Crawford's Tolman Widebody blog


By fishtrap777 - Posted on 26 November 2006

Greetings fellow boat builders. Welcome to the blog for Jim Crawford's Tolman Wide Body Skiff.

I own a rather extensive wood working shop that includes among other machines, a 3-axis CNC router. I elected to make my Wide Body kit using this tool. The first thing to do (after buying the 'Tolman Alaska Skiff' book) was to create a virtual 3D 23' Tolman Skiff in CAD. Once the boat was built on the computer, I was then able to extract the variuos parts, nest them on a virtual sheet of plywood, generate maching code for the parts, and then actually cut the real deal wood parts. This technology allowed for parts, such as the bowstem, shelfs, transom, and front inner plates to be pre-beveled.

Will all this technology make my Tolman better than the next guys? No. It hopfully will be a Tolman half a nice as some of the "old school built" boats that are alreay well documented. The bar is pretty high amoung Tolmans right now. It's just a different way of going about getting the same result. Thus qualified, spare me the flames please. ;^)

The scarfs are a bit different from what the book calls out for. They could be called a sine wave scarf.
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There is quite a debate going on in some forums as to weather this scarf is stronger that a flat scarf. I don't know. I just think they look super custom, and they are just as simple to make on a CNC machine.
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I use the pre drilled stiching holes for alighning the panels for joining. These are some of the chine parts.
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Melemine works incredably well for glue up. Epoxy won't stick to it, and it leaves a very smooth finish. Here's a melemine sandwich.
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There was enough 1/4" ply left over from the front plates to make a 9' Garvey tender for the Tolman.
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It will serve as my bass fishing skiff as a 23' wheel house boat is a bit tough to navigate the shoreline while workin' the rubber worm. The boat should be very light and plane with a 5 ~ 6hp motor. This motor will double as a kicker for offshore fishing.

More updates will follow soon.

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CAD.jpg189.37 KB
CADsm.jpg9.57 KB
Chine Scarf.jpg110.81 KB
Cut Sine ave Scarf.jpg117.74 KB
Full Sine Scarf.jpg109.92 KB
Garvey Scarf.jpg92.37 KB
Melamine sandwich.jpg104.26 KB
Garvey.jpg56.74 KB

Hi Jim, you were 99% of the way there. Hit the edit tab and you'll see the code I typed in to make the image show up. I also scaled your image to 350 pixels and created a link to the full-size one so it would look nicer. Your widebody drawing looks great. Makes me want to build one. -- Paul

Jim,

Where do you get the melemine product? Is it something that lumber yards carry, or specialty suppliers? I think I would like to get some to keep around for scarfing.

I see you did your scarf with clamps. Any ideas for not using screws to hold the scarf together on a 4' wide scarf?

I like your imaging of the boats!

Joe

Joe... You can find melamine at most home improvement stores.

As far as clamping, I've cut the scarfs to have about .02" of space in between. The idea being that a thin layer of epoxy in the scarf is desirable for a strong joint. Therefore alot of clamping pressure isn't needed. It should be enough to wieght the melamine sandwich with heavy objects on a flat surface.

Jim Crawford
San Diego, CA



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