bertram31.com

Major

Definitely get some pictures if you can. Its always cool to see the build threads. Sounds like your winding it up so its almost time to enjoy all the work.

Major

Any updates? I wouldn't mind hearing about the paint too.

Major

Luckily here is SC we can still have most anything. I have a Mini 14 and a few AR's and they both have their good and bad points. I would say the weakest point with the MINI is magazine choices and the barrel gets hot quick. An ar15 will still get hot but you can choose a handguard to help with that...

Major

Thanks for the info. Thats good to know it will hold and not break down too quick. I may give this a go then since I feel like it will really help the boats appearance.

Marlin: That sounds about like my other caulking adventures. Ill definitely try to come up with a plan for the inevitable mess.

Major

I was looking over the articles and products again on this site and was looking at the window frames this time. I have a 28 and considered getting rid of my aluminum frames in favor of something like this but was curious if you could still be safe with changing the way the glass is installed. I see ...

Major

I think I have bought CorrosionX from academy sports too if you have one of those close.

Major

Thats a great looking boat and you sure found the right guy for the paint.

Major

Im a little late to the part but wanted to stop in. I went through the tech school deal from basic machining to tool and die making and finally to CNC topics in the end. For me the manual machining classes were definitely the way to go to get the basics down. Feeds and speeds are a big deal to learn...

Major

I was looking into some replacement engine mounts for the cummins 4BT and was curious how the aftermarket world is on mounts. Is it worth looking into anything else other than just a new set of Cummins mounts? I am making a stand for them out of the boat and need some mounts for that and the boat. I...

Major

Looks like a pretty big remodel. How does the walkway feel with the engine boxes like that? I wonder how much weight is lost using new cores inside the cabin vs all the plywood it had?

I'm interested to see how you go along with this so keep us updated.

Major

Major

I wouldnt go with a stag. Really what do you want out of the rifle? The AR can be built so many ways that that can dictate your options in some cases. Mine are all DI instead of gas piston so i cant comment on that other than why do you want the piston? As for the $1,200 deal what kind of handguard ...

Major

STraenkle: If you have the dyno guys info handy I would appreciate it but I'm a little ways away from starting and getting the to a point to sell or keep. My engines are on pallets too so they aren't installed in anything. The idea of making one still interests the do it yourselfer in me though. I'm...

Major

Yea thats what I was worried about. I thought the intercooler may help with the reliability but it probably wont be enough. If only the 6BT was a little shorter and thats what we had. I see that 250 HP is too far from the reliability margin even after some real modifications designed into the 4BTA. ...

Major

I think i'm up to speed now. For some reason I had it in my head that HP and torque were two completely different animals but see now they are highly related. That calculation helped me on that and now i can figure it both ways. 4BT 150 hp at 281.36 ft lbs of torque @ 2800 RPM's. 4BTA 250 444 ft lbs...

Major

The engines are not for a 31 but were originally intended for a 28 we have sitting on a trailer with no engines. After reading about some that were in use they seemed a little small. So it just happened to be one I just looked up since i had two. What i'll probably end up doing is getting them in go...

Major

I have been trying to get my head around horsepower and torque in referance to marine engines and could use some help. I was looking at two data sheets with curves, one on the Cummins 4BT 150 and the other the Cummina 4BTA 250. Data Source: http://sbmar.com/Engines/Cummins_PerformanceCurvesMechanica...

Major

Thats a great looking model. Is it made of wood or some other material? Id really like to see how he cast that bertram logo and the side intakes. I bet that was a challenge.

Major

I think im going to end up making the plug from plaster after doing more reading. That seems like the best way for me to make the plug and seal it before glassing it to make the mold. Do you think i should make it more like 3' long to get a more realistic model to try things on? That will kill the s...

Major

Yea I know what you mean about the jet drives. I've never drove anything with them but seeing people in the little jet boats makes them look a little like they are hard to control. It seems like the reverse thrust with them would almost be negated by the back of the boat too. They always seemed a li...

Major

Im thinking about making a very scaled down version of my 28's hull to try out a propulsion idea I thought of. Money wont allow a full scale test so I thought I may try my hand at a scale model. If i can get a good master ill make a mold from it. I dont want to divulge my idea quite yet but wanted t...

Major

I was looking over this and thought some of you may find it interesting. It mentions Bertrams start out with the wood racing hull and making a mold of it for the 31. The article was on a transition from wood to fiberglass.

http://www.proboat.com/articles/134-wood-to-glass.html

Major

Any updates?

Major

Ive always wanted to build a scale model of the 28 bertram. I wouldnt even know where to start with getting the hull shape right though. Having some machine tool training with a touch of perfectionist i would kill myself with the details and over measuring. Its good to see people are still taking th...

Major

Good luck with the new cam. Im pulling for you. You're on your way to being the resident 4BT expert after getting these engines in the boat and rebuilding them. As much as i know about mine i would still be thinking OH S*** what was that! So your ahead of the game and on your way with a solution. Ke...

Major

Matt, Your going to have a new boat after all this. Its looking great. Can you give us any details on how you removed the deck and floor liner while still keeping it intact? I assume you just cut the liner above the v berth out. Ive got to do a ton of work on ours so i may as well see whats involved...

Major

Thanks for the info. I just wanted to be sure i had things squared away and didnt get any surprises whenever we moved the boat. I bet that does create a mess and only gets worse if they have a tailgater. Ive never seen an impact in person but we have a old railroad bridge here i would dare pull anyt...

Major

I have yet another question for all of you. The front deck and maybe the flybridge floor are making some noises when i walk on them and feel a little soft in certain areas. So apparently there is some kind of damage. We have had the flybridge off for years while the boat just sat on the trailer. Its...

Major

Wow thats a relief. I was reading between the lines and hoping it wasnt sold if you didnt want it to be that is. As expected all your work looks great and that wood choice was a good one. It turned out really nice looking. I do have to say your on top of it with te clean details. As for my spray rai...

Major

For paint? :| Did you glass in a spray rail along the waterline? It looks like something is there but i couldnt quite make it out.

Major

Yall have some great looking boats and i agree the pulpits do look good. I didnt think about the slip fees though. Right now that isnt an issue but who knows when it will be. Seems kind of like stretching the rule to include the rear platform and the pulpit. Too bad they dont just count wetted surfa...

Major

Sitting here thinking again and i was curious what all of your thoughts are on bow pulpits. Are they really a helpful addon or are they a hazard? Im also curious why they arnt profiled with a V shape at all on the bottom. I know i havent been in real rough seas but ive seen the bow go under or come ...

Major

Glad to hear your 28 with the 4BT's worked out so good. Those were much better numbers than i was expecting and thats always great news. Now ill have to get on the ball and get mine up and running.

So where are the pictures? :wink:

Major

I just looked over your site and man it all looks great. I have to admit i thought the cash was real. I guess thats what i get for being young and stupid. :-D

Anyway that is some unbelievable work.

Major

Yea the coosa seems a little more involved than i thought so thanks for the heads up on working with it. Ill definalty be careful with the dust.

IRGuy: I sent a PM back to you last week so it must have gotten lost somehow. Ill resend it. Ill take whatever you dont think you will use.

Major

IRGuy: I sent a reply to your PM and thanks for the offer.

Major

Bob H.: I just sent you a PM. IRGuy: I should be able to work with a 12x12 piece and i could use the scraps from that to test some ideas for the boat as well. If you have already used some of the coosa board can you tell me which models may be the better ones to see about? I hate to ask for a few sa...

Major

Ive thought about making a fiberglass rear stock for an AK and thought about using the coosa board from all ive read on here. I was looking for a good, strong core to make it lighter and i could glass over with a few layers of glass. I dont know which one i would use yet. My issue is i dont see anyo...

Major

Take a look back up at the second part of my first post. That should help out with your question. It basically says that the turbo gets hot and that combined with the vibration can cause the filter to fall off. The tube helps prevent that. Have you looked into the intakes capacity? I didnt think abo...

Major

I found that info over at boat diesel i think. Let me see if i can find it and ill post it on here. Found it and Tony Athens (the OP) is the one to thank. " k&n makes great replacements. Typical #'s we use are the RU 2820 or RE 0930 for the 4B/4bt/4btA and 6B/BT. These w/ fit the 3" turbo and may ne...

Major

One thing that doesnt work from my experience are the WHY traps. Its for wasps hornets and yellow jackets and they dont go to it for who knows why. Guess they dont like the bait that comes with it. If they are nesting in the same spots some sprays have something in them to keep them away. My problem...

Major

I e-mailed them about the prop pockets and they sent the price list. Send me an e-mail or let me know how to attach them if anyone wants to look it over. I dont know what the part you want would be called but it may be on there.

Major

Thanks for the info on the 30. I guess my thoughts on it being a wierd duck were well founded. Do any of you have a copy of the Cummins 6BT Installation diagram with all the dimensions on it? I see one over at boat diesel but havent sent a membership in to be able to download it. For some reason all...

Major

I also have to chime in on mcmaster carr. Every time ive ordered from them ive had the order in 1 or 2 days with standard shipping. They have been great in my experience. I just wish they would let a small guy like me have a catalog.

Major

Man.... and i was just reading back over my thread on removing the trailer from our 28 today. Anyone know who may sell some good used stands for the side of a 28 or is used a screw up on this item?

Major

Great looking boat. Yall definatly always do great looking work. I like how its simple looking but has some great details.

What window material and % tint did you use on the windows?

Major

Do any of you have some measurements of the 31's engine box inside dimensions? I have seen a few run the Cummind 6BT's and was curious what it size it took to get them to fit. With that being a cheaper engine ive thought about moving the bulkhead forward some if my 28's engine box was close. A coupl...

Major

First of all CaptPatrick you should really add a paypal donation link. Thanks for the great explination as usual. Those figures and info will really help in buying and building the parts. I wouldnt mind coming to a fiberglassing or boat constructing class from a few of yall on here if you ever had a...

Major

The dock is finally failing and needs to be replaced. The professionals price was $15k so we are looking into doing it ourselves. (dun dun duuun :twisted: ) Have any of you made a floating dock and have any tips or suppliers to pass on? Our old one had the old exposed foam thats a pretty developed s...

Major

I was reading through a past month Professional Boat Builder magazine and saw an interesting little article. They were discussing the possable benefits of a dimpled bottom on a boat. By dimpled i mean the golfball pattern. In air its proven that it does lower the resistance but the interesting thing...

Major

I was looking through the boat classifieds as ushuall and found some interesting boats and features. So as yall know by now that leads to questions. The first thing i noticed was a 30' bertram moppie. I didnt even know it existed and see that its built on a 31 hull from what a couple ads said. I als...

bertram31.com

Search found 93 matches

Re: the 28 is coming together

Re: that time again

Re: Firearms question

Re: Fiberglass Window Frames

Fiberglass Window Frames

Re: Aluminum Windshield Frame

Re: We have some color!

Re: Question for the cnc machinists or shop owners

Engine Mounts

Horsepower and Torque

Scale Bertram Hull

Short article on ProBoat

Soft Deck

Bow Pulpit

Small project supply sources

31 Bertram engine box size

Building a Floating Dock?

Dimpled boat bottom

Browsing the classifieds