Forum: SparTalk
04-27-2015, 10:27 PM
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Replies: 11
Views: 8,626
Ti vs bronze?
What advantages does Ti have over bronze for most chainplate applications?
It is lighter of course, but for 99.9% of boats the difference can't be significant down low.
It is shiny and stays that...
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Forum: SparTalk
08-10-2012, 02:51 PM
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Replies: 5
Views: 12,968
Why not?
C954 Bronze has similar numbers to stainless:
Tensile 85,000
Yield 32,000
It's cheaper than Ti, (3/8" x 2" x 26" flat for $56);
Lasts indefinitely in the marine environment (even...
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Forum: SparTalk
08-09-2012, 10:54 AM
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Replies: 6
Views: 7,808
More info...
The Vizzion that failed was 3/8", which compares reasonably well with the 9mm Spectra that is the boat designers spec. So I don't think it is a simple undersize issue.
I find it hard NOT to blame...
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Forum: SparTalk
07-06-2012, 11:36 AM
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Replies: 6
Views: 7,808
Halyard Failure
Looking for thoughts on preventative maintenance for high tech halyards.
A bit of background. The boat is a J-105 in day charter service on San Francisco Bay. Used a lot (4+ days per week) and...
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Forum: SparTalk
10-10-2008, 01:12 AM
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Replies: 5
Views: 5,885
Old hulls getting "brittle" doesn't...
Old hulls getting "brittle" doesn't make a lot of sense. If you have ever seen cured raw,
unre-enforced polyester or epoxy resin it is VERY brittle right from the get-go. It is only the glass...
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Forum: SparTalk
08-15-2008, 07:38 PM
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Replies: 5
Views: 6,640
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Forum: SparTalk
07-29-2008, 10:57 AM
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Replies: 5
Views: 6,640
Brian,
Certainly Lynx is just an example of a...
Brian,
Certainly Lynx is just an example of a type. The America of America's Cup fame would be another classic example.
All of those are answers we discussed, but none of them were found to be...
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Forum: SparTalk
07-26-2008, 11:02 PM
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Replies: 5
Views: 6,640
Extreme mast rake in old schooner designs...
At the sailing school I teach at a group of instructors were discussing traditional boats when this particular old American schooner design came up: http://www.privateerlynx.org/
There were many...
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Forum: SparTalk
07-12-2008, 07:59 PM
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Replies: 9
Views: 14,987
Dan,
I can't answer your questions, but maybe...
Dan,
I can't answer your questions, but maybe you can answer one of mine...
Years ago I tried to find out WHY my ketch had an insulator in the triatic stay. I got all kinds of crazy answers,...
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Forum: SparTalk
06-22-2008, 08:57 AM
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Replies: 2
Views: 5,605
As a sailor, not a rigger, I can't comment on...
As a sailor, not a rigger, I can't comment on your first two questions, but I do feel qualified to comment on the reefing system.
My comment: Like Brian Said.
At work I sail a number of boats...
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Forum: SparTalk
06-13-2008, 09:48 PM
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Replies: 5
Views: 4,452
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Forum: SparTalk
06-13-2008, 09:27 PM
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Replies: 4
Views: 3,861
I gather this is required by some of the racing...
I gather this is required by some of the racing rules, but under what conditions would it be a benefit?
Seems to me if the mast was far enough out of column to jump out of the step, you would have...
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Forum: SparTalk
06-02-2008, 07:35 PM
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Replies: 9
Views: 8,031
Another option for clean lines...
Some of the chainplates on my boat are mounted with what are essentailly flat head machine screws in a countersink. What makes them unusual is that the head has an undercut on the taper, making for...
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Forum: SparTalk
07-11-2006, 08:36 PM
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Replies: 5
Views: 6,008
Asymetrical Spinnaker running rigging
Bob,
Actually the spools are appealing. The "hard parts" are very lightweight and are pretty well covered in soft rope when in use! I was more trying to justify not embracing the "typical"...
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Forum: SparTalk
07-11-2006, 01:58 PM
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Replies: 5
Views: 6,008
Asymetrical Spinnaker running rigging
Thanks Bob,
I know under most conditions people don't think of the metal snap shackles being as nasty on a spinnaker as they are on a flapping jib, but I know that as I pull the sock down to douse...
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Forum: SparTalk
07-10-2006, 09:15 AM
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Replies: 5
Views: 6,008
Asymetrical Spinnaker running rigging
I thought I had found the perfect solution in the rigging of my spinnaker, and in fact it is easy to rig and works well.
What I do: The clew of the spinnaker has a short line spliced it it, and...
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Forum: SparTalk
06-26-2006, 10:15 AM
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Replies: 6
Views: 4,985
Michel,
A "tapered" mast is smaller in...
Michel,
A "tapered" mast is smaller in diameter at the top then at the bottom. Reducing weight to the top of the mast can help with performence a great deal.
Typically this is done by taking a...
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Forum: SparTalk
04-17-2006, 09:32 AM
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Replies: 2
Views: 5,187
Continuous loop...
I am sure this has been discussed before, but darned if I can find it, so forgive me if I repeat something previously answered...
I am adding a two-speed (4:1/8:1) mainsheet to my 40' ketch, most...
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Forum: SparTalk
12-12-2005, 07:13 PM
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Replies: 9
Views: 6,164
My head hurts!
Gee, I thought I was asking a simple question! NowI know the reason that I became a chemical engineer instead of an electrical engineer!
Let's see if I have understood the things discussed.
With...
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Forum: SparTalk
12-05-2005, 11:10 AM
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Replies: 9
Views: 6,164
Ketch SSB antenna ideas
An interesting idea, Russ. Especially since I already have the wire topping lift for the mizzen in place. I am not sure that I like the idea of running the antenna lead out the mizzen boom,...
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Forum: SparTalk
12-02-2005, 10:32 AM
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Replies: 9
Views: 6,164
Spring Stay Puzzle
When I first purchased my ketch the spring stay was installed with a single insulator more or less half way between the main and mizzen masts. Obviously not to use the wire as an antenna, no radio...
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Forum: SparTalk
08-16-2005, 09:17 AM
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Replies: 1
Views: 4,382
Old SS Fasteners.
With the rig out of the boat this week, it is getting a good going over and I am trying to get everything as fixed as I can in the yard time I have available. Of course there are always old problems...
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Forum: SparTalk
08-12-2005, 07:53 AM
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Replies: 5
Views: 5,695
2 holes and a hook...
Bob,
I don't know where I learned this, so I can't give credit where it is due. Here it is in my own version. certainly not as clear as if written by Brion, but clear enough to follow, I hope.
1.)...
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Forum: SparTalk
08-11-2005, 11:46 AM
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Replies: 5
Views: 5,695
2 holes and a hook
Thanks Brion.
That 2 holes and a hook approach is exactly the one that I had intended on using. In fact on the mizzen mast I'll be using the same holes that the cable clamps for the external...
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Forum: SparTalk
08-11-2005, 08:48 AM
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Replies: 5
Views: 5,695
Rivets: Aluminum or Stainless?
I have the opportunity to install conduit in my mast and finally silence the banging of the wires. :) After careful consideration of many options, my plan is to rivet plastic conduit to the mast...
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