69 Woodson Tri-hull with 68 Johnson 55hp

gm280

Supreme Mariner
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Jun 26, 2011
Messages
14,605
Early update, i was shooting for a weekly update, but got some extra help yesterday. Managed to get the cap moved off the boat with the help of my Brother in law and my nephew, great bunch of guys. Ill get a stand fabbed up for the cap and try cutting the inner transom glass and removing the remainder of the deck.

For my first question to the community, is it better to remove the transom and stringers all at once or replace them piece by piece. My sensible side says to complete the transom repair first then stringers, one at a time then deck. Seems like most threads i have read, you guys just gut the whole dang thing and start figuring it from there.

If it is any consolation, I have seen worst...much worst.

Before you get too involved, you seriously need to take a lot of measurements NOW! I used a graph paper system for that. Measure across the hull (beam if you will) from the very back (transom) and measure at some intervals all the way to the front (bow) and layout those measurements on some sketched diagram of your boat. I measured about every foot to capture the arch of the sides. Because it would be really sad (and you wouldn't be the first) to find out after all the work, that your cap won't fit back in place anymore.

Any side splaying out will stop the cap from fitting back in place. So your cradle really needs to keep the sides in check for that reason.

As you start grinding the old fiberglass out in prep for new transom and stringers, you will start to see how flimsy the sides actually are. That is why you build the cradle to hold them in their original place as you rebuild the internals.

As to your question about how to do the rebuild of the structure, I personally would gut the entire hull including the transom and stringers first. Then grind the hull in prep to replace them. I put the new transom back and then the stringers. And depending how your boat was made, the stringer probably tie into the transom. So a new transom will make the stringer replacement solid as a rock.

Keep up the great work and questions. And make sure you post updated picture for us to see and offer ideas and help. :thumb:
 

Hab

Petty Officer 2nd Class
Joined
Jul 4, 2017
Messages
158
If it is any consolation, I have seen worst...much worst.

Before you get too involved, you seriously need to take a lot of measurements NOW! I used a graph paper system for that. Measure across the hull (beam if you will) from the very back (transom) and measure at some intervals all the way to the front (bow) and layout those measurements on some sketched diagram of your boat. I measured about every foot to capture the arch of the sides. Because it would be really sad (and you wouldn't be the first) to find out after all the work, that your cap won't fit back in place anymore.

Any side splaying out will stop the cap from fitting back in place. So your cradle really needs to keep the sides in check for that reason.

As you start grinding the old fiberglass out in prep for new transom and stringers, you will start to see how flimsy the sides actually are. That is why you build the cradle to hold them in their original place as you rebuild the internals.

As to your question about how to do the rebuild of the structure, I personally would gut the entire hull including the transom and stringers first. Then grind the hull in prep to replace them. I put the new transom back and then the stringers. And depending how your boat was made, the stringer probably tie into the transom. So a new transom will make the stringer replacement solid as a rock.

Keep up the great work and questions. And make sure you post updated picture for us to see and offer ideas and help. :thumb:

Allright GM, thanks for the tips, I went ahead and made a quick sketch with measurements at least for the cross dimensions at each 1 ft. I have the cap sitting right behind the boat and will double check the measurements to the inside of the cap lip. I added some side bracing to the trailer at least for the back half where the boat flattens out to prevent side splay before i removed the cap. the plan at this point is to lower the trailer as much as possible and level the boat on the trailer according to the current stringers or really the theoretical deck. Im hoping that the upper lip of the hull where it meets the cap will also be level between port and starboard at each ft increment. that will give me two points of measurement to keep straight when i start putting junk back in.

I debated the cradle idea, but honestly i dont have space for a trailer, cap, and hull/cradle. I opted for a half-a** trailer-cradle, partly to save space, partly to keep it mobile, and partly because i had the material on hand to weld up the side supports.

I have no intention of making this a high end, high quality, craftsmanship exhibition like most of you fine fellows have done. I'm shooting for a strong, safe fishing boat, with a new coat of paint. Should I manage to complete this project, ill have the experience to take on a better boat, maybe and I/O or nice fish n ski.

I did manage to remove the remaining deck wood from under the bow section, it came out complete enough to use as a template assuming i don't warp the dog snot out the thing during decon/recon. i also peeled off the inner skin of the transom. The inner section of the wood seemed fairly complete albeit very dark with mold and water was soon oozing out. the outer half of the transom is nearly completely decomposed.

Does anyone know if there is a correlation between transom thickness and size of outboard you can hang off the boat. My transom is 1.5" thick inner glass to outer gel coat. I think the sticker says its rated for 60 hp and 900lbs. Im just wondering if i make the transom thicker and modify the splash well if i could put on a bigger motor say an 80-90hp. Ill get to looking for that later, i was just hoping someone would know off hand.
 

Hab

Petty Officer 2nd Class
Joined
Jul 4, 2017
Messages
158
The few pics
Sketch, front deck removed and transom nudes.
sketch.jpg
 

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gm280

Supreme Mariner
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Jun 26, 2011
Messages
14,605
The few pics
Sketch, front deck removed and transom nudes.

Absolutely perfect. And you now know the reason for those measurements. That's the best part. It is all too easy to not even think about the boat getting out of shape and then real problems happen when it is time to re-cap the hull.

You are on your way now and making good time. It usually goes fast during this stage. It slows down when you start to grind the hull for new construction to go in. And if you haven't already, you seriously need three, no make that four things to protect YOU. Good goggles, a 3M type respirator (not a dust mast, but a good 3M 6000, or 7000 series mask with replacable filters), a Tyvek full suit (they are easy to come by at most Lowe's type places) and last a good pair of gloves. It will protect you when you start grinding.

Keep posting your progress. Looking good... :thumb:
 

oldrem

Commander
Joined
Nov 7, 2013
Messages
2,002
1-1/2" thickness is pretty standard for most outboards. You may want to rethink exceeding plate limits on the motor size. Insurance companies and in some states water patrol would have some serious issues with that.
 

Hab

Petty Officer 2nd Class
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Jul 4, 2017
Messages
158
1-1/2" thickness is pretty standard for most outboards. You may want to rethink exceeding plate limits on the motor size. Insurance companies and in some states water patrol would have some serious issues with that.

Dang Rem, you just ruined my day. The last thing I wanted to think about as a boat owner was buying the communist insurance. yeah, I know its irresponsible not to insure everyone else against my own negligence and stupidity, but Dang it, now i have to go learn about boat insurance.
 

sphelps

Supreme Mariner
Joined
Nov 16, 2011
Messages
11,475
Yep and with the EPA now days insurance on oil spills and such is a good idea . Just in case she ever goes down ,hopefully not , they can stick a nice fine on you ...
 

Hab

Petty Officer 2nd Class
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Jul 4, 2017
Messages
158
Hmmmm, so Im starting to track down Resin and cloth and the various compounds and fluids ill eventually need. I have a local supplier that carries isophthalic resin. It seems like a better quality of stuff but, Im not so sure its worth the cost yet. I have read some builders say they use the (some company name) 435, but other than that i haven't seem much discussion of the varieties of polyester.

Whats the verdict? is isophthalic best, or is another lower grade of resin suitable and the main difference being total cost on shipping vs local pick up.
 

Hab

Petty Officer 2nd Class
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Jul 4, 2017
Messages
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Yeah...... so....... disregard the last post, lightning struck and i stumbled upon the correct search terms. Seems like i get lucky on this one, I can get the better resin at about the same cost as the lower resin shipped. I guess that's a no-brainier, I double check with scarecrow.
 

gm280

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Jun 26, 2011
Messages
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Yeah...... so....... disregard the last post, lightning struck and i stumbled upon the correct search terms. Seems like i get lucky on this one, I can get the better resin at about the same cost as the lower resin shipped. I guess that's a no-brainier, I double check with scarecrow.

Depending where you live, a lot of boaters on these project forums used 435 laminating resin from US Composites. US Composites even sells the CSM (chopped Strand Matt) and the 1708 bi-axial material that goes along with the polyester resin.

US Composites sells a lot of such supplies and is located in Florida and ships very fast. And since they do sell tons of such boat building supplies, everything you get from them is very fresh and has not set on a shelf for any period of time. And that is important because Polyester Resin and the MEKP ( Methyl ethyl ketone peroxide, the catalyst hardener, that is used with polyester) has a self life. SO you will get very fresh supplies without any worries.

So it really all depends on where you live and have access to, to buy what you need. You will need polyester resin (or Epoxy if that is the way you want to go) and fiberglass materials pending which resin you decide to use. If you go Epoxy Resin, then CSM won't work. If you go Polyester Resin then CSM and 1706 will be your choice. So once you pick, then post questions...
 

Hab

Petty Officer 2nd Class
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Jul 4, 2017
Messages
158
So it really all depends on where you live and have access to, to buy what you need. You will need polyester resin (or Epoxy if that is the way you want to go) and fiberglass materials pending which resin you decide to use. If you go Epoxy Resin, then CSM won't work. If you go Polyester Resin then CSM and 1706 will be your choice. So once you pick, then post questions...

Thanks GM, im definitely going poly on this build. I did read a post today that said the isophthalic poly resin is harder to work with, but that is the only type i can get from a local supplier. I guess ill branch out a few miles in my search, maybe there's a supplier over in OKC or Fayetteville. Im mostly trying to put together a unit cost list from a few vendors and see what the best option is for ordering. I don't mind paying a few dollars more to get my gear from a local supplier, that isn't a chain.
 

Hab

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Jul 4, 2017
Messages
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I stepped boldly beyond the point of no return tonight, and removed the soggy transom and the outer stringers. I did take another round of measurements before i started, mostly so I would have another piece of paper to loose. Then I grabbed what PPE i had on hand, an metal cut off wheel on and angle grinder, a circular saw, hammer and a wonder bar and went to town. The transom was a bit of a bear but the stringers were pretty easy, sliced em off in no time with the cut off. I dont think the stringer wood was glued down at all, and they were probably never really providing any longitudinal support.

I knew the glass was no joke, but foolishly assumed a dust mask and general safety glasses would be sufficient for some minor cutting. Ill defiantly be upgrading my PPE for all remaining demo, and reconstruction.

Im starting to get the idea that boat building is less of a science and more of an imperfect art, like drawing with crayons. You might be able to make a pretty picture, but it was never meant to kept forever.

T1.jpgT2.jpgST1.jpg
 

gm280

Supreme Mariner
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Jun 26, 2011
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Oh yes, the rotted dark colored wood that used to be good. Every boat project has that same look at this point. Yes, you are at the point of no return. But that is a good thing. And if you think about you will now know more about this boat then anybody else. And once completed, you will also have the pride knowing you rebuilt it the right way too.
 

Hab

Petty Officer 2nd Class
Joined
Jul 4, 2017
Messages
158
I went and talked to my fiberglass guy today, really cool guy, got me straightened out about the isophthalic resin and since hes a manufacturer of fiberglass things hes a wealth of knowledge to bounce stuff off of.
Next up for the boat, I should be able to get the center stringer out this weekend and get a start on setting up my grinding tent. With a little luck, ill have a clean hull before Mothers day.
 

sphelps

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Nov 16, 2011
Messages
11,475
Yeah Hab , those paper dust mask are pretty much useless on the demo . A half face respirator will work with safety glasses . I finally pulled the trigger on a full face respirator . Best choice I ever made and worth every penny for glass demo /grinding ..
 

gm280

Supreme Mariner
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Jun 26, 2011
Messages
14,605
Yeah Hab , those paper dust mask are pretty much useless on the demo . A half face respirator will work with safety glasses . I finally pulled the trigger on a full face respirator . Best choice I ever made and worth every penny for glass demo /grinding ..

I have to agree with you on the full face mask. While I have never ever used one, I do know very well that a full face covering setup would be great. Did it fog up on you at all?
 

sphelps

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Nov 16, 2011
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not to bad really . I got the tear away clear covers so when it gets to dirty and scratched up you just put another cover on it ...
 

gm280

Supreme Mariner
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Jun 26, 2011
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14,605
not to bad really . I got the tear away clear covers so when it gets to dirty and scratched up you just put another cover on it ...

Sounds like the type clear covers for my media blaster cabinet. I may have to buy a full face. I could even use it to mow the yard too...
 

Hab

Petty Officer 2nd Class
Joined
Jul 4, 2017
Messages
158
Yeah Hab , those paper dust mask are pretty much useless on the demo . A half face respirator will work with safety glasses . I finally pulled the trigger on a full face respirator . Best choice I ever made and worth every penny for glass demo /grinding ..

Hey sphelps, very cool of you to drop in on my build. I read about you helping out a fellow iboater last night who passed away before he finished his boat. I read and saw how you finished the project with the family. Very cool.
 
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