Hybird MF14

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Chenier
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Re: Hybird MF14

Post by Chenier »

About 5 inches of the wooden mast is trimmed to fit inside the aluminum one. That was done by hand sanding and chiseling the shoulder. I could have done it while I had the lathe set up but I didn't know the inside diameter of the Sunfish mast.

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Here are the two parts of the mast assembled. A screw keeps the wood and aluminum parts from going their separate ways.

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The assembly will come apart soon so I can varnish the wooden part. That'll happen after I finish the boom & gaff.



Chenier
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Re: Hybird MF14

Post by Chenier »

The boom and gaff will be 1.5-inch diameter Sitka Spruce by 13 feet 8 inches long, the same dimensions as a Sunfish rig.

My supplier only had 8-foot lengths, but was kind enough to pre-cut scarf joints for me.

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Earlier in the project I came home from the box store with a 10-foot section of Unistrut. It makes a decent straightedge when carving plywood panels lengthwise with the circular saw.

In this case the strut was helpful getting the spar-building table straight and shimmed level. With a level table as my horizontal reference, the Unistrut then became the longitudinal reference for the scarf joints. Wrapped it in wax paper so I wouldn't epoxy the spars to the strut.

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Finished scarf joints

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Chenier
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Re: Hybird MF14

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Making the spars is the same drill as the mast: knock off the corners, then knock off the corners again and again.

Here's the first corner planed off.

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I got about two feet into it when I had one of those "this doesn't look right" moments. After a suitable period of measuring and head scratching I re-did the layout. :doh: Turns out some knothead had done the calculations for a hexagon instead of an octagon. :roll: Hence the double lines on the unplaned corners.

Halfway there:

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I gave the spars catchy names, "A" and "B", so I could tell them apart.

Chenier
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Re: Hybird MF14

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Octagon

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16 Sides

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32 Sides

Chenier
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Re: Hybird MF14

Post by Chenier »

Boom!

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cape man
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Re: Hybird MF14

Post by cape man »

Very nice.
The world always seems brighter when you've just made something that wasn't there before - Neil Gaiman

Jeff
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Re: Hybird MF14

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Nice work!! Jeff

Chenier
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Re: Hybird MF14

Post by Chenier »

I've finished shaping and sanding the spars. They taper at the leach (outer) end, just like the original wooden Sunfish spars.

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The ends will be used to hold 'em while they get varnished. I'll cut and round off the ends after varnishing the body of the spar.

But before I clean the shop up for varnishing, I'll make the blocks and linked eyes that go on the booms.

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