Utility Gunwale

Outboard designs up to 14'

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largej
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Utility Gunwale

Postby largej » Tue Nov 03, 2015 7:35 am

Hi Folks,
I posted this in the Lumber section and got good advice on not trying to bend but use multiple 1/4 laminations. But I would like to ask more broadly; looking for advise on installing Mahogany gunwales to match my spray rails. I know how much work it was to shape and install the 1-1/2 X1-1/4 spray rails. It was worth the effort but makes me re-think about the process for the gunwale.
I plan to use 1-1/2 X3/4 Mahogany. I was thinking about shaping it now before I install the bow decking. I could just set-up a frame on a 4x8 sheet of plywood and slowly bend the wood like I did the spray rails. Then use the boat's sheer as the final "jig" because there is a twist to sheer that can only be shaped in place.
The plan was to finish the bow decking, I want to fiberglass, prime/paint and then install the gunwales and finish them to match the spray rails - natural. I thought about installing the decking and "flatten" the junction of the decking and side then add the gunwale. This will eliminate the twist but I loose the ability to clamp and shape gunwale to the sheer.
Any suggestions; past experiences/practices would be greatly appreciated. Thanks - Jim
Here is a picture of where I am at:
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Bill Edmundson
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Re: Utility Gunwale

Postby Bill Edmundson » Tue Nov 03, 2015 8:04 am

Jim

I think this is kind of what you're thinking. I set up temporary post from the coaming. I put plastic tape on the post so the epoxy wouldn't stick. I did my laminating in place. Same sort of idea.

Bill
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largej
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Re: Utility Gunwale

Postby largej » Fri Nov 06, 2015 9:25 am

Thanks Bill - I was thinking if I flatten - make the joint at decking and side junction vertical - I can take away the twist at the bow and just deal with the bend. Not sure if I want the gunwale to follow the sheer. Does that make sense?

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hoodman
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Re: Utility Gunwale

Postby hoodman » Fri Nov 06, 2015 9:54 am

Sounds like your talking about a rub rail? Or are they the same thing?

largej
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Re: Utility Gunwale

Postby largej » Mon Nov 09, 2015 3:09 pm

Yes I believe so. At least that is the intended purpose of the mahogany strip in this case. Protection and aesthetics. Getting good info but still not sure what way to go.

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hoodman
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Re: Utility Gunwale

Postby hoodman » Mon Nov 09, 2015 6:21 pm

I think the best aesthetically would be to fair a vertical mounting for the rub rail.

largej
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Re: Utility Gunwale

Postby largej » Tue Nov 10, 2015 8:54 am

Yes, that is what I am thinking and leaning. I just have to decide the height. Can't be too high because I don't want to cut into the sides - maybe an inch high; I guess tall would be a better descriptor and 1/2 thick. I could use 2 1/4 strips and laminate. This would require vertically flattening the sides 3/4 of an inch and the decking 1/4 roughly speaking.
I think I am getting closer to a solution.
Thanks for the suggestion.
Jim

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hoodman
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Re: Utility Gunwale

Postby hoodman » Tue Nov 10, 2015 12:28 pm

Hey, Jim, with only 1/2 thick material it should take the bend nicely without having to laminate. The sheers on my boat are two thicknesses of 5/8 material and they bent in just fine. 1/2 inch will bend even easier especially if you are not introducing a twist.

largej
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Re: Utility Gunwale

Postby largej » Fri Nov 13, 2015 1:48 pm

Hi Matt,
That is really helpful. Now I think I have a plan that makes sense and is really doable. I feel more relaxed about that phase! Thanks again for the feedback and peace of mind.
Jim

largej
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Re: Utility Gunwale

Postby largej » Tue Dec 22, 2015 9:27 am

Folks - This project just got serious and I am now committed to getting the boat out of the basement.

I picked this up off Craig's List. 1969 20hp Johnson Sea Horse. Looks in good shape, well maintained. I have to start leaning mechanic skills now. Getting the Service Manual. Building stand and will test over the holidays. Merry Christmas!
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largej
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Re: Utility Gunwale

Postby largej » Wed Mar 23, 2016 7:41 am

Hi Folks,
This post might be out of place but thought I would continue on my thread for the Utility build. Gunwale done thanks in part to your suggestions.
I found a 1969 20 hp Johnson on Craig's List for $300 and plan on using it on the my boat. I know the specs call for a smaller outboard but this is what I have and want to know if I should beef-up the transom.
Here is a pic of what I have now - 1-1/2 transom with 1/2 knees. Maybe a knee in the middle extending up above the existing knees? I have about 5 inches before I have to account for the motor mount clamps.
Any thoughts? I want to add before I finish painting. (PVC - pathway under floorboards for future electrical wiring or speedometer tube)
Thanks - Jim
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vupilot
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Re: Utility Gunwale

Postby vupilot » Thu Mar 24, 2016 6:04 am

Those old motors were fairly light, I wouldnt worry too much except if you trailer it in place. I feel rough roads are harder on it than anything on the water. But I do think you would be happier with the performance of something between 6-10hp. I had a 15 on mine at first and switched to 8hp.

largej
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Re: Utility Gunwale

Postby largej » Fri Mar 25, 2016 5:29 am

Thanks - I appreciate your input and experience. My 1st build was the Tiny Titan and the plan was to share the same motor for both boats until I figure out long range what I will do with them. I am thinking the 20hp on the Tiny Titan will be quite the ride.


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