of the 8. Like the whole rim and hub and everything just fell off! Gotta love working in Costa Rica
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Old 04-30-2017, 02:18 PM
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Originally Posted by SailFishQuepos View Post
I can't do the single diesel on this one Just a straight up copy, I need a twin engine boat with AC anyways!
The 31 Bert. Is run best with no less than 300 hp diesels. Good luck
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Old 04-30-2017, 03:09 PM
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Originally Posted by SailFishQuepos View Post
I see all sorts of people doing Bertrams, mine isn't for sale, it'll probably just be a one off, I'm hoping they don't bother me. That link above is a guy straight up copying the bertram and then selling them. I'm not even close to doing that. When I did the Ocean Master a year back and the owner actually called me and thought the project was cool. It would be bad publicity if they shut down people that really wanted to own a Bertram, but couldn't afford one, from building their own. I don't think they will bug me, we'll see.
Patents are only 17 years if memory serves.

Mark from OM is one of the best humans you will ever meet.
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Old 04-30-2017, 03:17 PM
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Old 04-30-2017, 03:41 PM
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Originally Posted by Seaveyor View Post
The 31 Bert. Is run best with no less than 300 hp diesels. Good luck
I rode on three in the last year. One had twin cummins 210s cruised at 22, one had twin cummins 260s and cruised at 24 and one had cat 350s at cruised at 25 (very slow cruise, but the motors are tired). Not saying your wrong...but The one with 210 burned ALOT less fuel and had 18,000 hours with no overhaul, that sold it for me. The one with 350 had about 7500 hours and the motors were DONE. No way I'm going over 260hp, it was between the 210s and the 260s, but the idle made the decision for me. If we go to the FADS, that is all bump trolling, and at 900 or 950 rpm idle of the 260hp, it's more like slam trolling... The 300's troll great, have a great idle for bump trolling, but they last half as long and the saltwater after coolers are tough. If I want to keep the cost of the trips down for customers, I need to have motors that don't need to be rebuilt as often. I'm expecting to put over 3000 hours a year on this boat when i get it finished, maybe more.

I actually rebuilt a 31 with 210s a few years back, and that sucker was super heavy, we didn't do much if any weight reduction. And I can make up the little speed difference with my weight. I am not in Quepos right now, but on my desktop I have a picture of the 31 I redid that had 210s, we took out the front windows, i really liked how that turned out and I'm hoping to do the same thing with this one.
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Old 05-01-2017, 03:51 AM
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We have 315 yanmars, cruise is 27 knots. An overnight trip to the canyon ( 71 miles out+ trolling) fuel is averaging 132 gal. For the trip. The 31 Bert. Is not as heavy as some people think. Good luck
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Old 05-01-2017, 06:12 AM
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Old 05-01-2017, 07:38 AM
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Very cool project...
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Old 05-01-2017, 07:44 AM
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Followed all your other build threads and haven't really been on THT much since the oceanmaster but now I've got the motivation to actually get back on once in a while Really wish I could come up with the cash to go fishing with you this summer but you know how that goes... Best of luck to you on this one Capt. John
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Old 05-01-2017, 07:56 AM
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Originally Posted by Seaveyor View Post
The 31 Bert. Is not as heavy as some people think. Good luck

This right here....320 Luhrs is much beefier hull. With all of the divinylcell going into this hull it will be a comparative feather and quite happy with 2 x 210. And with very short runs...not much else to want.
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Old 05-01-2017, 10:00 AM
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so, you already built a "quepos 28"....so "quepos 31"?

should be a fun project!
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Old 05-01-2017, 10:39 AM
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Subscribed...again.
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Old 05-01-2017, 10:43 AM
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Old 05-01-2017, 12:03 PM
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Originally Posted by happyjack92 View Post
so, you already built a "quepos 28"....so "quepos 31"?

should be a fun project!
We'll see how I feel at the end. Maybe call it a custom 31 bert? Maybe Quepos 31....
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Old 05-01-2017, 03:48 PM
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Love your build threads, really looking forward to this one. I will be down to fish with you again next year probably March or April so lets move the schedule up a couple months.
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Old 05-01-2017, 04:11 PM
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Originally Posted by SeaSaw1 View Post
Love your build threads, really looking forward to this one. I will be down to fish with you again next year probably March or April so lets move the schedule up a couple months.
Hey, we will see where the project is at December January ish. Maybe?
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Old 05-01-2017, 04:44 PM
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I know this will be great to follow as it's been genuinely highly anticipated!
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