Lee's Monaco utility build

Designs for inboard or outboard power

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denbrlr
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Re: Lee's Monaco utility build

Post by denbrlr » Mon Aug 12, 2019 7:08 pm

Thank you for the idea about disposable measuring cups. Not sure why I never thought of that :)

I am about to start building the motor stringers. Originally, I was going to use 16 foot douglas fir 2x6 boards but I couldn't find any locally that had the proper moisture content. I am going make them out of two lams of Honduran mahogany 4/4 stock. The motor stringers need to be a little about 15 1/2 feet long but my lumber is only eight feet long so the pieces will also need to be joined with staggered joints. I probably should use scarf joints but I am not sure of my ability to create good scarf joints. My other option is to use a butt joints. Thoughts?

TomB
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Re: Lee's Monaco utility build

Post by TomB » Tue Aug 13, 2019 5:55 am

Staggered scarf joints! The boat gets built off the stringers and they unify everything in the boat, so build them strong. Take your time, you'll make some nice scarfs and wonder why you doubted yourself.

Tom

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Bill Edmundson
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Re: Lee's Monaco utility build

Post by Bill Edmundson » Tue Aug 13, 2019 7:23 am

On my Tahoe I built them up from 4/4 staggered joints. My cuts are 60* by 45*. That was the best I could do at the time. None of the joints are under the engine.

Tom is right. This is the first critical part of the boat. Take your time. Everything lines up off the stringers. They are one of the few things that you can measure from. In the end, I don't think they take that much of the load. The shape and unity of the hull is the real strength.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
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Sarnian
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Re: Lee's Monaco utility build

Post by Sarnian » Tue Aug 13, 2019 8:09 am

A good scarf is a thing of beauty and one you will be proud of.....they're not so bad to do on lumber, even completely by hand. If you ever watch SampsonBoatCo's restoration of TallyHo on youtube, or AcornToArabella on youtube you'll see some beautiful scarfs on massive lumber. If you don't watch those, you should stop reading this and go watch them...really entertaining boatbuilding series.

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hoodman
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Re: Lee's Monaco utility build

Post by hoodman » Tue Aug 13, 2019 11:31 am

I cut the scarf joints on my keel by hand. There are pictures of the process somewhere in my build thread.
Matt

Building a Geronimo......!
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Jimbob
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Re: Lee's Monaco utility build

Post by Jimbob » Tue Aug 13, 2019 11:48 am

You will want to use scarf joints. You will want to also use them when you get to making the battens as they are even longer. Glen-L has a detailed page on scarf joints. I made a jig so that I could cut the scarf joints with my router. The ratio was somewhere between 1:8 and 1:12 for the scarf angle. Pics below:
Jim
Attachments
P1010061.JPG
The router is attached to a clear plastic plate that rides on the angled jig.
P1010060.JPG
A board clamped into place ready to cut the joint.
Jim Neeley
Building a Barrelback in Sacramento, CA
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Mark-NJ
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Re: Lee's Monaco utility build

Post by Mark-NJ » Tue Aug 13, 2019 4:52 pm

denbrlr wrote:
Mon Aug 12, 2019 7:08 pm
I am going make them out of two lams of Honduran mahogany 4/4 stock.
Really?

Swietenia macrophylla is darn near unavailable, and what little you can find is protected by CITES trade controls.

Before you begin the work...or even buy the wood...make absolute certain you know what species you're working with...glues you choose will matter. Obviously, I don't know what you're sourcing, but I really doubt it's genuine Honduras Mahog.

Image

denbrlr
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Re: Lee's Monaco utility build

Post by denbrlr » Tue Aug 13, 2019 7:43 pm

Thank you for the responses everyone. Scarf joints it is. I figured if I made scarf joint I would use a jig and my router so I guess that is what I will do. I will take my time and do my best...

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mrintense
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Re: Lee's Monaco utility build

Post by mrintense » Fri Aug 16, 2019 4:29 pm

I also used the router and angled jig. It works fine. Really as far as scarf joints go, it's the glue up that actually more work because you want to make sure the board is straight through the scarf joint. When I made my chines and sheers (21 plus feet long), I used cinder blocks to hold them up and then clamped to the cinder blocks.

IMG_20140330_110812.jpg
IMG_20140330_103900.jpg
Carl
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denbrlr
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Re: Lee's Monaco utility build

Post by denbrlr » Fri Aug 16, 2019 4:51 pm

Carl,

Yes, I wondered if the glue up would be tricky. I guess I will sort that out when the time comes. Thank you for the tip.

Lee

denbrlr
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Re: Lee's Monaco utility build

Post by denbrlr » Thu Aug 29, 2019 7:18 pm

I made two jigs for my table saw and used them to make scarf cuts. They hold the lumber at an angle so you make one half of the scarf cut with one jig and then flip it over and make the second half of the cut with the other jig. It takes some fine tuning but it works great. Here are some pictures for one of the scarf cuts I made. This is for one of my motor stringer laminations.

Lee
Attachments
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IMG_20190827_191154.JPG
IMG_20190827_191332.JPG
Last edited by denbrlr on Fri Aug 30, 2019 6:54 pm, edited 1 time in total.

denbrlr
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Re: Lee's Monaco utility build

Post by denbrlr » Thu Aug 29, 2019 7:23 pm

Here are some more pictures. The last picture shows the pieces that will become one of the motor stringers.

Lee
Attachments
IMG_20190827_185326.JPG
IMG_20190827_185900.JPG
IMG_20190829_210039.JPG

footer
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Re: Lee's Monaco utility build

Post by footer » Fri Aug 30, 2019 3:02 am

Nice job on the jig and thanks for sharing the pics. I made a similar jig for my battens.

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mrintense
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Re: Lee's Monaco utility build

Post by mrintense » Fri Aug 30, 2019 11:23 am

Another cool solution. Thanks for sharing Lee.
Carl
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Crafting a classically styled Vera Cruise

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denbrlr
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Re: Lee's Monaco utility build

Post by denbrlr » Fri Aug 30, 2019 6:53 pm

Thank you and I am glad to share. I occasionally have a good idea :?

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