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Rabu, 20 April 2016

Design lineage part II

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Earlier, I mentioned a book by Frank Rosenow, and the obvious design influences derived from the Swedish eka working boat. There is a further bit of design heritage in the Passagemaker dinghy that should be mentioned. The famed small boat designer Sir Jack Holt also had his role influencing the design of the Passagemaker with his Mirror racing dinghy. This role is acknowledged by the Passagemaker designer himself, John C. Harris, who says, "Both the Mirror and the Passagemaker are prams with gunter-sloop rigs, which is sort of my wink-and-nod to Holt." Indeed, the economical gunter rig is found in both boats, combining a fast, weatherly Marconi-style rig with the convenient short and transportable spars of a gaff rig. But beyond that, the serious racing purpose of the Mirror is apparent: the design sports a finer bow, a planing hull, and the more complex and versatile running rigging of a class racer. Many mirrors are also equipped with hiking straps and trapeze wires for hard sailing, in contrast to the simpler, all-purpose configuration of the Passagemaker. Large numbers of Mirrors exist today, and Mirror clubs are active in England. There, the fine art of dinghy sailing is refined, and subtle points of rig tuning discussed. Passagemaker builders have Jack Holts Mirror dinghy to thank as another design influence.

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Minggu, 06 Maret 2016

Sanding part II

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Power corrupts, and absolute power finishes the job quickly. The sanding cavalry arrived today in the form of a Ryobi belt sander. My lesson, as it turns out, is not only to avoid cheap tools, but also to use the right tool for the job. I thought I could get by with a "quarter-sheet palm orbital" sander. But these are smaller machines, more suitable for finishing and light sanding. What I really needed was a 3" x 18" belt sander to make quick work of sanding both sides of 12-foot long strakes. So a visit to the local home super store equipped me with both a belt sander and a Black & Decker version of the quarter sheet sander that I burned up on Wednesday. The belt sander did the job 100 times faster than the little orbital sander was doing before it quit. All it took from me was to grasp the subtleties of handling the beast. It removed material very quickly, and a deft hand was needed to avoid gouging or sanding completely through a layer of the mahogany plywood. Fortunately, I was able to quickly find the right balance of pressure between the front and rear handles in order to smooth the rough epoxy surface. In a little over an hour, both sides of all six strakes were brought to readiness for a second coat of epoxy, tomorrows task. Total hours 8.00.

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Kamis, 25 Februari 2016

Seam sealing part II

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I finished up the last of the seams that didnt get done yesterday before the football game. I neednt have hurried; the Bears lost. In fact, the game was so disappointing that in the second half, we put in a rental movie, Red, and enjoyed it very much. So today I finished up the first epoxy injection of the remaining joints, including the #1 panels/bottom panel joints- the hardest to reach and to get epoxy into. Tomorrow I can start removing the hundreds of stitches that have been holding the hull together until now. Total hours, 35.25.

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Selasa, 23 Februari 2016

Boatbuilding Lark Scow Part 1

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Other posts on the Lark scow.


Peter Gilbert of the Erieau Lark fleet in Canada has started a new Lark scow (named Pinky Too, his Dad built Pinky 2 and Pinky 3) using the Kerr plans. He sends along some photos. The Kerr plans follow the original C.G. Davis plans in using a lot of frames. Instead of sawn frames, Peter has laminated the arc sections. He is planking the bottom of the Lark with plywood but with a hi-tech twist; he is using 3mm plywood with a carbon fiber sheathing (I wonder how this will square with the Erieau Y.C fleet as Peters construction may possibly result in a Lark considerably lighter than the current boats.)

I like how these builders determine fairness using a full glass of beer as a sight-line.




The solid timber side planks hold everything together before the bottom and deck goes on.











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