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post #791 of 1155 Old 06-26-2013
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Re: Bob Perry's take on Wolfenzee's dream boat

Jeff,

That makes a lot of sense from an engineering perspective ( I am one...).

The interesting thing is that a lot of high latitude sailors seem to favor steel or aluminum, why is that ? iced in situation potential of crushing hull?

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post #792 of 1155 Old 06-26-2013
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Re: Bob Perry's take on Wolfenzee's dream boat

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Perhaps people get a bit careless sailing my boats, because they know they can survive such colisions, while others would probably break up and never be seen again. Are you suggesting I make them flimsier, so the stories disappear along with the boats, in a similar fashion?
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post #793 of 1155 Old 06-26-2013
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Re: Bob Perry's take on Wolfenzee's dream boat

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Originally Posted by jorgenl View Post
Jeff,

That makes a lot of sense from an engineering perspective ( I am one...).

The interesting thing is that a lot of high latitude sailors seem to favor steel or aluminum, why is that ? iced in situation potential of crushing hull?
One word - toughness.
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post #794 of 1155 Old 06-26-2013 Thread Starter
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Re: Bob Perry's take on Wolfenzee's dream boat

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Originally Posted by jorgenl View Post
Jeff,

That makes a lot of sense from an engineering perspective ( I am one...).

The interesting thing is that a lot of high latitude sailors seem to favor steel or aluminum, why is that ? iced in situation potential of crushing hull?
Thank you for the supportive comment. I am not sure why high latitude sailors would prefer aluminum, but steel does have advantages in that application such as its high abrasion resistance and the ability to make repairs even in a cold climate.

You can achieve better impact resistance with a kevlar-vinylester laminate, and a pretty high abrasion resistance, but if you breech the skin, I am not sure how you would make a reliable repair without heating the area up to a temperature in the 40F range.

The other thing is that many of the high latitude boats are pretty big boats. At some point as boats get bigger (probably something in excess of 40 or so feet), steel's higher unit strength does come into play and steel begins to become a more competitive choice.

Jeff


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Re: Bob Perry's take on Wolfenzee's dream boat

Hart:
Great video.
What is the green double ender?

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Re: Bob Perry's take on Wolfenzee's dream boat

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Hart:
Great video.
What is the green double ender?
The green double-ender looks like a Tumlaren. There appeared to be at least 4 of them in the race. There was also a sdouble ender which appeared to be smaller than the Tumlarens and may be a Goteborg Flyer. Now how these uniqulely Scandinavian designs got to Australia is beyond me.

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post #797 of 1155 Old 06-26-2013
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Re: Bob Perry's take on Wolfenzee's dream boat

As unlikley as is might be (actually the chances are down right astronomical) I located a used racing mainsail that will fit my boat with no alterations (Sobstad Genesis Platinum laminate Mylar/taffeta etc) , it's loose footed, but that's not a problem and might even be a good thing. It has minor issue with the leech which can be fixed with a reinforcing leech tape (which is a good thing to have anyway), but over all is in good shape and a really good price, it will give me the chance to try out a laminated sail with out investing a lot of money (and it gives me a chance to save up enough to have a new sail cut)
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Re: Bob Perry's take on Wolfenzee's dream boat

Wolf,
Do you know what kind of boat that the sail is from. Your boat has a lot of mast bend, and so you will want a sail cut for a boat with similar 'pre-bend' or the sail will be too flat for your boat.

Also mylar/polyester taffeta sails are very short lived sails compared to other laminates.


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Re: Bob Perry's take on Wolfenzee's dream boat

Jeff:
Yes, I thought they looked like Tumlarens as well. Love that boat.

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Re: Bob Perry's take on Wolfenzee's dream boat

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Jeff:
Yes, I thought they looked like Tumlarens as well. Love that boat.
Me too. Truly beautiful boats.

I have also liked some of their construction details like the planked down hull to their plank keel, especially as this was combined with their bronze or iron floor timbers extending far up thier topsides. That has always struck me as strong, light and maintainable.

At least some Tumlarens were copper riveted either into double planking or carvel.

The one that I knew best had a mix of sawn and steam bent frames. I always suspected that she was skip planked over the sawn frames and then the bent frames were bent to the planking. Of course, that is only speculation on my part, but its a nice way to build a boat.

Jeff


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