Pros and cons of steel sailboats - Page 128 - SailNet Community
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post #1271 of 5317 Old 09-27-2013
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Re: Pros and cons of steel sailboats

Sorry for the poor expression. Think in forming the hull the way origami is done complex curves are produced. Think with other construction techniques reproducing the simple or complex curvatures would be more easily done. Would think one could mold off the mirror image from the opposite undamaged side but is still left with the problem of shaping. Wondering how repairs to plate are done to origami or other frameless construction. Steel stretches when dented. For a segment big enough to want to fix or an area where plate thickness has been thinned due to rust you seem to have problem. How is this dealt with ?

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post #1272 of 5317 Old 09-27-2013
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Re: Pros and cons of steel sailboats

"Sorry for the poor expression."

You are forgiven. I know how this is done in a timber boat but I rely on Brent to advise us on how he would do it in one of his boats. You can't exactly plane down the edges in a steel boat.

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post #1273 of 5317 Old 09-27-2013
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Re: Pros and cons of steel sailboats

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Originally Posted by SloopJonB View Post
One of my all time favourites about Alaska was an interview with a barmaid. She was asked about the reputed 12-1 ratio of men to women there and replied "Yes, the odds are good but the goods are odd".
That is a commonly used phrase up here believe it or not. During the first few months up here my wife and I were at a bar near our house and we were all laughing that she was the ONLY one in the bar without a full on long white beard. And believe me, the goods in that bar were very odd (including myself so no fingers pointed).
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post #1274 of 5317 Old 09-27-2013
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Re: Pros and cons of steel sailboats

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. What I don't understand is how this can be done in frameless construction such as origami given plate is formed to shape in basically the same way as "tortured" wood construction.

P.S.- a dog, a baby and a motorcycle helmet. What's not to love. Only thing missing is they should all be in the cockpit of a sail boat.
I have done some "tortured" wood kayak building, or at least I have heard that phrase applied to getting multiple complex bends and shapes out of a single piece of ply. You can see how the deck gets twisted in multiple ways. Is this how Origami steel building works? I always assumed it was more "folds" without those complex convex curves. A bunch of flat surfaces.



My girl in that pic is ready for some AC72 racing in that helmet! Really though we were about to go out for a mountain ride on the snow machine with dogs a chasing. Fun times for sure. Now she is 5 and is already my jib trimmer.
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post #1275 of 5317 Old 09-27-2013
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Re: Pros and cons of steel sailboats

The term that I know is 'tortured plywood'. As we know, plywood (and plate steel a use in origami construction) is really only able to produce 'conic sections'. While steel can be formed into compound curves, plywood normally cannot be twisted into compound curves.

Tortured plywood uses thin layers of plywood, and some framing to force the plywood into mildly compound curves. It was pioneered by the folks doing plywood multihulls, but you see it in other narrow hull forms such as kayaks and in boats with minimal rocker such as high performance skiffs.

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post #1276 of 5317 Old 09-27-2013
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Re: Pros and cons of steel sailboats

Nice kayak MC. Too bad you don't have a nice place to paddle it.
Bears and bugs.
I'd like to fish that lake.

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post #1277 of 5317 Old 09-27-2013
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Re: Pros and cons of steel sailboats

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Originally Posted by outbound View Post
Sorry for the poor expression. Think in forming the hull the way origami is done complex curves are produced. Think with other construction techniques reproducing the simple or complex curvatures would be more easily done. Would think one could mold off the mirror image from the opposite undamaged side but is still left with the problem of shaping. Wondering how repairs to plate are done to origami or other frameless construction. Steel stretches when dented. For a segment big enough to want to fix or an area where plate thickness has been thinned due to rust you seem to have problem. How is this dealt with ?
Lots of longitudinals across the affected area and well beyond, will keep it fair while doing repairs. You can even use temporary longiitudinals on the outside , removing them after final welding is done.

Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"
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post #1278 of 5317 Old 09-27-2013
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Re: Pros and cons of steel sailboats

"Fair" can be very subjective.

This shot of the stern of my FRANCIS LEE is what I consider fair.
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Giant Stern Shot.jpg   pain 9-25-4.jpg  

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Re: Pros and cons of steel sailboats

Brent please exbound. Give us a step by step. Don't understand.


Bob that's truly fair.

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Re: Pros and cons of steel sailboats

Out:
I have a well tuned eye and "fair" to me as an "absolute", objective description. Not subjective. I always try to be fair.

I understood what Brent said and it made perfect sense. I won't try to explain it. That's Brent's job. But I can see how it would work.

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