Narfi's Scratch Built Zenith 750 Super Duty

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narfi

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Feb 23, 2016
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Squirrel!!!!!

Decided to turn Landon's canoe into a sailing trimaran without buying any plans(or having ever sailed, or ever even seen a sailboat up close with an interest in operation)...... o_O

Made a mast and boom from 1x4s with 12oz glass in and out. I think they are way overkill and heavy, though lighter than if solid... As much time as I spent doing it I wish I had bought foam and made them lighter while learning more about it. Plenty good for fun playing around experiment though so all good :)

Still need to fair the mast and boom, paint them and cut the track groove.

Modeled the hulls in solidworks and cut the panels and bulkheads from 1/8" hydrotek (marine grade mereniti plywood) and will tape the seams in and out with 6oz biax and finish the outside with one layer of 6oz woven.

Hulls are 1.5 sheets of plywood long so roughly 12ft. Connecting beams will be 12ft long rectangle boxes from 1x4s (same core as the mast)
The Canoe is 14ft long, so with all 3 hulls connected it will be roughly 14ft long and 12ft wide.

Self teaching myself solidworks made some beginner errors but the panels still fit nicely together so for building stuff that probably can't kill me I am happy with the exercise.

Maybe optimistic but hoping to be done in a month or so...... Landon told me it has to be done before 4th of July so he can show it off :)

Maybe that will get me a little closer to having some finished 750SD plans instead of a piece at a time.... or I will just resume doing a piece at a time which I still enjoy immensely :)

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BJC

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97FL, Florida, USA
Nice project. I built the mast (hollow wood, sort of like your’s) without power tools, circa 1956, for a sailboat that my father and I built.

Your son will have fond memories of being with / working with you for a lifetime. I know.


BJC
 

narfi

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Well I should be back on the Zenith in the next week or so (hopefully.....) we are near the end of the rabbit hole we fell down,

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I had never sailed before or even really seen sailboats up close other than one walk through the docks at Seward this spring, and so our first time was on a self designed boat... pretty cool it worked!
Very stable, I am still amazed at how stable it is. Canoe bolted to the middle is 14ft (we built it 4-5 years ago) and the outriggers are 12ft and the beams are 12ft, mast is 23ft(longer than needed in case we need to upgrade sails...., sail is off ebay from a 420 class dinghy. I tried standing on one outrigger and rocking it as hard as I could, could only get it about 2/3rds submerged.
After the second test run the forestay and shrouds were loose, too loose for the main lake which was rougher, the mast was swaying quite a bit, it has a lot of leverage o.0, so I tightened them a LOT. The yoke and cable steering system is too stiff, so I am building a double tiller system with a cross-over bar tying them together.
 

narfi

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Joined
Feb 23, 2016
Messages
1,054
Location
Alaska
Sailed, modified, broke, and repaired the sailboat a while. Evenings are getting cooler so Wednesday night I sanded all the epoxy drips off the work table and dug out some zenith parts.


Last night laid out some steel tube for straight support jigs. (Table is on dirt and uneven after a few freeze thaw melt mud cycles) good practice to have some straight steel tubes or beams to clamp to anyways.

Clamp the horizontal stabilizer spars and ribs in place and started going through all my old emails with Roger for dimensions. Drilled pilot holes for the center three ribs and clecoed in place. Need to find or make the angle tab for the outer ones and get them clecoed in place.

Thinking about the skin. .020 with a 1 1/4" radius leading edge. The pipe I had used for vacume forming the rudder isn't long enough for this 10ft long skin. Will need to find a longer pipe which may start getting too flexible or figure out a different method.

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